Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cda7b0de679f29a…

MALICIOUS

PDF

97.9 KB Created: 2021-09-12 16:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 17531bda814f9e591c8e9b5b29c85fa6 SHA-1: 8ef2c773dac43bb794c1a298e7e7e1a5cb8eab4c SHA-256: 2cda7b0de679f29ad87843969c82bd5c27b8b15fc339266b40d0b3f127d1c9d0
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. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. While no scripts were directly extracted, the PDF structure and the nature of the embedded links suggest an intent to redirect users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kursadowicz.pl/Upload/file/lisagibutedat.pdf In PDF document text
    • http://iweldbot.com/ckfinder/pho/files/jexin.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/76803255189.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/majagotavopapo.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/0jg5r8inf7eolgh0qv4ngdn5p2/86297644887.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/89773629039.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/gokotunoluruvavafeseralam.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/78629210690.pdfIn PDF document text
    • http://proxima-design.cz/files/file/sesitaxuluvol.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135ca2b408d6---68128856190.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/48179156207.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/82933287151.pdfIn PDF document text
    • http://renknh.com/ckupload/files/87041944433.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///jijizagureniverurefefawu.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210901file///39281214816.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/natuzolutujizokitiri.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/pevusunubugotobavagig.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/60046976737.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/91027620727.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/93416721609.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/rofuvetafopewa.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/mirufolokoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=paradise+toni+morrison+pdf+freePDF 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_off00011985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11985 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13197 18536 bytes
SHA-256: b6edf692c6cd8018b9d9d250222e7f92921b47207c3c7cc207f57d288cd10537
font_02_sfnt_off0001615f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1615F 10612 bytes
SHA-256: 5d6d5591943dc8f487713bf9273ca27d2c77468cd110521cc9e7e29b179a5857

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