Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce8544aa02be5ee5…

MALICIOUS

PDF

76.7 KB Created: 2021-04-01 00:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcb3b36fed22e793cf9fc3450ba0619b SHA-1: 12e1a2cb46575e339df4be010f7c3a804fb2954c SHA-256: ce8544aa02be5ee5ea61ace61541d44fc7fe4af984a0a3f7955ff55832d47bd3
146 Risk Score

Malware Insights

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

The PDF document contains numerous external links, with one specifically pointing to 'mezovuduw.ru/award'. Heuristics indicate the PDF is a link farm on disposable hosting, and ClamAV detection flags it as Pdf.Phishing.Trojan. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'online cv maker in pdf format', suggesting a lure to disguise malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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/award?keyword=online+cv+maker+in+pdf+format
    • http://zinefikitozozeg.sportsontheweb.net/human_anatomy_and_physiology_tenth_edition.pdf
    • https://cdn.sqhk.co/dekavaka/SibHhhy/bloons_tower_defense_5_unblocked_76.pdf
    • http://kigirifaduguv.getenjoyment.net/woodworking_for_dummies.pdf
    • http://shop-profildoors.ru/35779234619rq5ea.pdf
    • https://pozuxopukemo.weebly.com/uploads/1/3/4/7/134705319/94f6a59c3357.pdf
    • https://poxagubojawi.weebly.com/uploads/1/3/1/4/131482812/33db3e00754.pdf
    • http://tumuduwaju.mypressonline.com/rivamofa.pdf
    • http://cheapkeys.site/jorimapuwarojajikie122i.pdf
    • http://ninomut.sportsontheweb.net/giwovipobaxemibi.pdf
    • http://heymama.store/xagexoririnaxajosifife4y9o8.pdf
    • https://jolofoni.weebly.com/uploads/1/3/4/0/134042869/pazesezi_rutuzulitujuv_gonulu_vosomo.pdf
    • https://cdn.sqhk.co/zugeketinog/ghShdja/rugevovenafiwe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bitines.myartsonline.com/xuvegitaxizawanorawovuta.pdf
    • https://s3.amazonaws.com/nosepevozux/fefugivas.pdf
    • https://s3.amazonaws.com/tufujifinobiro/samsung_55_inch_qe55ls01tauxxu_the_serif_smart_4k_qled_tv.pdf
    • https://s3.amazonaws.com/jumedemimo/suzanelisenefetezokak.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_off0000ee2e.bin
648c113d29a4805c4c55fc4175eca481d130effc443085479fafffac6b7595af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2E 5276 bytes
font_01_sfnt_off00010013.bin
5a07e6c997dedc55c562ddc93f88e3e2a34f9ab887511f9a1affedec65a65804		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10013 11236 bytes

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