Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3318369d94eb3c…

MALICIOUS

PDF

105.9 KB Created: 2021-06-12 05:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 577698b488c8bed669ac305609bb8926 SHA-1: 936b44c3faaf6da2f9012b88f9c01664278b1352 SHA-256: 3c3318369d94eb3c4a3755543c086c3ec9d49fab2a1c23a686b60c4021bca7ce
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to PDF files hosted on link farm sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crewmak.ru/pbw?utm_term=yellow+oza+medicine+practical+book+pdf
    • https://kawuloxegulul.weebly.com/uploads/1/3/4/3/134389306/5426715.pdf
    • https://static.s123-cdn-static.com/uploads/4458124/normal_5fe2bf36491d4.pdf
    • https://static.s123-cdn-static.com/uploads/4470689/normal_5fddc3ab5cacc.pdf
    • https://pirusamu.weebly.com/uploads/1/3/1/3/131383726/0cca657a94d6e.pdf
    • https://tevosomevovek.weebly.com/uploads/1/3/4/6/134697335/nunejesadar_xemukewenawuma_sifiwofajo.pdf
    • https://gexumuvebevo.weebly.com/uploads/1/3/4/3/134312536/gulezi.pdf
    • https://static.s123-cdn-static.com/uploads/4463298/normal_6003fad75084d.pdf
    • https://sufojise.weebly.com/uploads/1/3/0/7/130739234/1071429.pdf
    • https://ruxuxosiforedop.weebly.com/uploads/1/3/4/4/134491380/78ef59.pdf
    • https://cdn-cms.f-static.net/uploads/4393346/normal_6037e6697d0be.pdf
    • https://static.s123-cdn-static.com/uploads/4366339/normal_5fdd443121b80.pdf
    • https://naguruzitu.weebly.com/uploads/1/3/4/3/134369267/1625350.pdf
    • https://vilotirupoj.weebly.com/uploads/1/3/5/3/135328316/tanajudatisadul-maxusewuvuwuki-fojevi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ronakiko.pbworks.com/w/file/fetch/144537822/zanajemesudamufojukeriv.pdf
    • http://gupiguna.pbworks.com/w/file/fetch/144554478/tekomalorer.pdf
    • http://safubudesowi.pbworks.com/f/sound_blaster_transformers_g1.pdf
    • http://tulusozofel.pbworks.com/w/file/fetch/144949305/24648261147.pdf
    • http://gipomebepate.pbworks.com/w/file/fetch/144812016/differentiating_instruction_in_the_regular_classroom_how_to_reach_and_teach_all_learners.pdf
    • http://wawexigore.pbworks.com/w/file/fetch/144886818/tuneup_utilities_2021_full_version_free_download.pdf
    • 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_off00016035.bin
e46ba7b83b5243fa28f18108ebeac54cfc1e308489b252ee30076a23edb674ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16035 5432 bytes
font_01_sfnt_off000172b0.bin
990cfa531a2dd80fa883bb0b2f330e7a0385c6cc11a24a1607eb34cd8c0277d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x172B0 11300 bytes

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