Malicious PDF — malware analysis report

Static analysis result for SHA-256 926fb5f9ca756caf…

MALICIOUS

PDF

76.5 KB Created: 2021-02-19 23:42:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 382fe843efdb9a409f851a27fc23ad08 SHA-1: d7876d828c0d509189760929968e0e594ff46084 SHA-256: 926fb5f9ca756caf46069ed2c866fa201f2973082fdbfc9f3b5531f2e6666d70
126 Risk Score

Malware Insights

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

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

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://bologen.ru/wb?keyword=how%20to%20do%20functional%20movement%20screen PDF link annotation
    • http://gloslides.com/82509280472c650k.pdfIn PDF document text
    • http://comforfemj.fun/free_proofreading_and_editing_worksheets_grade_5l9pmu.pdfIn PDF document text
    • http://jebumivusesujan.iblogger.org/how_to_make_user_guide_template.pdfIn PDF document text
    • http://degelumokufipim.22web.org/84116189232.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/hehhcdu/top_100_rock_songs_2008.pdfIn PDF document text
    • http://rusakova.space/copes_acute_abdomenmov3w.pdfIn PDF document text
    • http://salonop.xyz/ireland_rugby_shirt_size_guide36dco.pdfIn PDF document text
    • https://cdn.sqhk.co/sexuzoropa/zcje8gf/sky_convention_center_events.pdfIn PDF document text
    • https://cdn.sqhk.co/zafowavo/pZghhex/25363720073.pdfIn PDF document text
    • http://insta-sale.site/what_are_the_rules_in_the_book_the_rulesl8yg9.pdfIn PDF document text
    • http://triple-doska3.club/gofaxizizewn64o4.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/fjfZO1L/16931455405.pdfIn PDF document text
    • http://didezidise.22web.org/samsung_galaxy_j2_theme_store_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/leruwexikud/jevidha/16182802032.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://giwofigu.epizy.com/carpet_cleaner_reviews_consumer_reports.pdfIn PDF document text
    • http://depexezopip.epizy.com/audit_report_meaning_in_business.pdfIn PDF document text
    • http://logeger.rf.gd/kukesixejelovemagalulep.pdfIn PDF document text
    • http://nemebikox.epizy.com/angular_template_variable_scope.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_off0000ecfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFD 5280 bytes
SHA-256: f126220338cd0dc18a5753606b4902162ac76a50b1dd737832ec5e661e0c1edc
font_01_sfnt_off0000fef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF2 11372 bytes
SHA-256: df5c043bf582ae2d4b0d9c4daaa52f421fd63d4472c2f701c695fe47563c087e

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