Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f41def633d5cc6f…

MALICIOUS

PDF

69.1 KB Created: 2021-09-24 19:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e40b7dd18c5ec751d0baffce9db196b SHA-1: a0466d69b7cab35441d7a089122811c9129c351f SHA-256: 5f41def633d5cc6f37aee39f609fabb438d1ff9ac79ff656c2cd72c151f93dc4
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable link. The heuristic 'PDF_IMAGE_LURE' indicates a typical phishing shape where a screenshot hides a button to launch an attacker URL. The ML classifier and ClamAV detection strongly support its malicious classification. Although no scripts were explicitly extracted, the presence of numerous external URIs suggests a redirection chain likely leading to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://queure.ru/uplcv?utm_term=watch+world+cup+online+free
    • http://contrast.no/ckfinder/userfiles/files/95544258382.pdf
    • https://greenlakepaint.com/ckfinder/userfiles/files/35506104581.pdf
    • http://tortsurprise.ru/upload/redactor/files/bumesudupevimatulesig.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/aa52d509247be0f2f4e73eed4825417a/buxavepotoxuzukedujekebof.pdf
    • http://vipnovini.bg/root/f/uploads/files/najetimitalub.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/44320997191.pdf
    • http://togclick.com/media/userFckfiles/file/5977523669.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8822cdf91---61057964833.pdf
    • http://driver-jazda.pl/upload/file/49991477240.pdf
    • http://barrybusiness-crm.com/ressource/devis-photo/files/bafagibozegositibakunu.pdf
    • https://locoffice.ru/userfiles/file/48329377247.pdf
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/fenaxevizabub.pdf
    • https://ntpuvoice.com/ckfinder/userfiles/files/91261987842.pdf
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/12884741029.pdf
    • http://alwaysshine.com/fileimage/file/pumedotatigipufoxevixemer.pdf
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/soruwogijibe.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161432f0313f48---sosamixulete.pdf
    • http://megaprestige.ru/uploads/files/56640475247.pdf
    • http://primaria-ciocirlia.ro/media/file/49652447999.pdf
    • http://solarwindependence.com/ckfinder/userfiles/files/99848605052.pdf
    • https://weldingportal.it/userfiles/file/jasapita.pdf
    • http://bkm-market.net/userfiles/file/biruzutowifofegabulabu.pdf
    • http://pneusmarene.it/images/file/ladixex.pdf
    • http://vinacafe-dalat.com/Images_upload/files/23432205572.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2e0.bin
ed876044e93c57077a55d0677bae20a1b1c3c0b602264e845a1ab61dda4aef7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E0 14172 bytes
font_01_sfnt_off0000d5ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EA 16792 bytes
font_02_sfnt_off0000ee01.bin
6e34ce609c0c10f590c522697f8e2cbfff994c43f228383e22eb33067d727238		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE01 10728 bytes

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