Malicious PDF — malware analysis report

Static analysis result for SHA-256 c01ea06d480df67c…

MALICIOUS

PDF

71.2 KB Created: 2021-10-11 09:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 96c83eab33c11c1dffa2056816a21175 SHA-1: 56567687bd77ff3320bf3468aa5718384b40c448 SHA-256: c01ea06d480df67c64fbdaa9f143de7a011a3fa81b669529156331571fef019d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were directly extracted, the PDF structure and the presence of many external links suggest it's designed to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://zafirkort.com/uploads/files/lilubim.pdf In PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/11728669556.pdfIn PDF document text
    • https://www.aspart.ro/ckfinder/userfiles/files/kojumifejox.pdfIn PDF document text
    • http://sinners-party.de/media/file/95396581365.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/22903772101.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/lelufugunefaz.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/jejukisudolizadinitodole.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/39183937200.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/93395417781.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/91064567275.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/63120793156.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16149737d4c09e---nuvovixopidon.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/kawirorewimegakuxeboxe.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/wajum.pdfIn PDF document text
    • http://prosquash.by/data/rorabizitoniwidar.pdfIn PDF document text
    • http://fitviewer.de/files/file/60911188647.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/96272199278.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/mapubidizow.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/19135694743.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/pisobipiz.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/8be67ba9a8617e6a6d2490c8b52fc35a/ralavedaf.pdfIn PDF document text
    • http://blueyee.com/upload/file/051848041622.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210926091510.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/051613242742.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/sonunegerogogagofobof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=football+pitch+square+metresPDF 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_off0000b7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EB 15232 bytes
SHA-256: 179d4bc6535ff1add72e9d2f25341ca50fe360e7ea580fdabee5d630ae6b233a
font_01_sfnt_off0000de6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF683 10900 bytes
SHA-256: 288dee7787a42960a1da3cb57b8a9359b4a21c50b7c7b6b2fb49a8d54b564e5c

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