Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ec62a71ebacaf3…

MALICIOUS

PDF

72.5 KB Created: 2021-02-21 11:54:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3d1f3ed1a02de015d4483fb8ff24c146 SHA-1: 9fe2bbed2d304728d1ce17cc9c0de32826e5bfa1 SHA-256: a6ec62a71ebacaf31fb2903e218cb0f2b1d7b52d715c45046da6c3d259a2f77b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, suggests a lure related to building a gun cabinet, which is then linked to external sites. The presence of multiple disposable hosting links and UTM parameters indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://seumenha.ru/123?utm_term=how+to+build+your+own+gun+cabinet PDF link annotation
    • https://cdn.sqhk.co/muwazubivotu/jbghOgj/wafonijubetalulavinadujog.pdfIn PDF document text
    • https://cdn.sqhk.co/vafegijateno/hihcvhh/wild_tamer_guide_francais.pdfIn PDF document text
    • http://fortuneo-enligne.com/android_version_update_listkpa2n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448743/normal_5fe6369ae80f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402932/normal_6030879e55bcf.pdfIn PDF document text
    • https://dopapebo.weebly.com/uploads/1/3/4/8/134870178/7411277.pdfIn PDF document text
    • https://kanapefa.weebly.com/uploads/1/3/2/7/132740413/fojofukuwekewas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408702/normal_5ffd742a3a4d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500447/normal_5fdd6ed18931d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502246/normal_5fced527696e8.pdfIn PDF document text
    • https://limifotediko.weebly.com/uploads/1/3/5/3/135325738/vibosoka-ladube-jezavudesusijis-rarixunovigu.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/idgcNig/63832945241.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449014/normal_5fea0082483a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mirovexul.rf.gd/grade_3_math_fraction_worksheets.pdfIn PDF document text
    • http://lugumew.epizy.com/38671389039.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_off0000e09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09A 5224 bytes
SHA-256: 5eea059f91d1e687f09fe9ceda68c670525ef209df22ec6f8ef266034f180de9
font_01_sfnt_off0000f27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27E 10008 bytes
SHA-256: 11630b3308a5dac4e32704e3896b4efffb8292ffc942babf1bf7466cf8d0f458

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