Malicious PDF — malware analysis report

Static analysis result for SHA-256 0339562b37eb4fe4…

MALICIOUS

PDF

81.5 KB Created: 2021-09-22 21:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5614d66fd8721f16541ce936c5ff120d SHA-1: 4a281026e73b7128161dd15f9ce9f7d69713a630 SHA-256: 0339562b37eb4fe47079c5c2dd5e86415f12bc988b147c3103d0e6471f9c04af
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm, pointing to numerous distinct hosts, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/vobilirifavozu.pdf In PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161443561b925c---6107552251.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/99291697109.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/venulirug.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/virezuneradinogedipexa.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/zurumavomepo.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/30104429130.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/93018349362.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/jikanodasisenuni.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/16951772089.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/rabexomenodogalazovova.pdfIn PDF document text
    • https://makenie.com/upload/files/22836545085.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/vusafegapixugup.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/65821667807.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/73473056420.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/difelasedowejoxan.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/labunobekuv.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/88983e1d92e3119624fe7d8e079c1b28/51547881803.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/bubetedovirimizejitulid.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/2831917996.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=android+sync+app+data+between+devicesPDF 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_off0000d840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD840 18360 bytes
SHA-256: 4bbc792c9f1c14cff214835023594ede7803a143022110623704c7a6a2cc3a85
font_01_sfnt_off0001075e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F75 10848 bytes
SHA-256: 6ab6ce3069b28e0ff76d2a7b4a917b453f0f19ed6fd2ffbed65fcec536ea89dc

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