Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd386900c6b6a82d…

MALICIOUS

PDF

70.2 KB Created: 2021-09-24 14:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf2a0249331f64fb106276c14f9ffebc SHA-1: 81f89c9636df689409391acb245b8ba84436bc49 SHA-256: bd386900c6b6a82db82c2005aa642fc3fc2128cb063040a6b1b79a4c9f3671d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting and acting as a link farm, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://pixomot.ru/uplcv?utm_term=harry+potter+and+the+ministry+of+magic
    • http://1utilaje.ro/mm/file/13279609230.pdf
    • https://eksiliotomotiv.com/upload/ckfinder/files/texutifosip.pdf
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/pexutakedifaneriwiwad.pdf
    • http://haohanlegend.com/Uploadfiles/files/zawitesusepopuzonovujiz.pdf
    • http://sadiqandsons.com/userfiles/files/rolodaragir.pdf
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/ferizos.pdf
    • http://vietcem.vn/public/default/ckeditor/files/puligugavosoduramikeso.pdf
    • http://daearesort.com/FileData/ckfinder/files/20210909_D862BC6593B777D4.pdf
    • https://procogs.com/FCKeditor/file/regera.pdf
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/zemisirigabigozikeleg.pdf
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/zigadojelojubolebikofad.pdf
    • http://noithatnhapkhaugiasi.com/luutru/files/22971485302.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161375c1a2c421---luwelebamokugas.pdf
    • http://futsalcb.cz/picture/vtextu/file/dewazobevufajenobumo.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/341475fb2bb6c589e3d506a347eff856/bolavuj.pdf
    • https://gryf-wet.pl/ckfinder/userfiles/files/fejaga.pdf
    • http://italy-ex.com/images/blog/file/jekarenoni.pdf
    • http://ebiocell.com/uploadfile/file///2021090515021197.pdf
    • https://csodamalom.hu/files/files/63838714977.pdf
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/soxixade.pdf
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/26707007805.pdf
    • http://cyuanmei.com/userfiles/file/dupogiterowurovusovu.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/2489910529.pdf
    • http://apsara.ru/userfiles/file/87232017547.pdf
    • http://budka39.ru/files/54016711741.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_off0000b1a9.bin
679a325d62ef63e065370a6ca98b435d8cec076479ccc8bb2157247fb2875bbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A9 11124 bytes
font_01_sfnt_off0000cb3a.bin
85e902ab442a5a71c3428b687307bb736d4bd84621a03c9f0aa2056443ef3512		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3A 15756 bytes
font_02_sfnt_off0000f309.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF309 16792 bytes

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