Malicious PDF — malware analysis report

Static analysis result for SHA-256 a355fe8011562c2c…

MALICIOUS

PDF

72.1 KB Created: 2021-09-17 22:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bde11b7cb77ef7753f1628a39811ae1f SHA-1: 63879e0d600ec54808d67c066d9dc0caa78d6383 SHA-256: a355fe8011562c2c633757e2c165c3bc6ecbade2e48a3f5a701e88cd79855004
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, suggesting a link farm designed to redirect users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates these links are likely part of a scheme to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/fumeden.pdf In PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/43691931049.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/58865358671.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/teweduvoxuzemo.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/19227208157.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/zogukekatakapewakubexubus.pdfIn PDF document text
    • https://guijek.com/userfiles/file/xutevofipanalirosimowipo.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/61143222857.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/difakujenesavike.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/81238631873.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/zusezoparuwam.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/1954883415.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/75526906021.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/21282603482.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/59122409278.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/jakogufodedidexadekirebe.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/67651427525.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/72933147983.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/pudaduwijeloko.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/sagojekika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=leprechaun+origins+streaming+vfPDF 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_off0000b561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB561 11004 bytes
SHA-256: 2934d8c1ee29c4a7f1f3ce4b000ee40f2a14e0397333ff9707304cea3197fc67
font_01_sfnt_off0000ced5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E7 17080 bytes
SHA-256: 7219ac7caffa1acfd782bba18237299e85cbb25bcefa5ff839110b952698119a

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