Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6f074e35e4789e…

MALICIOUS

PDF

83.4 KB Created: 2021-10-21 05:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c041296f5710639e02389293955a7be0 SHA-1: a0183cbf56bc3872c3ba9a43132d00648a0d682a SHA-256: 5a6f074e35e4789e95b81f762ba8702081e1abeef3a401cebf7d9c4454629e71
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The PDF contains numerous embedded URLs, many of which point to potentially malicious PDF files, suggesting an attempt to redirect users to harmful content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pastoret.it/userfiles/files/fogizekulaxivarobadowufun.pdf In PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/81855854612.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/malasegogor.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/22986067070.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/49230396271.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/27340865136.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/70076886340.pdfIn PDF document text
    • http://chikatere.com/Upload/files/41384494273.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/89943743391.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/9449319317.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/97791489483.pdfIn PDF document text
    • http://klpa.net/userData/board/file/37246751144.pdfIn PDF document text
    • https://guijek.com/userfiles/file/dokuxal.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/gizevozowofaxominoxefiz.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/tavapaziluzi.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/malesud.pdfIn PDF document text
    • http://sergeybazarov.ru/file/dolizupokilobutot.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/90240358379.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/pavonesetararabaru.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/92691680948.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/39970710544.pdfIn PDF document text
    • https://thenovgorodspaceship.andreirozen.com/images/files/1152775377.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/706304128.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/88065886238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/RhDyTiV0TgQ/uplcv?utm_term=the+spiritual+law+of+honorPDF 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_off0000e20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20F 17468 bytes
SHA-256: 71eca6f2474f5b85a442825cb3476739acbd2357b0e9b87a79015c445dcaa643
font_01_sfnt_off00010f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F23 10604 bytes
SHA-256: 6c88d3b8bd91a14f3741447f1e7b9879b228bbe6862f5da54bc9203e8045a756
font_02_sfnt_off00012764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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