Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac7876ccb62478a…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 17:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d6496b30473d758a8ce117cf8f337210 SHA-1: 2cbb262720b0b1a73c07fadb42b9ca41d03460e8 SHA-256: fac7876ccb62478ad033530776b75a0edbdbd1761e78ec0e7f897df4db258da4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including a link farm on disposable hosting, suggests the document is designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to a link farm strategy, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=windows+7+home+premium+64+iso PDF link annotation
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94291034130.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/2128566624.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/71945604921.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/41222492746.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/15341900221.pdfIn PDF document text
    • https://proia.bg/userfiles/file/tajajirikiwapovumusakisuw.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/99400330287.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/43087174796.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/32178925054.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/kivenijobokosa.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/91084447805.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161356856a34f1---69714634474.pdfIn PDF document text
    • https://digicpictures.com/downloads/tudezoruferuzigoxow.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/temudedeke.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/porolo.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/buketamumirubo.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/geratuwobovuzil.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/37061020404.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/80583194573.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c8391fe4cb687292ebc7a0efb49a7f4e/51107794853.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/63486770332.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/mebijobupadanonitijikesej.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/tilekemafogu.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/tibejejerowalajesim.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_off0000d8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A0 10828 bytes
SHA-256: 05894bece4bb5ae51cfc930365b573d46e2ad2f413749142925b2c55ef3e9730
font_01_sfnt_off0000f180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF180 17824 bytes
SHA-256: ba5b221a9525987404f4d05729bced4ece88fa2826b418a8a7d2627707ba3b9c
font_02_sfnt_off00011ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1