Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c3ffefd31eb26c…

MALICIOUS

PDF

73.0 KB Created: 2020-12-15 12:42:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ae3ee6fe79d9fd22e135bb8733b0e004 SHA-1: 53a04dbca8ba58c60b2ddf29d92a12e187190a38 SHA-256: 77c3ffefd31eb26c9f488e5ca5a9b5974d24018098dada0d75da019b3e8eb772
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one pointing to a suspicious domain ('trafficel.ru') that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, further suggesting malicious intent. Although no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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/strik?utm_term=warn+winch+wiring+diagram+solenoid PDF link annotation
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/roruj-fegedevovelere-zexomojikazi-rewubujelem.pdfIn PDF document text
    • https://nutolaje.weebly.com/uploads/1/3/4/5/134596366/3523612.pdfIn PDF document text
    • https://rofexigu.weebly.com/uploads/1/3/0/7/130738805/zakawosemut.pdfIn PDF document text
    • https://mexobuvuxe.weebly.com/uploads/1/3/4/3/134369937/3b829c30eb533.pdfIn PDF document text
    • https://jinugavov.weebly.com/uploads/1/3/4/4/134438703/dujujabubet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370542/normal_5f9a08f5d1fe8.pdfIn PDF document text
    • https://xalitizamer.weebly.com/uploads/1/3/4/8/134863297/sukewedezo.pdfIn PDF document text
    • https://babinekisifuve.weebly.com/uploads/1/3/2/6/132696104/merenefuwenetodemin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493195/normal_5fbf52c27b46f.pdfIn PDF document text
    • https://devigumekumowir.weebly.com/uploads/1/3/4/3/134394761/rurar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wifozuxeku/black_and_decker_cm2020b_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9ece97f-5f5c-47cd-846e-0b1085c083f2/rigododuw.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF65 5460 bytes
SHA-256: 28b6f3daa41174fe5d84199ff3a0dff5c92a3447a73ed838f702a41e86775336
font_01_sfnt_off0000f1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 11020 bytes
SHA-256: f9aa08a96cc6fdd3d9c7edad8a473916aea7de519b67091d79ac38aa1aa4fb1a

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