Malicious PDF — malware analysis report

Static analysis result for SHA-256 39bf0e8bd181220e…

MALICIOUS

PDF

84.3 KB Created: 2021-09-14 13:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 517a766e6a69fcdf0b399de5da9e1e05 SHA-1: 16e00f98992fddb788bb50f592910237842f1da0 SHA-256: 39bf0e8bd181220ea9aa8cc48d76b4549174fda11ad81c2e2f52f9b4510dbc71
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 pointing to various domains, many of which are structured to appear as file uploads or content delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using many distinct hosts with few links per host, suggesting an attempt to obscure malicious activity or distribute payloads across a wide, disposable infrastructure. No scripts were extracted from this sample, but the presence of numerous external links strongly suggests a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=which+country+has+the+highest+area
    • http://nemeckystrakac.sk/editor_uploads/files/21609934385.pdf
    • https://isabellepieman.com/userfiles/file/66735668584.pdf
    • https://wmu24.ru/media/file/61752513269.pdf
    • http://z-sinpro.com/upload/files/50733653579.pdf
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/selum.pdf
    • https://5a.ro/ckfinder/userfiles/files/dajomojukibafejuz.pdf
    • http://bjsixiang.com/jingkelun/userfiles/files/20210914082935.pdf
    • http://togclick.com/media/userFckfiles/file/65823503077.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4fd439a00---36652728007.pdf
    • http://52963566.com/upload/file/202109131835565498.pdf
    • https://uleshuzataruhaz.hu/files/file/78133516588.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efa7461598---beguniko.pdf
    • http://abbeytraining.net/userfiles/file/40330977320.pdf
    • http://fuyu.010bi.com/ckfinder/userfiles/files/16928373049.pdf
    • http://myapartment.de/web/editor/files/mutigevomupej.pdf
    • https://mantyobras.com/userfiles/file/72433058201.pdf
    • http://camberwelltaxi.com/survey/userfiles/files/89926232573.pdf
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/donusugofikux.pdf
    • https://detectiveoffice.net/userfiles/file/99600638851.pdf
    • http://sibstroiexp.ru/userfiles/file/pijuloguviwomovutara.pdf
    • https://wic-net.com/userfiles/file/kowoja.pdf
    • http://x04ydivan.ru/userfiles/file/71325824506.pdf
    • https://konteshamamotu.com/userfiles/file/51612760609.pdf
    • 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_off0000e57f.bin
1a3eee9965e43f747aa4824bb80c43130e1364cdf360df32839846f31f986f2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE57F 17760 bytes
font_01_sfnt_off0001136f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1136F 16792 bytes
font_02_sfnt_off00012b86.bin
b0b33bfbbcac6c8f36e69beae0aa2bf61e953b1bdba075f2737a721e11896bac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B86 10672 bytes

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