Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fcb999b11371654…

MALICIOUS

PDF

76.6 KB Created: 2021-09-15 17:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 87c7205b26a1472fe74a535bc45fb98e SHA-1: 2b6c5df5e0b6eedfc60ba30d78cab5f57058e947 SHA-256: 8fcb999b11371654643b6cc5358c5d41718f2fa3e3810c770ce603c61e868eef
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate effort to obscure the true destination through a large number of low-reputation links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://pixomot.ru/uplcv?utm_term=age+of+war+unblocked PDF link annotation
    • http://jyjwqj.com/uploadfile/file///2021090601481853.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/pufilorudatu.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/wizogosakurovut.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/xaxesujipufogatax.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/90592334797.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/58949688712.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/zapaso.pdfIn PDF document text
    • http://praguetransfer.com/files/file/1156222278.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140826be157e---19823938300.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/vukibokuxugaw.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/37667038568.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/nuzijox.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/vawolexezosuvutorov.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/85194520628.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/tulapaweboxawavofogipopor.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/44229869005.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/83075098000.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/49363623146.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/zanex.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/96268467161.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/1b77d2d1550bea4824c4df141b3af048/farojeletu.pdfIn PDF document text
    • 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_off0000c8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BD 10692 bytes
SHA-256: 1e3e7f1ff6f2ab1a50d58e4a1eae2a5a10dc3a6e8ea6bb653aa74bc936a57112
font_01_sfnt_off0000e145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE145 17152 bytes
SHA-256: ac9e9901217a52c7193383fb7ed472fa480e9d9a844b3ae323ce3f2c558e1c37
font_02_sfnt_off00010d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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