Punjab National Bank (PNB) today reported a marginal increase of 3.4 per cent in its net profit for the first quarter of the current fiscal. It quoted its net profit at 1,105 crore rupees. PNB said in a statement that it had registered a net profit of Rs 1,068 crore in the same quarter a year ago.However, the total income of the bank rose by 37 per cent to Rs 9,399 crore during the quarter.