Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc59f31185e3d4d2…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 18:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 660ce212a50faf346392791946884e5e SHA-1: bfecc75a9e7df6241bb8c499ff06967ff11e247c SHA-256: bc59f31185e3d4d225a6bdb8c9a9917322edd137d09248cac125ebf681cd5bd2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with a critical ClamAV detection and a high ML score indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is part of a link farm, likely to distribute further malicious content or phish for credentials. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://1666-3668.com/attach/userfiles/file/gamanenot.pdf In PDF document text
    • http://theexplorerthai.com/userfiles/files/18869731733.pdfIn PDF document text
    • http://xhzhengli.com/upload/bakivupeseb.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/30833310341.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/vowimova.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/serezuvatarifuwu.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/7104680007.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/vivasejubugugitaxebakotug.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/ratotixominuvaw.pdfIn PDF document text
    • http://arsvet.ru/img/upload/mowilejomilarutawedi.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/20111573536.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/mezelupupuzuwamejul.pdfIn PDF document text
    • http://taociren.com/upload/file/21091014375566412734jkpo3n1esf.pdfIn PDF document text
    • http://lejuriste.ru/files/file/37778890545.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/27490982749.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/ruweguforop.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/17475431981.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/siwufetug.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/62217897303.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/d18squcj991fiv1uoa6rbn8o12/66895762884.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/kabanupix.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/82922216820.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1631528628718770076.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/50531779307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+get+live+photo+wallpaper+on+iphone+sePDF 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_off0000d197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD197 10672 bytes
SHA-256: 1918805a3b0e1aac88d60f8f63d2bfd5959c188a33498ba6566001f06c625276
font_01_sfnt_off0000ea0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0C 19116 bytes
SHA-256: 2509238a01b10e1ef76799a96b5f067f77ff3d215eb9def12df4b740ac0a6938
font_02_sfnt_off00011bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1