Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0e47a619ff1e1f4…

MALICIOUS

PDF

74.6 KB Created: 2021-09-15 16:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 653a941912e29b44dbaa3b1eaafe2b68 SHA-1: 4acb918a2002f58284470fa3c0082ddbd20a8687 SHA-256: f0e47a619ff1e1f408412215bfa87f020eb4276c0fd929156635f17a3612f2df
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of links to distinct hosts, suggesting an attempt to obscure the true malicious destination or to distribute malware through a network of compromised sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://malinaionescu.ro/userfiles/file/zafixujegola.pdf
    • https://hurghadalife.net/userfiles/files/17294972796.pdf
    • https://chsins.tw/uploads/files/202109151504159696.pdf
    • https://sahodayabbsr.com/test/fckeditor/file/94203261919.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d346547ad87e091dbc350e321a57f8b6/dixururigepilibedon.pdf
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/23040347657.pdf
    • http://marine-inox.com/i/File/30664366983.pdf
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/68447284987.pdf
    • http://lynxauto.ru/userfiles/file/didapu.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390fd93bb94---6054653989.pdf
    • http://studiomanzella.com/userfiles/files/bisokup.pdf
    • http://oishisushigd.com/uploads/files/68379734439.pdf
    • http://mcap.cz/images/uploadedimages/file/29119255058.pdf
    • https://kalashad.com/userfiles/file/xutoxivuloxupotep.pdf
    • http://k-ookuma.com/js/upload/files/39903862835.pdf
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/9447598385.pdf
    • http://aaz.sk/editor_uploads/files/zububikopikodaduzagad.pdf
    • https://florissantdesign.nl/docs/Image/file/vebajesovoben.pdf
    • http://111-orte.com/testarea/cwsCMSlight/media/files/79753614939.pdf
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/vawujeri.pdf
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/43736326378.pdf
    • http://ngnjl.com/userfiles/files/vamumovusuraporoveperudo.pdf
    • https://sainaudit.mn/File/3039566368.pdf
    • http://yourtruck.be/upload/ckeditor/file/nuxosigediw.pdf
    • http://z-sinpro.com/upload/files/kinufotifatupipu.pdf
    • https://wronba.pl/uploads/wysiwyg/file/12647985474.pdf
    • https://carsen.sk/editor_uploads/system/files/kafapodelu.pdf
    • http://gocchame.vn/app/webroot/img/uploads/files/museresusuru.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=android+data+eraser+for+pc+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_off0000c028.bin
346dae8677596a810ed4993ef35d87b061b2a1b0b2264262936310c9ddcde224		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC028 16928 bytes
font_01_sfnt_off0000ebe4.bin
28b325182cc815d9b44ef13d5b248a283c3d17440343108059d5ac73e76602a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE4 10680 bytes
font_02_sfnt_off00010494.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10494 16792 bytes

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