Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd469a0e4aa72890…

MALICIOUS

PDF

75.1 KB Created: 2021-09-11 06:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 404f16871ec6256d4791e845a941e9fb SHA-1: 4c9a434401bb71ce768bedb35ab44536a862623f SHA-256: cd469a0e4aa72890519d4940ae16bfed0d8e0960e538af2c45c104560f0d92b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://synerhu.ru/uplcv?utm_term=bleach+brave+souls+unlimited+spirit+orbs PDF link annotation
    • http://aeronautike.com/userfiles/file/54565517623.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/47559156421.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///gogomego.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/sunolotejaganilijofuwexa.pdfIn PDF document text
    • https://atlantidegattico.it/file/refedoziseloxi.pdfIn PDF document text
    • https://edusfera.pl/upload/file/vemijibukilemisajamibame.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/83039018298.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/97827110941.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/29450214509.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0bbabecb5---donamamexabavokoroju.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/29148188601.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/66477175868.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/fitew.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/pupemafovizafisubisulu.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/wubiz.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/kemonupa.pdfIn PDF document text
    • https://huanghecables.com/d/files/miduki.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/22112435579.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/48483730672.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/55220089411.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/jepem.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_off0000bd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD9F 11140 bytes
SHA-256: 01a429fb5a86dd36ed6f94e1a1d23bb03bc9d6e9d9cd1db75000ed08fed1e9f3
font_01_sfnt_off0000d73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73B 18208 bytes
SHA-256: 9f1c86e216fb3af02bff8aeaced892e854c0b7b8107bd99b018fb34abcf5f4e2
font_02_sfnt_off0001069a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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