Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a85dbcfc69eba5…

MALICIOUS

PDF

70.7 KB Created: 2021-09-27 18:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b03dea678b24c64fb45351abddeb62a1 SHA-1: 3c7d369907d1f0f44ef6ca0cf66dd019ed93a40d SHA-256: f3a85dbcfc69eba5cb981b72510e4eaab79b002768ce4e53f7b9895266f01925
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or link-farming operation. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=gastorio+press+ltd+reviews PDF link annotation
    • http://insfilings.com/skyzone_classic/upload/files/25064722335.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/22334141682.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/dofex.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/49795397687.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/tatefabomewetoxunekuza.pdfIn PDF document text
    • http://ipublicity.cz/data/file/95556014010.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/zalavitiselesinojo.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/fawami.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/88580324514.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/65304801026.pdfIn PDF document text
    • http://congress.bpv.su/content/files/files/89008803127.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/dfaba3cd9737dff805860a293e81f815/wajugezozipijejivoxudul.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/38598540177.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/rotikegob.pdfIn PDF document text
    • http://teplospectr.ru/images/files/35974109816.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/levot.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/21389554240.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/53438411463.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/dolezerikikipomer.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/16013742459.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/loxapewuxal.pdfIn PDF document text
    • https://gdaniec.com/upload/files/diroluxajirixofev.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/jomirekajesinufoveva.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/26157270022.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///gozijoluvakubezuguboweg.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_off0000b381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB93 15868 bytes
SHA-256: 2cb42f3153c71d1c63200777d70570af7e084f87197fbf1a7dba365a67a5464e
font_02_sfnt_off0000f355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF355 10472 bytes
SHA-256: b9a20a3ed181068c13b9da0bc434c111266532d90380270acdd12ae69d699ffc

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