Malicious PDF — malware analysis report

Static analysis result for SHA-256 7832d29fe73b3dcd…

MALICIOUS

PDF

91.5 KB Created: 2021-10-07 11:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 72a4b7cd95e2ee5fe546b25d72dd36d1 SHA-1: 2834472c76c93202cd11c75fa9f4a1889580028f SHA-256: 7832d29fe73b3dcdfb4a33e2e411487fcb68662bf0c0d0028593f0b4792a3755
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects to external URLs, as suggested by the PDF_URI and EMBEDDED_URL heuristics, which are often used for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/82b3ab3f1f3789cae564419ed895be25/74091985971.pdf In PDF document text
    • http://duetsepolno.pl/userfiles/file/firevejuzulipago.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210902_FCDD03B1304E99FB.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/46846705240.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/xevomogatasujuponojipug.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/sovemexivamuji.pdfIn PDF document text
    • https://brakos.it/file/39861519631.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/nurijowugakimu.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109242119056503.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/74360304178.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/33310684584.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/leridalutubimalipene.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/xisepotoxotuv.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/59942480778.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/25011805683.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/bexereranopugakim.pdfIn PDF document text
    • https://superlitefan.com/uploads/files/dagiwuvozojujanakadop.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/79658521547.pdfIn PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/debopekav.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/4758364776.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/74507134863.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/37411727394.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/nutasubabojatasedurexumaz.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/dcf631001574be0c293630955885067c/dasixapatefowulovavewira.pdfIn PDF document text
    • http://eko-uklid.com/files/file/diloroxivedepo.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/pozokemalolase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=goulash+made+with+tomato+juicePDF 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_off0000f8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B8 10784 bytes
SHA-256: 01e85f3bbee156371a8d5215f4ac5df442445543f8a5fbbef10bbc323e5fd7ee
font_01_sfnt_off00011193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11193 21056 bytes
SHA-256: 0f4ae082b27c778f6b79edd0548ff408b690b946b1bbbfba11f3c8b9a3613295
font_02_sfnt_off00014802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1