Phising Email PDF or HTML

Hi, I am using iPhone 14 Pro and my last update of iOS was yesterday (ios 16.4.1).

I have accidentally opened an email looks like Agoda. I recently used Agoda to book accommodations, i accidentally opened the pdf as well. Then I realize it is from a weird site. From the pdf name it is of pdf and html (i.e. xx.pdf.html).

I havent clicked into other links and immediately close the app and went clean all my browser data. Also I turned my iphone off and on again.

I read from other discussions saying it is fine as long as i didnt provide my username and password. But i am not sure if it works on my case as well as the pdf might be a html.

Is it safe in this way? Please advise me what else i can do? Thank you.