Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f6fc54927d24ced…

MALICIOUS

PDF

82.8 KB Created: 2021-09-10 17:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 67c0469383582869e49c28b782392036 SHA-1: 49aff475f47ea4fb0e7158fb4d5eb304f365eab8 SHA-256: 8f6fc54927d24ced93bfcedf15f8c164a2d2b1f931742480ddab042d38eb34c5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for distributing malicious content or conducting phishing campaigns. Although no scripts were explicitly extracted, the PDF structure and the presence of many external URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=obey+gta+online PDF link annotation
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f25ba036f---91349788574.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/fefutelobokopon.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/ralegosabawudikajagefoka.pdfIn PDF document text
    • https://lecachet.fr/docs/files/zikenuwadanipiluzi.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/me43m9r99e9dl4a7smarprh385/81000295133.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/tokipejabufuxu.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/rudesobalanapufez.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210904_FFE19868BE9D9980.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/19598504438.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109040548446445.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/27956731601.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/47741301950.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/zufaw.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/88700778031.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/4900388314.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/balodag.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/jeletuwavuxuleropexozad.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/risenajevufeboxaxitatonul.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/kelaxogefejaloti.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/xaliposelebefigaduviki.pdfIn PDF document text
    • http://perksys.com/userfiles/file/beribulopuxubudog.pdfIn PDF document text
    • http://lbjgold.in/ckfinder/userfiles/files/saniditeje.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/72018387483.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/fabobevusipododudesax.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_off0000dfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D1 10292 bytes
SHA-256: e71c2434ba0bc1a8b4fd6c0c956656f6028af19c93dcdb2b41329e64433436fa
font_02_sfnt_off00010f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F28 17836 bytes
SHA-256: c00f2b04b8b0cdb3da3eacd19299558d54e792a6d3e38e3deb075429ed73280d