Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5f612a13626d8c…

MALICIOUS

PDF

69.8 KB Created: 2021-10-02 22:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: df5a874980f3c7baed8fb8f0146d430e SHA-1: c926ac5e77aee9400bd534adfb895878458f9c9a SHA-256: bd5f612a13626d8c4d926b510fc6a3f5d7de801cbe245f19c5e091123443a66a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JS points to T1059.007, and the nature of the file suggests it was delivered as an attachment, aligning with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://queure.ru/uplcv?utm_term=adult+children+of+emotionally+immature+parents+free+pdf PDF link annotation
    • https://egyediajandekotletek.hu/mvc/userfiles/file/17478174291.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f795bea554---bezuriruweranive.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/t8tc5h44f3bjtlo5jpqc3u4nu5/33293171635.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/28164731015.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/xabibusaruvudusuj.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/lexotejesixifog.pdfIn PDF document text
    • http://sartor.ru/upload/files/47927359895.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/xalawakof.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/xoniwazidekatexixuv.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/22894965830.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/35637684143.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/lilatobumovumo.pdfIn PDF document text
    • https://aildf.in/userfiles/file/lojif.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/xafalubugugakiw.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/11101399058.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/nukagomegu.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/jewifejuw.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/bopirazijevopu.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/9472862118.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/wovepodibonulexox.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/gowibosuwox.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210921144319.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/48161784959.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/pevamuzigolatezeredef.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_off0000b230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB230 14644 bytes
SHA-256: f0bf0cc433ebefd339880f246a5877f95a5f0c4334767de73316d92caafdea73
font_01_sfnt_off0000d6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B3 11080 bytes
SHA-256: e9bb4a117b6bc4c892273f361fe82e81ecfef5ccd6abb2a9832ee781264c8648
font_02_sfnt_off0000f063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF063 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1