Malicious PDF — malware analysis report

Static analysis result for SHA-256 6941f8d8b9d72e73…

MALICIOUS

PDF

73.3 KB Created: 2021-09-19 11:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13291ac6d68ab923a4582c687f306b7b SHA-1: 96e62f68dc1cc9b0409229d8a2f6133d5cddfd77 SHA-256: 6941f8d8b9d72e736a72b01b914ec082fede1f017e79e3507973e80728eadf0c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are likely used for malicious purposes, such as phishing or distributing further malware, rather than legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chaukitchen.com/uploads/files/juguvu.pdf
    • http://kancelaria-perfect.pl/app/webroot/media/files/fomevebixujap.pdf
    • https://pharma-tools.pl/galeria/file/riwafopuf.pdf
    • http://hueide.com/upload/files/tupetarajagijuxe.pdf
    • http://kapelski.pl/userfiles/file/86067240153.pdf
    • http://balone.net/_upload/file///5499552194.pdf
    • https://rakowka.pl/userfiles/file/fedoditanatif.pdf
    • http://salon-urody-bellis.pl/images/file/13363358537.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/woketapimuvosaxuzavulev.pdf
    • http://bacvietexpress.com/upload/userfiles/files/lavutidemojib.pdf
    • http://igabana.com/upfolder/e/files/20210914105343.pdf
    • https://gmnavarra.es/ckeditor/files/66375763359.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/722s7h1i20a5uusee0ffjunobv/sogenijatorew.pdf
    • http://mirsistem.com/depo/sayfaresim/file/18625305962.pdf
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/49622625198.pdf
    • http://mg001.cn/upload_fck/file/2021-9-2/20210902195856283319.pdf
    • https://s-h.cc/uploads/files/202109152016313922.pdf
    • http://laureysnv.be/uploads/files/xewanutesurupixukomufa.pdf
    • http://wonderful-foods.net/userfiles/file/mubumokuxowufopim.pdf
    • http://b40555.handyfriendship.com/upload/files/kusemetevagalobuxem.pdf
    • https://llbyggodesign.se/UserFiles/files/bufesogikukusovipunoki.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161444f9a41512---96920436407.pdf
    • http://www.mostenpo.jp/userfiles/files/guxokileritot.pdf
    • http://kechengchem.com/upload/files/27761021379.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=friday+the+13th+the+game+download+apk
    • 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_off0000bd76.bin
d6719eec12c92ca010030d3f7d781e4557d60f0464481101280f938c9a824860		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD76 11164 bytes
font_01_sfnt_off0000d73b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD73B 16792 bytes
font_02_sfnt_off0000ef4d.bin
08dacf2555174220d950745cc1f4d870a088fdfff1adbcf29ce0e9afdb52b4a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4D 15700 bytes

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