Malicious PDF — malware analysis report

Static analysis result for SHA-256 1625bd1cb75ab18f…

MALICIOUS

PDF

73.1 KB Created: 2021-10-02 20:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3bb0e56b6cc603c5877d94f08f0fa527 SHA-1: f33e348d562777b3068b59e92576dfd71e40e2d3 SHA-256: 1625bd1cb75ab18fe574bd7580afff11d894f9370588bd8139c9261cfddbe82a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_URI and EMBEDDED_URL heuristics, which are often used in phishing or malware distribution schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 http://fornacedelia.it/userfiles/files/rofivofijomazuwu.pdf
    • http://gesgo.de/userfiles/file/16683958471.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614ff1f296df5---woluk.pdf
    • https://konteshamamotu.com/userfiles/file/lusibojane.pdf
    • https://trompis-tondschungel.de/userfiles/file/2446534335.pdf
    • https://catequesisnavarra.org/guiarte_userfiles/files/vagonaronetixazonawusu.pdf
    • https://ulsantour.com/FileData/ckfinder/files/20211001_0C4E749A2FE755C1.pdf
    • https://inprovitperu.com/ckfinder/userfiles/files/nizokufiw.pdf
    • http://aimecostruzioni.it/userfiles/files/rodumo.pdf
    • https://galerieportelouise.be/userfiles/files/wopemisepupodubemubibeg.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/08aebfaed6a3509ced4e5aab9b3b5b42/36373906416.pdf
    • http://lso-msm.com/userfiles/file/wirujobedarobifiziveg.pdf
    • http://taxilitomerice.cz/ckfinder/userfiles/files/jelewavasexav.pdf
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/dexegofepebipapaj.pdf
    • https://netron.pt/app/webroot/media/files/lowiro.pdf
    • http://pes.edu.mn/ckfinder/userfiles/files/jozinalot.pdf
    • http://thegioixedap.net/upload/files/tipigenirugekutom.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/71365857843.pdf
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/60881679563.pdf
    • http://baheth24aqari.com/ckfinder/userfiles/files/liganakuneti.pdf
    • http://studiogeologicotrilobite.com/userfiles/files/62711534655.pdf
    • http://astorandblack.net/emailer/userfiles/file/zizadajimoxinesaxa.pdf
    • http://zwickerfoto.hu/_user/file/loxizasezozebo.pdf
    • http://wawa757.com/uploads/files/10651797022.pdf
    • https://millvalley.com/wysiwygfiles/file/zizew.pdf
    • https://sin-wa.tw/app/webroot/userfiles/files/22090983838.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=toy+poodle+mix+for+sale+near+me
    • 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_off0000b723.bin
70f6b87965d3e2aed979a5082763cd262cc805ea4b3ab8ea0c3d22f01c55a41b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB723 10740 bytes
font_01_sfnt_off0000cfc8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC8 16792 bytes
font_02_sfnt_off0000e7da.bin
0e1ded90d176b37566495babdc467bd6a98f6b8c351484ce77fcaed4b434f74f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DA 18072 bytes

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