Malicious PDF — malware analysis report

Static analysis result for SHA-256 95ce676255c8b4b0…

MALICIOUS

PDF

85.6 KB Created: 2021-10-06 20:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 195269e90c1f6a8336c79f0e5904a9d3 SHA-1: 4cc070e0fd7d5c87dcbad28953428e62a664af9a SHA-256: 95ce676255c8b4b0518013a8c681d817c6f470122e2d2ce272c58d9ffa002f77
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://garglob.ru/uplcv?utm_term=substance+painter+not+exporting+all+maps PDF link annotation
    • https://suativisamsungtaihanoi.net/upload/files/96982451120.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/rugofepadegafegu.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-5/20210905065835725563.pdfIn PDF document text
    • http://sakem.org/userfiles/files/kurujezezadusibo.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/pegugosajubesoke.pdfIn PDF document text
    • http://pk.mo/userfiles/file/lifiwupani.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/zafisebedegofisim.pdfIn PDF document text
    • http://dejede.com/userfiles/file/gepiwusirububoraxe.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/13686247448.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/sojekotagigigorebunejine.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81174230983.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16156ea2f95fe4---komoxadaluwukab.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/9667848646.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/moledokeniterarisadufe.pdfIn PDF document text
    • http://kohaz.hu/files/file/jemewezunubomarusanep.pdfIn PDF document text
    • https://maisonfamillesrimouski.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/66801417314.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/porej.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/28281482513.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/razozozozapexaruwamu.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pivexuvafufiguladudogado.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/modoni.pdfIn PDF document text
    • http://jump360.co/upload/files/20210924120919.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/jidad.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c9b203eb3fa57585f2b3fb4e8c81cf22/54386816919.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/77644764754.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/53410020202.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_off0000e22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA45 11132 bytes
SHA-256: ec99ad362f425aea067a2b3b7ec28d994eb3335e5b94e132c628de74add86d6a
font_02_sfnt_off00011413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11413 19692 bytes
SHA-256: 8fb531ee3538f196b3e195d2566ed69d1e5062d161fde24776e1dd08527555c9