Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea5709f68c609f9b…

MALICIOUS

PDF

69.2 KB Created: 2021-10-01 14:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6bb1e977ade3969cbbbdf728192e5ff7 SHA-1: 26320b026eeea17fbf7fa300ecfe43de67bc1106 SHA-256: ea5709f68c609f9b8c8b12c2bdf1fcb2ab392740f2060551b802a4cc381eca00
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and external URI firings suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://laborke.ru/uplcv?utm_term=a+tale+of+love+1996+movie PDF link annotation
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/54425849861.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210926180746.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/mijisagux.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/69398254688.pdfIn PDF document text
    • https://thietbigas.net/media/files/61857876154.pdfIn PDF document text
    • http://offokin.ru/sites/default/files/file/60822469662.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/1784819317.pdfIn PDF document text
    • http://linza-market.ru/upload/files/lulotuvujamefaj.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/lewazedemosizelana.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/32762521838.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/97907959350.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/66712249997.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/tapupawosoxux.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/fupewelamum.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/42705711386.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/4632117712.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161312ae30a7da---boxevi.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/gitexeneraselagijuruwo.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/8232113208.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/93802815018.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/89459656332.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/0a52e8c7732046275692654c88579bd0/zodexijefiritoj.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/1432600550.pdfIn PDF document text
    • http://elsped.hu/files/file/getovejazopovep.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_off0000b123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB123 10436 bytes
SHA-256: 3f1cf52eb27af901c83e86738181b7f724d955d2d925407f62cf6c2fe6b3d020
font_01_sfnt_off0000c8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DF 14512 bytes
SHA-256: 4ad63dbe9418bd47713174822a274a875c2d8e6d309d573d2dbb665d774f3a74
font_02_sfnt_off0000ed03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1