Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6eaadcb5a077596…

MALICIOUS

PDF

89.2 KB Created: 2021-09-18 10:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ecf8fb7644875a5abb3b83c705088f96 SHA-1: a9cdac59102f61f73cedf8400f354b9e65b5a887 SHA-256: c6eaadcb5a077596019044bb364c6966f39d960476069309f82e5a446c093898
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected by ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious PDF files on various domains, suggesting a link farm designed to distribute malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a pattern of using disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier clean score 0.1739

Heuristics 4

  • 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
  • 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://pelejas.com/IMAGENS/CKFINDER/files/nokuxaxusaxirogip.pdf In PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/31438540785.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/83388250483.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/12462269262.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/gozijusuwamozegefazuxifu.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a270fb2155---bodipogazokozelabile.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/18774623166.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/66290714105.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/dujenemok.pdfIn PDF document text
    • http://ombs.ru/uploads/files/63631466545.pdfIn PDF document text
    • https://duel.pl/userfiles/file/dujamoriwoge.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/vebojugibigifevof.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/zokadaketaturidugudoku.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375d5fbeab5---45996733311.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/3449916068.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/64474278102.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/faludu.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/8736925325.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/pulupi.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/wefew.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/75150395457.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1631480475491580490.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/43652203582.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/zewip.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/24765015407.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/57117216148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=android+java+video+playerPDF link annotation
    • 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_off00010b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B16 10408 bytes
SHA-256: 7d42012be71d816a64261bbb122b5b73685bc44d4d2822198936d06dc8c105d6
font_01_sfnt_off000122ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABE 17928 bytes
SHA-256: 12e158d156db2bf009c280d62db85ca156628b6b24dae767e2fa750d94cb7843

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