Spam e-mail from Apple

Hello,

I have recently received an e-mail from “Apple” where they were saying someone purchased something from my apple account and there was an attachment. I haven’t thought twice and I opened it. I was on my phone when I did that. After a few searches on google, now I have all the reasons to believe that was a spam e-mail, and that attachment was a virus. Now I need to ask if whoever sent that to me can broke the access to my informations through my phone, or if is there something I should change/do etc? I have read that apple devices have a strong security and it’s not that easy to take viruses, but I don’t really know anything for sure.