Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a71b184440309e…

MALICIOUS

PDF

69.1 KB Created: 2020-12-17 12:58:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6902a9cc250b41f30d191b0af13d6ba4 SHA-1: 5cf7a9f23192990dc811b23aad70a41df0767c24 SHA-256: 31a71b184440309eb4922d1051302e3cd6ab9788a4cd6861ae94cd6196a3fa9c
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ML classifier and ClamAV detection. It contains a large number of external links pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of numerous external URLs and the 'PDF_SEO_LINK_FARM' heuristic indicate an attempt to redirect users to potentially harmful content or engage in phishing-like activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://trafficel.ru/123?utm_term=denver+recycling+schedule
    • https://zuxuzesis.weebly.com/uploads/1/3/1/4/131438019/f5469e.pdf
    • https://regafuraseni.weebly.com/uploads/1/3/4/6/134663643/mabiwutaputasoruve.pdf
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/ce0296d2f4.pdf
    • https://cdn-cms.f-static.net/uploads/4389604/normal_5f9c27a7132fd.pdf
    • https://sinosawalebito.weebly.com/uploads/1/3/4/6/134663044/jadol-wimipavas-balores.pdf
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/mibojos.pdf
    • https://mawosamaretezij.weebly.com/uploads/1/3/4/8/134860838/lidabuselemesobapoja.pdf
    • https://toripifisesu.weebly.com/uploads/1/3/4/3/134367164/vonobogusezew-tajedijes.pdf
    • https://musazowoxagaw.weebly.com/uploads/1/3/4/3/134323980/9099394.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b2774ee9-f768-45ec-a168-d8b38d92b115/62702285308.pdf
    • https://uploads.strikinglycdn.com/files/915e90cd-5757-4150-89ef-ce90d045c7dd/dokegijaz.pdf
    • https://s3.amazonaws.com/kitakilesa/aquacultural_engineering.pdf
    • https://s3.amazonaws.com/zoromexemuzid/dusomenuzedarawot.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0ab.bin
895fe2a4c2bfa94cfc90a774a8b7b05b5e54727392dc98a6d0d3d72cc24d4e10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AB 5152 bytes
font_01_sfnt_off0000e242.bin
ecca718927a9e75fd5db211504541c6f0d3cadc5ddb886617b1934c54180ed22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE242 11016 bytes

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