If you are a beginner, it is difficult for you to choose who you trust and therefore the default trust in antivirus programs
I agree with you, but perhaps we need to educate newbies a little bit about this. People think antivirus programs are completely trustworthy, based on nothing. If you believe your anti-virus or you believe your bitcoin wallet is down to trust. Both are being developed by people you (presumably) don't know personally, and don't know if you can trust. The former is likely closed source; the latter should be open source, and in the case of Bitcoin Core, Electrum, or any of the other major wallets, will have had its code widely reviewed. Even if you don't or can't review the code yourself, I'd be picking the latter.
The only malicious part of it is the clipboard hijacker.
The fake 4.0.0 Electrum wasn't a clipboard hijacker. Instead, as soon as you opened it, it would attempt to sweep your wallet to the attacker's address. Anyone who used Electrum stand-alone (as in, not paired with a hardware wallet) had all their coins lost instantly. They didn't need to copy and paste anything for this to happen.