Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d861c0d8bead8a…

MALICIOUS

PDF

63.5 KB Created: 2021-02-17 10:41:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5b2752ec192abb4187f84e535ffcb3e5 SHA-1: b742117eabd4cbf2060d8b9b5b26dc2dbe6f2be4 SHA-256: c8d861c0d8bead8a51245276600a199e3087c916a3e6631a0ba0cbc64332479c
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, indicating a high likelihood of malicious intent. It contains numerous external links, including one to 'seumenha.ru', suggesting it is designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a link farm hosted on disposable domains, a common tactic for phishing or malware distribution. No scripts were extracted, but the presence of multiple external links points towards an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wix?keyword=infinite+algebra+1+one+step+equations+answers PDF link annotation
    • https://wudizabilizone.weebly.com/uploads/1/3/4/7/134745746/seniwu.pdfIn PDF document text
    • https://jolidezebixisu.weebly.com/uploads/1/3/3/9/133997790/jabexe.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwoxebu/1h1x4ih/halo_top_ice_cream_vanilla_bean_nutrition.pdfIn PDF document text
    • https://xuxufagitagagi.weebly.com/uploads/1/3/0/7/130740521/166695.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471512/normal_601d6ad448fc9.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxevabuvix/GgeGiaj/9394634613.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421639/normal_600f9e20b5b1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425737/normal_5ff91ef1167a7.pdfIn PDF document text
    • https://jevokave.weebly.com/uploads/1/3/4/2/134266272/6323855.pdfIn PDF document text
    • https://cdn.sqhk.co/ravuviwidi/ghdjfhg/latagazovibekudexugu.pdfIn PDF document text
    • http://vuvuga.xyz/lixegizd1htj.pdfIn PDF document text
    • http://arendagg.xyz/76729570744ks0kn.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/lonozote/mekixomaridukajilipot.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/uruvam_tamil_horror_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/nirvana_gtd_setup_guide.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_off0000bd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD40 5416 bytes
SHA-256: 22e8a6bbbbefaad62cc4f081e301c5067f1b2c8f53e005811b5cb92ed306d069
font_01_sfnt_off0000cfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD3 9680 bytes
SHA-256: 703134f5f98dbc11bc1dda806be3757237b597e1c9786a239e7eb3e25d36e7df

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