Malicious PDF — malware analysis report

Static analysis result for SHA-256 1efc0a44aef688fe…

MALICIOUS

PDF

47.3 KB Created: 2021-02-24 00:16:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8b83d49c7029faa11fad1163e1fbd5b2 SHA-1: 0f16c82927c146763a55a83f9df4592e753bd965 SHA-256: 1efc0a44aef688fe14d8ee6e3b20b4ff091ca3a62f3e72dae23a879f893ea686
152 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/123?utm_term=english+speaking+course+online+free+video+in+hindi'. The ML classifier also flagged the document with high confidence. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs suggest an attempt to redirect the user to a malicious site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9327

Heuristics 3

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/123?utm_term=english+speaking+course+online+free+video+in+hindi In PDF document text
    • https://static.s123-cdn-static.com/uploads/4484993/normal_5fc947b1aab58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417216/normal_5ff77a2060991.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418567/normal_60218a3d34f21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497109/normal_5fd27143ca715.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494681/normal_600a3e8c46f93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418574/normal_602ea94876828.pdfIn PDF document text
    • https://cdn.sqhk.co/novigigexuxo/xhggerE/18263346740.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414339/normal_6031977e5238f.pdfIn PDF document text
    • https://cdn.sqhk.co/gubogezemazo/ieLiglV/rajobilavuwadaweregenonaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420430/normal_5fd19c5dce20f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443801/normal_60161c4e0d76e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382418/normal_6015759f0fc2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498992/normal_6018e89169eb4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383565/normal_5fc7e0d26e61e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448558/normal_5fd85cf01f0f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375356/normal_5ffa34a643ef9.pdfIn PDF document text
    • http://dupenodigilezex.rf.gd/84355124173.pdfIn PDF document text

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