Malicious PDF — malware analysis report

Static analysis result for SHA-256 3351f292c27817c6…

MALICIOUS

PDF

69.9 KB Created: 2021-09-30 12:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 025cd5bc299fbd625a67ec9f249d970e SHA-1: c9d962eedcbc81a60b4ff078df612d2c1d7ac5c1 SHA-256: 3351f292c27817c631a20af775e8f371be44f3208e219744f5af616afe432246
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=cdisplayex+full+apk PDF link annotation
    • http://thuocamakong.net/userfiles/image/file/93070597562.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/zimife.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/gajik.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/1364978156.pdfIn PDF document text
    • http://danceaction.be/userfiles/file/42567123516.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/13099342410.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/jejuritujowebamadupegi.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/gofumogesagujeken.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/27742774362.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/1882810b084c86512d99618d316a6f68/mujizilal.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/momeserezametiguwoz.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210916070613.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/pizopovaxiko.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137598841f46---wuweregagan.pdfIn PDF document text
    • http://aibrpjoaae2.specialty-match.com/upload/files/xeburumiragoloxubaxevidi.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/riwapojuzekolomuruxeloto.pdfIn PDF document text
    • https://fratellifurloni.it/file/88606255038.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/fanemabaf.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/guwaxariwoboxosenevasa.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/mewujurebivak.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/tanem.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/watodabarokesot.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/42565116755.pdfIn PDF document text
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/38582829396.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_off0000b230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB230 16012 bytes
SHA-256: dd9864b476433b91fecfc1923f0916322bfa75865798313c53b3f730fe8d7198
font_01_sfnt_off0000d9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF206 10508 bytes
SHA-256: 493315f874c4af440e32bc0879c44303746fe71469401a9e188ec41e90e4fc0a