Malicious PDF — malware analysis report

Static analysis result for SHA-256 672cc34cfeb14705…

MALICIOUS

PDF

73.5 KB Created: 2021-09-17 21:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 54164e2981178d7a57592956eb056d77 SHA-1: af515b62ed986e91d54929c3a589470f5d93d2f0 SHA-256: 672cc34cfeb147056daf078cb5baede6946fd2e9f2e0fdfd7ee7603253a4d9a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs pointing to external PDF files, indicating a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a non-clustered link farm on disposable hosting, commonly used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ipost.mn/ckfinder/userfiles/files/lumofunemabudavoku.pdf In PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/27947851876.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/vasalibep.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99993977464.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210915_7A7CF4117951443B.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/50826116150.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/36577422258.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/62985346810.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/rirojumedaresekufo.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/65493758910.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/gelafusasebegibopa.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/9019931957.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/51432599525.pdfIn PDF document text
    • https://arendic.cl/files/rebexadurirarebesuzajek.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/40621446265.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/22681700130.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4491199026.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/76659766225.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210906060700827226.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/85247291039.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/bodazadotetag.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f8971537eecbb9e109a51f0948e5801a/72385342165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=klova+studios+stickers+mod+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_off0000ba07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA07 17540 bytes
SHA-256: 3c12b1246782f4ff803f1f4cd243f4f243635d97dfce4a36a250d2ee832f5308
font_01_sfnt_off0000e723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE723 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3A 10820 bytes
SHA-256: ca6264bbd884e161f6b4f96dc110485e67ac118425bc1a5af864171d3c191295

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