Malicious PDF — malware analysis report

Static analysis result for SHA-256 43064dce610e34a6…

MALICIOUS

PDF

81.7 KB Created: 2021-09-10 21:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7446f0abd9e1bbd55983677b853ba15c SHA-1: 229507f8c61343b7904506eb42d9cae92d96be8d SHA-256: 43064dce610e34a6b4cf09bb557acfc2ad92d92569b58fdaa2cdfba2598becef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on disposable domains, a common tactic for distributing malware or conducting phishing campaigns. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, noting the use of many distinct, potentially disposable hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://land89.com/ckupload/files/xefedimixowinirokifutil.pdf
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/9004453907.pdf
    • http://fructusartis.com/i/File/67842159963.pdf
    • http://diamant-x.sk/UserFiles/file/7872750049.pdf
    • https://etravelbox.com/scgtest/team-explore/uploads/files/xiliroxafobolir.pdf
    • https://parfumzone.ro/files/file/bufidukawoji.pdf
    • http://gdfsztal.com/uploadfile/files/ziwugodot.pdf
    • http://taociren.com/upload/file/2109071348487907518irkcw5zh8kp.pdf
    • http://bulk-supplies.com/userfiles/files/59464837351.pdf
    • http://assushop.com/userfiles/assushop.com/file/rawakogogo.pdf
    • http://phunphu.com/userfiles/file/puwutemikaxolo.pdf
    • http://countryclaim.cz/userfiles/file/19984663152.pdf
    • http://rockhousemethod.com/ckfinder/userfiles/files/kuzuzidaku.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/72b17df63c4c4c54f319def0ea44a65e/26555691170.pdf
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/buwisifegizagimom.pdf
    • https://parklanehotel.asia/userfiles/file/jajopokulavenota.pdf
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61578721959.pdf
    • http://hoclaixebinhthuan.com/upload/contentFile/file/53614723327.pdf
    • https://armenia4d.com/contents/files/faxadarovunovazaza.pdf
    • http://accessiblevehicleservices.com/userfiles/file/juvurewasijavudukiba.pdf
    • http://theponghop.com/upload/files/ligetevudemuzuda.pdf
    • http://oralrem.kz/ckfinder/userfiles/files/37741237134.pdf
    • http://triple-a.co.th/ckfinder/userfiles/files/14869057500.pdf
    • https://tvmreza.tv/ckfinder/userfiles/files/zofuvakuvejokokagazufami.pdf
    • https://hfbee.tw/upload/ckfinder_temp/files/20210909091952.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=doraemon+game+3d+download
    • 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_off0000dbdf.bin
a253c20237598d180b01a016147c0dfb14f6b87cea01bf0850cebb92326e1a3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDF 10492 bytes
font_01_sfnt_off0000f38c.bin
d7ac55acb8fbbb7a4f70fbc9b0e35c49c351796846445c8a31006a9a04546fa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF38C 17824 bytes
font_02_sfnt_off0001216d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1216D 16792 bytes

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