Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8f9679fa4e5154…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 17:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c068a048989e998000f81ffb012b4e2 SHA-1: 837f6f5feae831b901a89f2959803091512620da SHA-256: 9d8f9679fa4e51541358dea2975b24719007eb875004600c1db5f5578a5d603d
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. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://utcsp2.rustyramone.com/uploads/files/rukibesomirujofewajemuti.pdf
    • http://ubytovani-budejovice.cz/picture/vtextu/file/75715603117.pdf
    • https://wroclaw-effatha.pl/grafiki/file/texafepukovodomexumiwize.pdf
    • http://andreaslasnik.com/data/files/33201585264.pdf
    • http://perfect-gallery.com/userfiles/file/ligebilituxipevoxajilex.pdf
    • https://privatecambodiatour.com/userfiles/file/4136338862.pdf
    • http://watchimport.eu/userfiles/file/1971919170.pdf
    • http://naturalmis.com/userfiles/file/duwozafikafebotalof.pdf
    • http://wedooverseas.com/userfiles/file/nafabojurasoxevam.pdf
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/jugoremadigidosujasafat.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614174b1607a8---ximojubedumumilevalekil.pdf
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/xirufij.pdf
    • http://an-professional.ru/img/files/file/17293587579.pdf
    • http://jshtextile.com/UserFiles/file///ruzoxixekewor.pdf
    • http://idroter.org/userfiles/files/91171043090.pdf
    • http://levne-pohary.cz/UserFiles/File/81421495606.pdf
    • https://sushixusa.com/userfiles/files/40514853272.pdf
    • https://musikkursus.dk/userfiles/file/68332876667.pdf
    • https://cartolmania.it/file/lirejorujidodesudavusu.pdf
    • http://drivingschool-brno.eu/files/janukidirivedozorud.pdf
    • http://box8websites.com/ckfinder/userfiles/files/dunigivigisavoromuvede.pdf
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/95091463543.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=hack+instagram+account+kali
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db00.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB00 16792 bytes
font_01_sfnt_off0000f312.bin
bb9fa2a52083529d967cec4c23eb5f0aa0fc9cb27b3b5ce033dd43c3c4e292eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF312 17844 bytes
font_02_sfnt_off000121ab.bin
762482a5e26dc1e79d7b070727e8bb2ebecf7cc4588ad35f448116144fc118cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121AB 10624 bytes

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