Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c26186fae52822c…

MALICIOUS

PDF

78.4 KB Created: 2021-10-20 23:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f7d0555e74a4bc467362243367cfdb91 SHA-1: fe18e168440b02e793e621a0cf1c64780f869f5e SHA-256: 3c26186fae52822c58e34329d480f4f4cfb9d7598e44119c3350e11a5f44709f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is a link farm hosted on disposable domains, designed to redirect users to other sites. The embedded URLs, although many are unknown or benign, contribute to the overall pattern of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://geometracosentino.com/userfiles/files/peruwuzawoligumi.pdf In PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/tejuvabo.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158a53374d3c---devujosomor.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/mexupegonodoretaji.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/tawagawowavejefogov.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/jinegizi.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/99982433576.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/55007474219.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/24824385655.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/jizidonobafosubujovezow.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/64095034359.pdfIn PDF document text
    • https://aashianarealty.com/file/76455385486.pdfIn PDF document text
    • https://fptica.ru/images/file/wizidelowedavekibowor.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/46811677145.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/83945484518.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/falolazifajapexemezijebu.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20211017225648_493488240.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/D9plVHj2VOU/uplcv?utm_term=1+mile+to+ftPDF 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_off0000cd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8E 19164 bytes
SHA-256: c37c7771b8771b6c8507516badc13b581f0aa3684a235aa4e26a234eeee369f8
font_01_sfnt_off0000ffa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA8 9796 bytes
SHA-256: b9a72b4ee7bb7f1e2418f6f17f0648239a0629e9e27192bfe1d9fb385e0dabf0
font_02_sfnt_off0001151b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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