Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1bbebfe660d811f…

MALICIOUS

PDF

76.1 KB Created: 2021-06-06 16:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fdb1c6f4362d1a0963eb5dbc6070bf4 SHA-1: 2048771df0d43341d282389e8f7686a3f3ddc969 SHA-256: a1bbebfe660d811f6cd3c107abfcb917ae98b4c0a57e5bb1a7a77bc1dcb7cb3f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains text related to sending a "fake blocked message", reinforcing the phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9597

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://laborke.ru/pbw?utm_term=how+to+send+a+fake+blocked+message
    • https://welukixavise.weebly.com/uploads/1/3/1/0/131069839/pilumepagibuw.pdf
    • https://velawavasikene.weebly.com/uploads/1/3/5/4/135400921/genaterubefitaj_bukidujadowu_vuwoside.pdf
    • https://cdn-cms.f-static.net/uploads/4375075/normal_60680ddb720cb.pdf
    • https://baxemazone.weebly.com/uploads/1/3/0/7/130739829/396875.pdf
    • https://dibosowosobon.weebly.com/uploads/1/3/7/5/137511826/burof.pdf
    • https://cdn-cms.f-static.net/uploads/4409093/normal_6052fe8b4a74b.pdf
    • https://nevajuto.weebly.com/uploads/1/3/2/6/132695651/ketuxuwe.pdf
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    • https://nusavudusegi.weebly.com/uploads/1/3/4/4/134444144/xakaf.pdf
    • https://doxeraja.weebly.com/uploads/1/3/1/8/131871607/megaxaroj.pdf
    • http://godekazonigi.pbworks.com/f/minecraft_pocket_edition_for_pc_windows_7.pdf
    • http://fevawigo.pbworks.com/f/inventory_management_techniques.pdf
    • https://uploads.strikinglycdn.com/files/3860cf43-d0b9-480d-8f95-8123a1e1daeb/5802272330.pdf
    • http://midevodimu.pbworks.com/w/file/fetch/144631599/punjab_bar_council_fee_challan_form.pdf
    • https://uploads.strikinglycdn.com/files/8eb070b0-d6f5-4980-9749-8070e9188789/99105261429.pdf
    • http://xosufixemuf.pbworks.com/w/file/fetch/144672381/62573591416.pdf
    • http://jalosozamiz.pbworks.com/w/file/fetch/144723777/57656084674.pdf