Malicious PDF — malware analysis report

Static analysis result for SHA-256 42214b086947bd3a…

MALICIOUS

PDF

85.7 KB Created: 2021-09-12 12:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d3f21084f8964f772552c44946bc7409 SHA-1: 2b1d6e8f42017197368ef7d813d467d4047441fb SHA-256: 42214b086947bd3a4fc6b0035b7c3b3a814291cbca50e4fc2d91a0110b99f7d1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a phishing or link-farming attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://grandrosso.com/js/upload/files/fanozame.pdf In PDF document text
    • http://usateatop.com/_upload/files/11003421290.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/76352285364.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136964ea7847---30532927475.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/97430587185.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/49563304789.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/xejosonomijax.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/89512736761.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/2039392036.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/42978289544.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/jawopavovezukusamajulage.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/talapotevaxenowawepapa.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/majetevusajawukekizavapek.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/49091916939.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/lijexivij.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/aio92crgm6d0aarrdd7ngng5j7/57243069539.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/jibopozeregoleligimufun.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/gawazokojaxal.pdfIn PDF document text
    • http://portableandcool.com/files/files/86239781101.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/peduluvotor.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/78893761547.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/dazevanasududigalotaba.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/wubamediruxabilufezot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=game+of+thrones+pdf+book+2PDF 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_off0000eaa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA8 17576 bytes
SHA-256: 6cc48c5fcb55ed4514d27be785551ac9069978375269f2078b2b218fca0e750b
font_01_sfnt_off000117db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DB 11016 bytes
SHA-256: 91426e51d46a68bed12b3f44603a32052fd998fb487a3ec922e14cc12d32fba8
font_02_sfnt_off00013124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13124 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1