Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c4eafc3e807fd7…

MALICIOUS

PDF

78.4 KB Created: 2021-09-15 15:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c2eccdcfc17567286230fd0837bda485 SHA-1: 32d63a3c87fe0d27a4d71094129b02159dd02584 SHA-256: f7c4eafc3e807fd73f6d7c3633be8ba88981776c36de28a5e8d39387fbed1771
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to obscure the true malicious destination or to distribute various payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://cructi.ru/uplcv?utm_term=the+art+of+spyro+reignited+trilogy+pdf PDF link annotation
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/41962401619.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/27435172584.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210912_140624.pdfIn PDF document text
    • http://fluorescent-training.com/file/jofobesumunokifuta.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613E37CD19103.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/jenijidedu.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613867b5160d6---dagovalitod.pdfIn PDF document text
    • https://fivetc.net/uploads/files/rejib.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/169af78879c1c3eb98f72b4c47b4f84d/73352426402.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/foxudun.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/8047158322.pdfIn PDF document text
    • http://njchemland.com/upload/files/doxujusuzolaxeposiv.pdfIn PDF document text
    • http://saktigroup.in/uploads/wozinixa.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/53161116937.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/boguzefuxafopetoduzijep.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/99739927003.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/47515247615.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/tabenuk.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/38420788221.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/motopujuximisebi.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/15888507766.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/gofijexapegukul.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97E 10856 bytes
SHA-256: 0d9713813b70e3fdaf63edd6baf3290249aafe9755aa0538a3511c040a8ffe47
font_01_sfnt_off0000e250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE250 18980 bytes
SHA-256: 8d099b0c2a9b10c3b4b16e4601b28f06358097d6898b2151a2a26567dffbd06b
font_02_sfnt_off000113ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1