Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4af9a0bbc2b90e…

MALICIOUS

PDF

69.5 KB Created: 2021-09-29 01:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d1d6f5e9fde153d7f6944e2bf7e89214 SHA-1: acedb1cfe3e52d2e68709d08495fb80f51249a70 SHA-256: ad4af9a0bbc2b90e86cbcbd823bfc3ac8cd875d1f94b9426d66dfb51b97ab89a
126 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs that form a link farm, with many pointing to disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern commonly used to distribute phishing content or malware. The presence of these links suggests the primary attack pattern is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://hzbmsj.com/images/upload/File/9572590304.pdf In PDF document text
    • http://utuin.net/files/fckeditor/file/86387796790.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/73002218104.pdfIn PDF document text
    • http://cpviettin.com/upload/files/49725770646.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/mamolopatipiwutevax.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1631031184.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210902060430.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/zavesuzixejekulapexezo.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/miromarejevuladazojun.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/laxivituzoxuxotivexusuko.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/xofajelitowedaka.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/bapuwosuzunurove.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/27fd0dfb44502c3aec09fa8210680f3f/93191771916.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/2672606875.pdfIn PDF document text
    • http://fohow77.ru/upload/file/funokiwamejaroxelilewoxol.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/52402822805.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/tazizev.pdfIn PDF document text
    • https://webhosting4.net/media/file/komovojidipebufame.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/15610523834.pdfIn PDF document text
    • https://noventa.cz/media/files/file/82330627386.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/xujixiziso.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/makogeditorisobuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=flip+it+like+disick+putlockerPDF 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_off0000abfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABFA 10408 bytes
SHA-256: 2310c4a207e9e7af25384e2b90fb8b6b4fd674582781743c563017d93336250c
font_01_sfnt_off0000c3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A3 16924 bytes
SHA-256: ed91053cc51fc2f302d5a9a11774c8c395ce168cf06f223ad90ffbefa91a3b7d
font_02_sfnt_off0000ef53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1