Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3331504db10ed85…

MALICIOUS

PDF

80.6 KB Created: 2021-09-20 07:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0c0e046916ab45158651b23a4fe824a1 SHA-1: a5d0501e697529d84268a1a59f96468c9e787517 SHA-256: b3331504db10ed85c23b17e0410b4e1627d2d0c3a30bb1a7b9b3995f411eea75
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://mnogonomerov.ru/uploads/file/4887040582.pdf In PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4158318988.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/binowibimegizamiginisunob.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/vumixesopufirugejedi.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/wosokafuzimopubenagaso.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/59465351748.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/ramudubiw.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/noduzuv.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/7515922501.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/85103231989.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/zufomi.pdfIn PDF document text
    • http://headrepublic.pl/images/files/72805689771.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/xebaropetonez.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/33050fa2032e40869b0776846c729414/gefotafewu.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/papuvatosalamebuvobox.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/81589995742.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/72303918708.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/kegovibufivotodi.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/68963497494.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135509e1b2ef---13512642134.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/batogiso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=god+of+war+saga+isoPDF 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_off0000d8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D2 17280 bytes
SHA-256: 876538c93af1913791150fd8f8e206077d8d9ac5ef49b64bafce48f9a8f88d29
font_02_sfnt_off00011df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF5 10276 bytes
SHA-256: 80559185880e31923be015656cb248878cb45afcdaa975b0c13697cf0c93194b

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