Kerala are still trailing Jharkhand by 158 runs with only five wickets remaining.
Resuming on 246 for six, overnight batsman Kaushal Singh, who was unbeaten on 21, went on to score a 92-ball 53 studded with six fours.
Although, new batsman Shahbaz Nadeem (0) got out in the second ball of the day, Kaushal joined hands with Rituraj Singh (39) to put on 45 runs for the eighth wicket.
In reply, Kerala kept on losing wickets at regular interval to be struggling at the close of play.
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Sanju Samson was the lone batsman to have put up some resistance with a solid 89 off 176 balls that included 12 boundaries and a six.
At stumps, Rohan Prem was batting on 35 and Raiphi Gomez was on three.
Brief scores:
Jharkhand 1st innings: 337 all out (Virat Singh 100, Kaushal Singh 53; Rohan Prem 3/45).