Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c652d0442272b0e…

MALICIOUS

PDF

80.7 KB Created: 2021-09-09 04:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7421634ec09c686a925388a33db3670b SHA-1: 8a7d8412b2e5f373346dbe318156ca817041e17b SHA-256: 6c652d0442272b0efa99838e39eefa4f179e6a0b2c1733e8f63932b24315ce1d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous PDFs on distinct domains, with many of these URLs being unknown. The presence of embedded URLs and the PDF's structure suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://xedaphcm.com/luutru/files/kawimiriniw.pdf In PDF document text
    • http://kaies.net/upfiles/2109082245404437404yjc6l.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/87383284499.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/21478366569.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138495e261c5---56497192530.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/35204023345.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/91636705470.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/70792986381.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/51179027446.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/75192405862.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/18145429305.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/25321732145.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/36776866440.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/58488215999.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/babopazarexabituz.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/js71kso5kgp7ccac1sb4vl2etd/nagamarumaj.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/4145989982.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/38887049042.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/zekirojasebuzu.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/74429726020.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/ravidemifalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=research+methodology+creswell+pdfPDF 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_off0000cce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE0 20904 bytes
SHA-256: 8aebd4e3a40b7d98ff389141db857d1d15f1dbca2b052f48f08ad6b9cb8340c1
font_01_sfnt_off000103a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A4 11116 bytes
SHA-256: 0728baa35aea2993ea18354bce6ab3ebf34350d4dda89982ac261bd3a9139714
font_02_sfnt_off00011d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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