Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa719376cfe377d…

MALICIOUS

PDF

75.1 KB Created: 2021-05-23 07:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1d03c79f31d2bdd3b20a2da7878fae1 SHA-1: bc4208141c923443464c9a572ee1540830bc13ee SHA-256: 6fa719376cfe377d6868d54c5517b13787f549c19985746f8bb76ee3a8639088
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on various platforms, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wb?keyword=creative%20self%20portrait%20ideas%20drawing
    • https://rixatesar.weebly.com/uploads/1/3/1/8/131871899/bd9b9834b268f.pdf
    • https://cdn-cms.f-static.net/uploads/4501996/normal_60673e46c8ec4.pdf
    • https://cdn-cms.f-static.net/uploads/4479460/normal_601baeb64078b.pdf
    • https://fokokawozele.weebly.com/uploads/1/3/4/8/134888355/lonasosevodixe.pdf
    • https://konilusikiwi.weebly.com/uploads/1/3/3/9/133986353/rubowezet.pdf
    • https://nasorigabewa.weebly.com/uploads/1/3/4/5/134519214/jonosedi-toxasijimi-pebovatikomix-rudoged.pdf
    • https://jopuxokoxi.weebly.com/uploads/1/3/4/3/134350500/zadufipozi-badabisenazax-filunaw-bojelasipudivo.pdf
    • https://cdn-cms.f-static.net/uploads/4482625/normal_6028a83171495.pdf
    • https://xawavefite.weebly.com/uploads/1/3/4/6/134667803/wazexeburibozo.pdf
    • https://cdn-cms.f-static.net/uploads/4451018/normal_600de5d134b46.pdf
    • https://cdn-cms.f-static.net/uploads/4376357/normal_6027ed84d661a.pdf
    • https://cdn-cms.f-static.net/uploads/4369768/normal_5fd0a48834d80.pdf
    • https://bujasosepamus.weebly.com/uploads/1/3/4/6/134626994/mowunuzugumesewop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/349877b8-0770-4b82-8d04-0e0842c22fa6/vitivenajenebugemino.pdf
    • https://uploads.strikinglycdn.com/files/d6f676f9-fe93-4419-933d-9ce49a376674/49365120448.pdf
    • https://s3.amazonaws.com/visagogijulep/98014714544.pdf
    • https://s3.amazonaws.com/kegubinefuda/andrew_wommack_ministry_australia.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_off0000e685.bin
965d5b96f9759631c3ddb59d50585fadb2ea9b62e5a11e9a634a2a84a676f460		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE685 5264 bytes
font_01_sfnt_off0000f893.bin
198bc2b27d3f11a9c5c33490ed1a38541220e158f758a3dc7e2e2d3d92e5c9e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF893 10820 bytes

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