Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24299cd1183b32d…

MALICIOUS

PDF

84.6 KB Created: 2021-09-17 14:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6f6e8e005974467c326dc8dcdaa770de SHA-1: 2f07cb513821753fc0cebec70fb807cf910b8906 SHA-256: c24299cd1183b32df5d1e52079d5c12c63f04c80c5f8f94e71e85963e753328f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Heuristic analysis revealed it functions as a link farm, containing numerous embedded URLs pointing to potentially malicious content. While no scripts were directly extracted, the nature of the PDF and its embedded links strongly suggest an attempt to redirect users to phishing sites or download further malicious payloads.

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://alda.pl/ckfinder/userfiles/files/47696770928.pdf In PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/duzebiturajagak.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/52125250688.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/14518540153.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/73355913351.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/81255356699.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a91a6c424---mofukonufudomutigomuru.pdfIn PDF document text
    • http://th-hl.com///upload/files/18035653603.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/61226108556.pdfIn PDF document text
    • http://npas.ru/pic/file/dabewepagiza.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/48503103214.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/40252705831.pdfIn PDF document text
    • http://a9188.com/upload_files/art_files/files/20210902_063147.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/suwebofaxujusijudun.pdfIn PDF document text
    • http://na3.it/misc/file/xebabifuku.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/58415967856.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/93088416537.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/73854930618.pdfIn PDF document text
    • http://travellerisland.com/files/duwawopulo.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/kufubuduwajanuwujigubexu.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/zagexumegubebere.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/942936489.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tovupete.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/56903833467.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/rixupisonibopoxabekavage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=shadow+fight+2+latest+apkPDF 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_off0000e69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB1 17184 bytes
SHA-256: cccff45dd4980fec85c27a59980faf323cff2759a31e938e97c4e5fe04c7d1ad
font_02_sfnt_off00012b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3C 10948 bytes
SHA-256: 351ea66f4a90ae8ac92870717d1fe109bea6712a273c60e814d074751b87f977