Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe2b5da01d5909d…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 00:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 57f92d69764d35a5323f566bd1d05de5 SHA-1: eeffd66b1e4f3fe68dabe96ae990fc5a774674f0 SHA-256: 9fe2b5da01d5909dc9a2d4c0257e2d709460331dd956232b8b1bc45ada251fb5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://josquin-capella.de/download/93921074050.pdf In PDF document text
    • http://cafesezony.ru/fck_editor_files/files/61545011925.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/31782378532.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/tizuwinu.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/a369d0e1d69933ec359eee03721ff969/lujibunabosaged.pdfIn PDF document text
    • http://sjhtractor.com/d/files/zifaxurabajajamaruxu.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/91736159910.pdfIn PDF document text
    • https://superlitefan.com/uploads/files/60278771238.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/49792595507.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/87359496737.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133fc959a026---25761844528.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/82610686331.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/84693691882.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/duwigirabafi.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/kivuwudepotiri.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/lanujaw.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/66743851542.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/lekupebokobewaloworuxo.pdfIn PDF document text
    • https://ms01bet.net/contents/files/luzuxelojipepakapiwa.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/rujinos.pdfIn PDF document text
    • https://membermimpi.com/contents/files/vemuwatimuwug.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210912_145700.pdfIn PDF document text
    • https://egf.tw/test2/images/file/vuduvosadajid.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/vaxak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=caller+name+announcer+pro+mod+apkPDF 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_off0000d371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD371 10540 bytes
SHA-256: 1ff2b32c932e98f6969818122ef0d0bb068120fa2bffe7a3537e49ea09b5a944
font_01_sfnt_off0000eb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10376 19708 bytes
SHA-256: 5c6cd51cefdd90906348521d026514387c79a9d78e9168e8f50c308d08dd47e5

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