Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee63365b17b379b6…

MALICIOUS

PDF

70.4 KB Created: 2021-09-17 14:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c362513eacd3d1d5318d06fd195f741 SHA-1: 2cddacc7283d7465a3cc92aef6550d55bff21a78 SHA-256: ee63365b17b379b64d710373f5e0464de05b9d96cc17c8bda1d2726f4a89cdb9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating a potential for malicious execution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous extracted URLs suggest an attempt to distribute or link to malicious content, possibly for phishing or malware delivery. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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 http://www.ferm-matic.fr/upload/file/99226491207.pdf
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/vagunufosifagetarulopidaz.pdf
    • https://eguiders.com/uploads/26540529174.pdf
    • http://keyflounge.nl/userfiles/file/nuzakagideworudagifizuger.pdf
    • https://asset-books.com/userfiles/file/negarup.pdf
    • http://chaukitchen.com/uploads/files/gikib.pdf
    • http://ecompletecontact.com/ckfinder/userfiles/files/fusalarufe.pdf
    • http://kielcenoca.pl/files/file/gedimesowaxazediva.pdf
    • http://vietsaovang.com/uploads/userfiles/file/fudomujasetatobilowoxa.pdf
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/gezubakuwonoxenodib.pdf
    • http://a-kamen.com/userfiles/file/lisesuvanijuzize.pdf
    • https://igescanada.com/ckfinder/userfiles/files/74877719363.pdf
    • https://aakritidigitals.com/userfiles/files/55264746370.pdf
    • http://abwlondonblvd.com/uploads/files/gesedikarubazufedu.pdf
    • http://hotelclinton.it/userfiles/files/logenalexifuranutirivubes.pdf
    • http://estatepie.com/files/userfiles/file/5459397829.pdf
    • http://pi-consulting.ch/download/40331341343.pdf
    • http://tieulongcopro.com/luutru/files/zeninemile.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613df162b567e---kifakupiko.pdf
    • http://tatnhapkhau.com/ckfinder/userfiles/files/39033197218.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/6b786cf989e32cff7314fef843cabc99/49868043111.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=download+cricket+games+for+android+phone
    • 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_off0000b2bf.bin
a11046e21bb22fc9363cf2d2dbebd789f6cc85600394b39c05030e046d8edf0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BF 15336 bytes
font_01_sfnt_off0000d9c2.bin
c7ebe11cbc316ab3dc3ecde5e12bb66716adf85efa4c08b9728a42736decbd6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C2 11244 bytes
font_02_sfnt_off0000f3c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C9 16792 bytes

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