{keyword}' And (select Chr(100)||chr(85)||chr(102)||chr(83) From Sysibm.sysdummy1)=chr(100)||chr(85)||chr(102)||chr(83) And 'ikjv'='ikjv -

This specific payload is likely a test.

CHR(100)||CHR(85)||CHR(102)||CHR(83) translates to the string "dUfS" .The code asks the database: "Does dUfS equal dUfS?" Since this is always true, the database will process the request without an error.

The attacker is attempting to "trick" the database into running a command that was never intended by the website's developers.

If you are a developer, seeing this in your logs means someone is scanning your site for holes. You can stop these attacks by using (Prepared Statements). This ensures the database treats input as "just text" rather than executable code, rendering the single quotes and CHR commands harmless.