How to remove ukash virus blocking safari browser on my Iphone 5s?

Hi

I've got a ukash pishing message in my safari browser anytime I click on a page which blocks it's usage.

I still can use others applications.

Do you know how I can safely remove this virus?

Just a remark, I have not synchronized my Iphone with Itunes since quite long, so I also wonder whether I should or not do any new synchronization before doing any action?

Thanks in advance for any help and support.