(Adds more details on earnings in paragraphs 4-9)

SAO PAULO, Feb 7 (Reuters) - Brazilian pulp and paper company Klabin reported a fourth-quarter net profit of 370 million reais ($74.55 million) on Wednesday, down 53% on the same period a year earlier.

The company reported a 12% decline in adjusted earnings before interest, tax, depreciation and amortization to 1.68 billion reais.

Analysts polled by LSEG expected Klabin's quarterly net income to hit 612 million reais.

As the company celebrates its 125th anniversary this year, it said in a statement its focus in 2024 "will be the delivery of ongoing projects and the constant search for efficiency".

The drop in results comes despite the company having increased its total sales volume by 4% year-on-year, with pulp sales up 10%. However, paper sales fell by 3% while packaging sales remained stable.

The company's net revenue fell by 11% to 4.5 billion reais in the fourth quarter, pressured by falling prices for Kraftliner paper and pulp on the international markets. The appreciation of the real against the dollar was also a factor, the company said.

Klabin's pulp production cash cost, an important indicator for the sector, was 1.318 reais ($0.265) per metric ton, down 1% on the fourth quarter of 2022 and fairly stable on the third quarter of last year.

"There was a reduction in chemical and fuel costs over the quarter due to lower consumption at the biomass gasification, sulphuric acid and potassium sulphate removal plants, as well as lower commodity prices," the company said.

Investments in the fourth quarter totaled 1 billion reais, down 36% year-on-year and 8% quarter-on-quarter.

($1 = 4.9634 reais) (Reporting by Alberto Alerigi Jr.; Writing by Steven Grattan; Editing by Louise Heavens and Mark Potter)