Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4c974bd30da311…

MALICIOUS

PDF

79.1 KB Created: 2021-10-06 07:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 209b571ebd5df67ab5168d50561caf3a SHA-1: 3579f41d30286c9aa375d841e13c0cdb9e50ec3d SHA-256: 9f4c974bd30da311adfbff4c65a730728dca5a32ac5850a8610160ccdc941954
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://heatingboiler.ca/fck_upload/file/35009249387.pdf In PDF document text
    • http://batiment-tunisie.com/userfiles/file/49510052600.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/duduwuvefewali.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/75028599647.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/62672706866.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/78076676362.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/jogizafebupipizurazoxup.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/68035843773.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/nexezopazeriwigadawuloni.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/sizivavejadomipi.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/50745620834.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/tojazakaludetufipukasojat.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/99597719941.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161598b45e53ae---toraberanulidakezuloluv.pdfIn PDF document text
    • http://kaies.net/upfiles/file/sefegawuwosavadaxuwavib.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137996d17466---rafexuzakekuk.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/fabagafevewejasuvuxezov.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/pikapevidudumesawugesuf.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/nolilizume.pdfIn PDF document text
    • http://regmac.net/userfiles/files/855887081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=hack+covet+fashion+without+human+verificationPDF 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 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_off0000ced9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED9 18432 bytes
SHA-256: 9cc89ebc487f50d113bdb09d217bc71510b93b9a624178d28a85a6c7dd761112
font_01_sfnt_off0000fd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B3 10888 bytes
SHA-256: 3405006a26d7316ad7984e6a86d7ab23a719dd418b3242732052fd0a61c957bb

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