Norton is telling you that the bad page is trying to insert a virus into your system - presumably it's blocking it (as it should) - that's why you can't detect it when you run a scan - Norton is stopping it before it can get into your susyem.
Best phone camera 2017
Stunning new film posters by Hattie Stewart, Joe Cruz & more
iPad Pro 10.5in (2017) review
28 astuces pour profiter au mieux de votre iPhone