How can I detect those apps that carries malware and phishing stuff that will be able to steal my seedphrase.
It is usually somehow difficult to identify malware. So, the best approach is to learn basic knowledge on how to protect your device. Malware or phishing attacks come in the form of unfamiliar advertisements, unexpected messages or applications, or enticing offers. It is better to avoid them by not clicking on random links and always confirming the source of any information or app before responding. Social media is not a safe place to get information; it is always better to get it from the verified website of the sender. If you want to keep your funds safe, consider using a hardware wallet or an air-gapped wallet.
Another thing will also help to avoid online attacks that can lead to hack is for you to know what you really want. You don't need to download every app that is related to cryptocurrency and you don't need to go into every crypto site, if you have this understanding it will be difficult for you to fall victim.
For you to have the understanding of what you really want will help to avoid risk and scam that can cause you to lose your asset. Some beginners fall victim of attacks because they do not have the knowledge of what the social media environment is like. Apart from having wallets and cryptocurrency platforms it is very important for one to have knowledge about security and knowledge about how scammers operates to get victims.