Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bfb66487852b3aa…

MALICIOUS

PDF

96.1 KB Created: 2021-09-12 03:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 46edb8500ce6170779214ebb0dad0477 SHA-1: 0a6373be104ed5d77ffd946cd3143f1885ee0a6c SHA-256: 7bfb66487852b3aa690e17a07a0ebca672354d3cf662578a8350a2853bee9c37
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://voszveszprem.hu/_user/file/lowebiv.pdf In PDF document text
    • http://www.donboscovizag.org/images/files/satuzig.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/8645647136.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/77125725684.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/pevutuzuwuxeriruxuxu.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/delisivegixogefega.pdfIn PDF document text
    • http://sns.hu/_user/file/vobutirifugep.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/14045512799.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/35820254045.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/96805790388.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/36543526947.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cacd5ad855---rikodimovukifoza.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/37522161289.pdfIn PDF document text
    • http://aven.su/userfiles/file/16464101851.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/74423458291.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/37125987932.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/pumidol.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/balavevedeso.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/xijafibofegejumuz.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/93644426420.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/66873400892.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/16847902508.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/26672279667.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/99467482274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=gray%27s+anatomy+book+pdf+head+and+neckPDF 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_off00010f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8E 11168 bytes
SHA-256: 9dfa065b78ceaf48b97474bb3be13c212263c0f5572e6ac01bebb1710eb8abc0
font_01_sfnt_off00012965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14177 18164 bytes
SHA-256: ec79b2602d14886add4bb8a9ece68e1174fbaf7725186f18afbccc7883cd8475

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