Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f82d2b6f5e8858c…

MALICIOUS

PDF

79.7 KB Created: 2021-09-23 14:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: afec02da3d9de62f42ad0fb32e1e1feb SHA-1: f2bf3dde82657431fc9cb14b3c87b57d3e30b8c1 SHA-256: 9f82d2b6f5e8858c1f310e9db3c81634e64c596e0935a344e3080371d1181541
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it employs a social engineering lure to trick users into installing a browser extension or update, a common method for credential theft or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it may attempt to exploit vulnerabilities or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pilot-market.ru/new/files/file/muxesifuxe.pdf In PDF document text
    • http://allivecoat.com/userData/board/file/filoniwilagefajavagol.pdfIn PDF document text
    • https://emenu.hu/editor_up/60502013722.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/79908512046.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/57125216609.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/15117605823.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/24505417811.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/f7cc17653408d7e711d1593b1bd96cc0/14389354210.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/kopavopi.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/30184249483.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/perefet.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/witagimawakukonafuditil.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210901_D06AA63BC3072DF5.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/berevutuluribubiworan.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/2871432813.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/88203115589.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/wowodaku.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/zalagoruda.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e3e86b0b8---6608858931.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/borej.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021971225423779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=transferring+data+from+android+to+iphone+6sPDF 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_off0000d24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5E 17336 bytes
SHA-256: 434823782bd8a9b29b8f4ca7289c2fe7850619fb05e08ca58ff76e5f81db5509
font_02_sfnt_off00011786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11786 11032 bytes
SHA-256: e4204781a3e8730cf8b2867ff7fd56dd7a93e86fbd61d5e8f1795e6fe6e3ba86