Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e5b7f21bd530ed…

MALICIOUS

PDF

66.4 KB Created: 2021-02-27 19:31:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a786bd5710b8948f102e7e3a3bb8b4b9 SHA-1: 7c9ef0757673d82af923510ff5540c3d2c7ac7fe SHA-256: 86e5b7f21bd530edf7c4e8492bd59078692513ddaefeed1a05fd468998fc667b
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or redirect users to phishing sites. The presence of external URIs and the 'link farm' heuristic strongly indicate an attempt to direct users to potentially harmful external resources.

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://golowaki.ru/strik?utm_term=craftsman+briggs+and+stratton+lawn+mower+625+series+parts PDF link annotation
    • https://cdn.sqhk.co/zasemewiti/RQzpjel/55623996072.pdfIn PDF document text
    • https://vanixegufewip.weebly.com/uploads/1/3/4/5/134511125/womapinonemo.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/how_to_day_trade_using_thinkorswim.pdfIn PDF document text
    • https://cdn.sqhk.co/naxisedomak/IgcKib1/zombie_hunter_survival_knife.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411708/normal_5fcc4d6b43920.pdfIn PDF document text
    • http://fepaporipevari.mypressonline.com/samsung_model_rf267abrs_ice_maker.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/4640153433.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393180/normal_5fe5b0bfe6d83.pdfIn PDF document text
    • https://cdn.sqhk.co/wolanojijen/jiMH3gd/5475898517.pdfIn PDF document text
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/d11529.pdfIn PDF document text
    • http://goladelexugezi.sportsontheweb.net/rachael_ray_cook_once_eat_all_week_recipes.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/do_you_capitalize_professor_emerita.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474445/normal_5ff32d231753e.pdfIn PDF document text
    • http://gemubanabugawa.mypressonline.com/39592132907.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470391/normal_5fec2a81a326d.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/falepo.pdfIn PDF document text
    • https://zorimogitew.weebly.com/uploads/1/3/4/4/134487520/sewezubo_porosumigot_salafenala_jivuzigoje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/physics_for_scientists_and_engineers_4th_edition_access_code.pdfIn PDF document text
    • http://raxajabidadida.onlinewebshop.net/jd_salinger_franny_and_zooey_quotes.pdfIn PDF document text
    • http://litorow.myartsonline.com/wegupikawimilirejarox.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_off0000c6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AD 5908 bytes
SHA-256: c272a75cf8175d2592d291eb0087a3f2d85b409a6f5842e6930d4631141738e8
font_01_sfnt_off0000dac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC3 9724 bytes
SHA-256: 327828295509f275695b73437c7968b8aafb16703a14ecd0f13a5b3b19c22601

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