Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c9a1601228df16…

MALICIOUS

PDF

70.2 KB Created: 2020-12-06 04:42:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: b9934a105b025fa7d97ba0996e0db625 SHA-1: ecb6c98caf2a84761dc84e6ce6b7783aef910cf4 SHA-256: 77c9a1601228df1630363e6cbad795a7657d7cc25ca4158b362e163d999c010d
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be related to 'bsf john lesson 11 day 2', likely a pretext to direct users to malicious sites like 'trafftec.ru'. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution attempt.

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://trafftec.ru/123?utm_term=bsf+john+lesson+11+day+2 PDF link annotation
    • https://towimoni.weebly.com/uploads/1/3/4/3/134340956/a5a88a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_5f8f4c51495bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463785/normal_5fbf4fc8f180a.pdfIn PDF document text
    • https://gabexilo.weebly.com/uploads/1/3/4/1/134109250/1840543.pdfIn PDF document text
    • https://zitidatuviwe.weebly.com/uploads/1/3/4/4/134493200/940d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472475/normal_5fc922d356b3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415322/normal_5fae0446706af.pdfIn PDF document text
    • https://foduxami.weebly.com/uploads/1/3/4/4/134452333/5405197.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419642/normal_5fb46af7582b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc7922dd743eb434449f2aa/t/5fc831ee4b97230d0503e825/1606955504300/84417271589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4852587c-f84b-4f51-9011-1df7ca185b15/97173050190.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_off0000d826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD826 5312 bytes
SHA-256: 8786d717a2725a5d2e0bcfd65176cb57217cd63556b6bf37d588243720fd1243
font_01_sfnt_off0000ea50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA50 9956 bytes
SHA-256: 99d96099a450451156aa16b9cdb2a28eac293268428347b1ce3eaa131f208e3d

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