Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0cf6f428e847fad…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 10:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 294fb7c3db43148b1112be8659e039a5 SHA-1: c8cdbe24b821255150118203c58f36d297b1d0d0 SHA-256: d0cf6f428e847fad998b206e8bb3e8569e28b3e8a5a2f493d24364f22c9f020a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier 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. The presence of PDF_SEO_DISPOSABLE_LINK_FARM suggests an attempt to obscure the true destination or distribute malware through a network of disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://er-cardiff.com/eurostyl/photos/file/jitorex.pdf In PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/60490702453.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc3b5ed8f9---45658313521.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/zezetedasabojakidad.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/64352492574.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/vaworijuvidozuwoki.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/ginok.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/20186393159.pdfIn PDF document text
    • https://ksboutlet.com/file/files/vazufiweratijusu.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/39361016432.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210904_54F3074FE1A8534A.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/zifejigawijami.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/47934377257.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/79734785795.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/zilojazuvekorumelapos.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/bebomurekofumoxoduka.pdfIn PDF document text
    • https://maria-galland.ru/files/file/53588118051.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/xafiwitegal.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/7624344474.pdfIn PDF document text
    • http://wernitznigg.at/files/loxel.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/51171125534.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/64501141218.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/gufanuboson.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=tinker+board+android+tvPDF 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_off0000dd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF543 18272 bytes
SHA-256: cee9b65bbf886ce2551fea8349492f3d795b519175a4eb32ebc84bb0360568b5
font_02_sfnt_off00012576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12576 10288 bytes
SHA-256: 2a7c415c3942301382be32b5cab654940cdfde0dadc996c6e8ec1b7e952003ac

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