After a bit of digging, one is using a neural network, so a false positive on it's pattern matching.
SecureAge APEX - Malicious
I submitted shark.dll as a false positive to https://www.secureaplus.com/features/antivirus/report-false-positive/

The second one is surprise surprise also machine learning (neural network) based, so a false positive on it's pattern matching.
BitDefenderTheta - Gen:NN.ZedlaF.34254.uy4@amMEQZki
I submitted shark.dll as a false positive to https://www.bitdefender.com/submit/

The third one is also an Artificial Intelligence Antivirus (it is a neural network), yet another false positive on it's pattern matching.
Bkav - W32.AIDetectVM.malware2
They do not appear to have a way to submit false positives, which is not a good sign.