疑わしい
That advertisement looks suspicious to me.
私はその広告が疑わしいです
That advertisement from a few days ago looks suspicious to me.
私は数日前にその広告が疑わしいです
That advertisement I saw online a few days ago looks suspicious to me.
私は数日前にインターネットで見たその広告が疑わしいです
That advertisement I saw online a few days ago, with the company name printed unclearly, looks suspicious to me.
私は数日前にインターネットで見た会社名が不鮮明に書かれたその広告が疑わしいです
That advertisement I saw online a few days ago, with the company name printed unclearly and the contact details changing again and again, looks suspicious to me.
私は数日前にインターネットで見た会社名が不鮮明に書かれた連絡先が何度も変わるその広告が疑わしいです