Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3bb71c241c0f1a0…

MALICIOUS

PDF

71.3 KB Created: 2021-09-27 00:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ea54c39924bb51e13a5a11e5d17f2389 SHA-1: e24f0775e754be1cc950f52c0753cf683d473f5a SHA-256: f3bb71c241c0f1a0850349fc85efc2a8741f9c8d08f83e8921fe577516d13beb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://wastran.ru/uplcv?utm_term=lifeafter+apk+data PDF link annotation
    • http://jamalcar.com/userfiles/file/65009483781.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/ribipubojaxawawewit.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/kajimoxamoviwerefokomij.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/tafozivesuweburamuwagiv.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/40260885060.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/18863435696.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/36033982093.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/wimudexudajesojeg.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210924105027.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/98164254156.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/7095749023.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/mejog.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/worovivoselagidewifebu.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/75222255419.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/96626611530.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/nofamizugo.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/15991266791.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/9280bd20a183817a3f0782e280fda027/dibujakus.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161495cc9e885f---zuxotor.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/katesawozewifozunul.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/zuruwetowozutobad.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/1388626889614e490babca2.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_off0000b36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36D 17920 bytes
SHA-256: 7429a48b7d5bee2c92d592678316ceb2c031adffc44972f99d6a7983a6b2e4f6
font_01_sfnt_off0000e0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EB 10104 bytes
SHA-256: 6f96be0e9c6f734aa7b15349016ffeb80a6abad747988e85cbb3bd2356559e04
font_02_sfnt_off0000f791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF791 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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