Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f50392877aec90e…

MALICIOUS

PDF

66.3 KB Created: 2020-12-21 13:20:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 108739bab74602f0c918130d2552160e SHA-1: cff89241212c1e5d44c3eb5dc0e4d33e9949800f SHA-256: 2f50392877aec90ea9783c96f4692aa9f1ecc49a3407dcbe0510a46d29b8a8dd
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites, including 'traffine.ru'. The presence of multiple disposable hosting domains and a high number of outbound links suggests a phishing or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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
  • 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://traffine.ru/strik?utm_term=among+us+wallpaper+iphone+aesthetic
    • https://sexozorojupur.weebly.com/uploads/1/3/4/3/134390270/5562806.pdf
    • https://cdn-cms.f-static.net/uploads/4410191/normal_5fd18a57c45f0.pdf
    • https://viwosakizipisot.weebly.com/uploads/1/3/5/3/135321869/12aa96a.pdf
    • https://tajekuludukomas.weebly.com/uploads/1/3/4/4/134498487/jiganixa.pdf
    • https://wutowenejeboz.weebly.com/uploads/1/3/4/5/134599911/8500378.pdf
    • https://fofexajadovobu.weebly.com/uploads/1/3/4/7/134711713/begafemibe.pdf
    • https://luxovifawus.weebly.com/uploads/1/3/4/3/134341193/baxaniv_vodisopasuri_vawafa.pdf
    • https://bunogijadijis.weebly.com/uploads/1/3/4/8/134896562/403772.pdf
    • https://wuxepufoz.weebly.com/uploads/1/3/4/3/134371519/tabob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rabewiruzitewa/diabetes_guidelines_2019_algorithm.pdf
    • https://uploads.strikinglycdn.com/files/98977592-9db9-4ec5-8429-f1ef4caae74f/48827046170.pdf
    • https://s3.amazonaws.com/joterige/56131993579.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_off0000c4e8.bin
a5e9d6a7b21da09b8dc886232b90ac87c380f10cf9778834acf9fb82a3bde5b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E8 5428 bytes
font_01_sfnt_off0000d747.bin
74c6481c75bed4a5b4f75b9eda93c5c22247de03da111b824edf155183398c54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD747 11012 bytes

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