Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8cf711ab4e0e52…

MALICIOUS

PDF

67.6 KB Created: 2021-02-22 12:24:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 494de90cdc496607a4f6358813c358b5 SHA-1: 2885cfdee50c1738ed2b3117c7bbc463af89dc3e SHA-256: de8cf711ab4e0e52c01962eb341f33d9f1c1d27ff2a992936d9a3b608b3205f7
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. ClamAV detected this as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The document body's content, combined with the embedded links, indicates a lure to trick users into visiting potentially harmful websites.

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/wix?keyword=2005+audi+a4+cabriolet+owners+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4530429/normal_5fe963e731a3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407733/normal_600274989fe4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391008/normal_5fd03e3906c34.pdfIn PDF document text
    • https://cdn.sqhk.co/finelega/YeQTidg/best_deal_on_ninja_foodi_grill_pro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467005/normal_5fd63b8d18c0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393033/normal_601e152ecb32c.pdfIn PDF document text
    • https://rigivopamakor.weebly.com/uploads/1/3/4/8/134869382/kutaw.pdfIn PDF document text
    • https://cdn.sqhk.co/kitatoze/dgjigjd/electric_guitar_parts_names.pdfIn PDF document text
    • https://xedasijaw.weebly.com/uploads/1/3/1/4/131453620/2a9850.pdfIn PDF document text
    • https://kemipopebu.weebly.com/uploads/1/3/4/5/134585234/pinaxujoxiwebu-xidegedopezuli-vivexixizax.pdfIn PDF document text
    • https://cdn.sqhk.co/tanusulirava/je5xhEi/15652744561.pdfIn PDF document text
    • https://jidakizunulub.weebly.com/uploads/1/3/1/3/131381167/kafebijaxu_nujobuligoxa_tukive_bufoforepale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://veridipu.rf.gd/avery_label_templates_for_word_l7165.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_off0000ca53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA53 5924 bytes
SHA-256: ff611953e9530d34e41ca796003524d7761cd876042975edc9b71b9417621daf
font_01_sfnt_off0000de79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE79 10240 bytes
SHA-256: dbb1b9974570fb3ddf918e6630ce925189978a3a221fbc2ec459fda2210ccf4f

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