Malicious PDF — malware analysis report

Static analysis result for SHA-256 8191b56fd8ac8eb3…

MALICIOUS

PDF

77.7 KB Created: 2021-05-30 07:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7dcbe0dc36e9ea2df2d97548ba280d6c SHA-1: f7fedc23eace1b4f3d5878f571d0bed65565bbff SHA-256: 8191b56fd8ac8eb311387a573b158476f22e6a7d6127eb62d1e073898be0ea55
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, suggesting a link farm or redirection mechanism. The primary URL, https://mezovovuduw.ru/wb?keyword=bash%20shell%20scripting%20training, appears to be a lure for users interested in scripting training, likely to deliver a payload or conduct phishing. No scripts were extracted, but the PDF structure and numerous external links point to a distribution or redirection role.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/wb?keyword=bash%20shell%20scripting%20training
    • https://molefagis.weebly.com/uploads/1/3/5/3/135311004/8126415.pdf
    • https://dewotime.weebly.com/uploads/1/3/1/6/131606762/nuzuma-gavow-dunajifinig-gotuzerut.pdf
    • https://static.s123-cdn-static.com/uploads/4391634/normal_5fdda51c54b11.pdf
    • https://cdn-cms.f-static.net/uploads/4480743/normal_605b9f79e3498.pdf
    • https://dojebuxepoviguf.weebly.com/uploads/1/3/1/4/131407435/4558128.pdf
    • https://serataxufo.weebly.com/uploads/1/3/1/6/131606193/7044439.pdf
    • https://kojoridenifuzav.weebly.com/uploads/1/3/1/4/131406931/daxuvarazonuk_kuviworisimoded_duzikezew.pdf
    • https://nuwebobejope.weebly.com/uploads/1/3/1/4/131407692/rapilagife.pdf
    • https://lufuroxula.weebly.com/uploads/1/3/1/4/131408913/viropibaf.pdf
    • https://tagekoworiz.weebly.com/uploads/1/3/4/0/134016686/puravat.pdf
    • https://gatobutapasi.weebly.com/uploads/1/3/4/3/134364099/sejuf_geribuw_puwuxikunaruros.pdf
    • https://cdn-cms.f-static.net/uploads/4414175/normal_605b53a2b3704.pdf
    • https://molawaxurot.weebly.com/uploads/1/3/4/6/134699933/5667324.pdf
    • https://static.s123-cdn-static.com/uploads/4368998/normal_600261382289d.pdf
    • https://cdn-cms.f-static.net/uploads/4448976/normal_6022d88d28e7c.pdf
    • https://static.s123-cdn-static.com/uploads/4402246/normal_5ffe4470dab3e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f76335a0-c5a8-42cb-a930-76da2551f339/download_alight_motion_pro_ios.pdf
    • https://uploads.strikinglycdn.com/files/57809b0b-5ca1-469b-836e-9028407984d9/why_financial_accounting_is_considered_to_be_the_language_of_business.pdf
    • https://uploads.strikinglycdn.com/files/41dfb04a-4136-48b5-9da7-77fe2202deeb/69336720499.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_off0000f00e.bin
375570433d56fbcf0c320adf097eeba1770b7ce05f4741204a0e1f59bebfbc2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF00E 5244 bytes
font_01_sfnt_off000101e0.bin
be5aaa607adb190195c158375cf610cbcac8509a6db530739d6c636cdaf5046d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101E0 11148 bytes

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