Malicious PDF — malware analysis report

Static analysis result for SHA-256 c512311f6c9e9419…

MALICIOUS

PDF

82.8 KB Created: 2021-03-01 16:57:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7be182aec0263579a1037b6b06700eb5 SHA-1: 85489911e9e8cd574b55d6147764ca24a825ab05 SHA-256: c512311f6c9e9419c5ade212ddc24f9b5de5644d712da1294754d2795fca99a4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://zajinet.ru/wix?keyword=bulette+pathfinder+srd PDF link annotation
    • http://tuderoba.getenjoyment.net/behringer_xenyx_qx2442usb_specs.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/mass_effect_2_crack.pdfIn PDF document text
    • https://cdn.sqhk.co/vifejoneses/igggiib/civil_war_battlefields_in_ky.pdfIn PDF document text
    • http://dinejokudino.22web.org/28111328465.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/u9SGgiX/ladavazadabogiwog.pdfIn PDF document text
    • https://cdn.sqhk.co/vibifexode/ighi1gP/dopizobofaxaxewa.pdfIn PDF document text
    • https://cdn.sqhk.co/mafozerekat/ji2gdCk/blue_apron_thanksgiving_dinner_kit.pdfIn PDF document text
    • http://mujudesuxiropa.sportsontheweb.net/absalom_absalom_free.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/62951918357.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kovoxajinuf.epizy.com/35574576871.pdfIn PDF document text
    • http://pejefovad.epizy.com/80952298611.pdfIn PDF document text
    • http://lojodufiburu.rf.gd/6646311727.pdfIn PDF document text
    • http://mabidorozo.rf.gd/44018168636.pdfIn PDF document text
    • http://novabimakokoj.rf.gd/aprilaire_5000_spec_sheet.pdfIn PDF document text
    • http://nifojasavolu.rf.gd/manly_p_hall_books_online.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_off00010736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10736 5180 bytes
SHA-256: 52ff5f09d858dc9ee2df6b117b87c51ced5293f7dc65cabf42bdf4679e5fc272
font_01_sfnt_off000118cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CD 10908 bytes
SHA-256: 9b1860871dcc7fa751410f977594d708b611f3404bcd6f3acb2833cdbe546bd6

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