Malicious PDF — malware analysis report

Static analysis result for SHA-256 df567f92f8ae7293…

MALICIOUS

PDF

78.7 KB Created: 2021-03-02 02:52:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ae24c0c9e13e5d5d36171fdec9672ef0 SHA-1: 1980e7f2bc4d185894a2dec56503635b985105db SHA-256: df567f92f8ae7293e4ee01bb3040ede75e3a05db7bc76cd33fe949c40ea3fb39
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://fokemale.ru/wix?keyword=troy+bilt+pressure+washer+parts+diagram PDF link annotation
    • https://wapofaxuza.weebly.com/uploads/1/3/5/9/135992917/fukixito-salikefimabimu-ferawir-pupisokeninose.pdfIn PDF document text
    • https://cdn.sqhk.co/novoganug/hgjhbnc/five_nights_at_memes_demo_game.pdfIn PDF document text
    • https://xugatasota.weebly.com/uploads/1/3/4/6/134673622/bowowavix.pdfIn PDF document text
    • https://cdn.sqhk.co/zekuxemelop/ZrDichh/61968437087.pdfIn PDF document text
    • https://cdn.sqhk.co/tepikipo/DhjhcAF/dungeon_master_s_guide_5e_anyflip.pdfIn PDF document text
    • https://cdn.sqhk.co/pugepavofu/iih9uge/best_2020_4k_tv_for_gaming.pdfIn PDF document text
    • http://budokudepa.scienceontheweb.net/jane_jacobs_robert_moses.pdfIn PDF document text
    • http://wamuwosola.mygamesonline.org/54127709641.pdfIn PDF document text
    • http://xegisurasajem.22web.org/28098541117.pdfIn PDF document text
    • http://lixodamevurobar.mygamesonline.org/hornady_6.5_creedmoor_140gr_eld_match_load_data.pdfIn PDF document text
    • http://rixorevu.getenjoyment.net/what_are_curriculum_areas_for_preschool.pdfIn PDF document text
    • http://fezideruxojogo.iblogger.org/certainty_severity_and_celerity_of_punishment.pdfIn PDF document text
    • https://cdn.sqhk.co/pilozarager/gzifFa7/playmemories_home_application.pdfIn PDF document text
    • http://lubevos.scienceontheweb.net/2599520672.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jaxegowanav.rf.gd/3322570808.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/swot_analyse_powerpoint.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/ac_market_apk_full_version.pdfIn PDF document text
    • http://rixijine.rf.gd/puvobevuxudiravane.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_off0000f676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF676 5656 bytes
SHA-256: c0ae6f55554f3d13028d43167200d69c8520da518efa9139fac5b9428bac3d7d
font_01_sfnt_off00010997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10997 10476 bytes
SHA-256: ddf1d582f06aa12f6a74cd0e3fd2ae7ca82c805d3b655e02b90d5cba84f79955

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