Dear @ravi prakash, thank you for asking a question.

SCP is used to copy file(s) between servers in secure way. The most recommended approach to use EC2 instances via GUI mode is via pem files only.

To answer your question, yes it is possible from reference here :
https://www.quora.com/Is-it-possible-to-access-AWS-EC2-for-instance-without-a-pem

But understand, this is most vulnerable to hacks.