Malicious PDF — malware analysis report

Static analysis result for SHA-256 326692db9a539fc0…

MALICIOUS

PDF

82.1 KB Created: 2021-09-14 11:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2a599ae31505d4044c9b01a6f9abb611 SHA-1: 4040fd89d017e29b89976eb9bc99988b5a5cce4e SHA-256: 326692db9a539fc0c4297c1eb45d2a211a3bd5b431cdb995ce6456e71e5e7869
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://aucoindeshalles.com/menu/file/26446161688.pdf In PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/72376295803.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/xitoreponefojedazifo.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/56900088273.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/nakizovapux.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/58725768343.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/26462446683.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/33760392897.pdfIn PDF document text
    • https://krossi.ru/images/content/files/bajusepifagiva.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/90080782510.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/22979748057.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/72542309043.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/5614736988.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/jukajofumojuk.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/79308508040.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/20873852041.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/59759522918.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/92050853016.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/35221102449.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/jafow.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/loxosep.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/kupotogagexuburixuroj.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140497f9ff02---puretebotabukorep.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/metewu.pdfIn PDF document text
    • http://co-mit.com/uploads/files/fuzizegugomugovome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=galaxy+watch+lte+sim+card+slotPDF 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_off0000dc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3E 17544 bytes
SHA-256: a5c76e6c141d14c6c3e339a890b8085291ba9e69d19f3ef81261975133aeeec5
font_01_sfnt_off0001098e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098E 10872 bytes
SHA-256: d05dc5088b823f9ef912a80a287afbdc6741f258b41559c4baba4c966eb3a0a2
font_02_sfnt_off000122ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1