Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f3da3cb2d368e9…

MALICIOUS

PDF

98.2 KB Created: 2021-10-16 00:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-07-01
MD5: 631bd0d330492c8534df587dd70fdfd9 SHA-1: 3a381c87720cfa6edae8b56a7366151a8d513159 SHA-256: a4f3da3cb2d368e992814a937461d0424e2f50e289cafe137072c49d086940f1
146 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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 http://brunagabriele.it/userfiles/files/sekolotezaduwegorevugebed.pdf In PDF document text
    • https://12waktu.com/contents/files/83227776794.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/tuwajexevevetudoje.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/25423679168.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/pozaripirobofe.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/zolajisoromuledizapezani.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bd6e75592d---75867013293.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/kuvuzevufupunete.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/51756707925.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/80208380640.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/10925772293.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/91805401157.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/jexajalus.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c936052157---8829605915.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/22626621680.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/40690420726.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/tenokufefejufeju.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/51804360350.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/34182002360.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/xamorikolew.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/58930658997.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/95978679438.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/sifanomesudisolanajizazo.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/sasosadapoboziwolaxet.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/5bhJmFgkeCE/uplcv?utm_term=community+foundation+of+the+virgin+islandsPDF link annotation
    • 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://dejavu.sourceforge.netIn extracted file (font_00_sfnt_off00011878.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off00011878.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11878 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001308f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308F 11112 bytes
SHA-256: e7cc96fe8539dc2c8e6e5c63bc8d877eeea2b654111fb7c6868c4c3bbe58313b
font_02_sfnt_off00014a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A22 18784 bytes
SHA-256: 52db631a35e90d250825adb1d6b5ae9392db9fc62f4201737baeafb6e6c1ff71