Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ed4e0db81920e24…

MALICIOUS

PDF

75.3 KB Created: 2021-04-06 21:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b1cd9f3558086d2cdc739af48dbd8c2 SHA-1: 51c20e9366031133ef48f67b4a007aea499203c4 SHA-256: 7ed4e0db81920e24a06da5fdf8d6b09e4a6701b27a222917637edf3b509bf5de
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body, though partially obfuscated, contains text related to legal matters, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/123?utm_term=amparo+indirecto+en+materia+penal+formato
    • https://static.s123-cdn-static.com/uploads/4460946/normal_5ff938a75ae2b.pdf
    • https://cdn-cms.f-static.net/uploads/4446649/normal_6037a6e5d8b2c.pdf
    • https://cdn-cms.f-static.net/uploads/4447096/normal_6043ed26a9f60.pdf
    • http://uscreditreport.info/328155809bgumy.pdf
    • http://trikolor.site/fizufusibajubotpjj9.pdf
    • https://cdn-cms.f-static.net/uploads/4415962/normal_6009be9f53811.pdf
    • https://static.s123-cdn-static.com/uploads/4414335/normal_5ff2b1e518497.pdf
    • https://cdn.sqhk.co/jexerigix/jehZieO/pink_skater_skirt_amazon.pdf
    • https://cdn-cms.f-static.net/uploads/4453747/normal_600cb63647f2c.pdf
    • https://cdn.sqhk.co/pijovowifil/Hhjgggf/63915889156.pdf
    • https://cdn-cms.f-static.net/uploads/4476436/normal_6045f682a6b7a.pdf
    • http://shortsomfj.space/2006_bmw_330i_oil_quartspw7pj.pdf
    • http://zarabotok.space/boy_scout_logo1kvlq.pdf
    • https://cdn-cms.f-static.net/uploads/4379726/normal_5fd78557cf2cb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_c0ca473a915b4213a869d11e56f06d00.pdf?index=true
    • https://s3.amazonaws.com/banula/tasunozoduzibujabuvalevub.pdf
    • https://s3.amazonaws.com/lebejos/81085352998.pdf
    • https://s3.amazonaws.com/dukexajuj/zijekegafofezemuw.pdf
    • https://s3.amazonaws.com/jivamubug/nier_gestalt_weapons_guide.pdf
    • https://f395d2f2-f939-483b-815f-81062d4747ff.filesusr.com/ugd/be2697_c0cc18f3da9143fc9a078336b12dbd1c.pdf?index=true
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_f11d45a9dd8c4ef99605e0082d75e4ab.pdf?index=true
    • https://s3.amazonaws.com/tirimofufemukat/44850456798.pdf
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_e83a1af7d0484963a6c75d8d55f4aca4.pdf?index=true
    • 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_off0000ea38.bin
86b6b8cf3ad014271d53a06dd38270bc8d9e5cec686fef199c6ad3bfdd1ffad7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA38 5112 bytes
font_01_sfnt_off0000fb8b.bin
8ca5eda4cb5ddec79a3ba6f8aa78c5b8dc3128de2f8aa7e01c1aae6de9d8567b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8B 10980 bytes

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