Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52eb379000c8e9f…

MALICIOUS

PDF

82.2 KB Created: 2021-09-10 15:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f4b6ce42c3b102b5da36b20e4129dcab SHA-1: 59d21c2ac2e74c15946878fc1eeff75923bffe2a SHA-256: f52eb379000c8e9fedd63989ce39c0dcc9633dccf61d1c0760df12ce56f5b5ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a link farm designed to redirect users, likely to a malicious download or phishing site. The presence of a 'utm_term=download+gta+san+andreas+for+phone' parameter in one of the URLs suggests a lure for a game download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1baf5fcf6---86108339049.pdf In PDF document text
    • https://debcopharma.com/userfiles/file/bipedufun.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/palikodizevirovuler.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/nosanopasaruteb.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/62834141488.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/vasixatofutefikul.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/gebujebat.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/buluzetutojofipoxev.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/51802532527.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/xawetovimabejujep.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/vajiburupuz.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/47987540332.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b416ab4810---ruturawefemasowaw.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/rubezakogufabosuxi.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/6184794536.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/buguratumo.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/guravafojeponagone.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-7/20210907120322208008.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/49251010406.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/35373994530.pdfIn PDF document text
    • http://artio.pl/files/files/mopifofoxijelumurago.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/redarew.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/69133874289.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/xesedenomijere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=download+gta+san+andreas+for+phonePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CE 10772 bytes
SHA-256: 90b07370c5df094bc9360d571715e31c86277174ebf739bcfb7815d41b6310c5
font_01_sfnt_off0000f26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7F 18720 bytes
SHA-256: a441c8d50141359e8009f17ff3bdbda69aa086f2db183ef2e0137f62faa2d874

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