Malicious PDF — malware analysis report

Static analysis result for SHA-256 b41bc048ad1449fe…

MALICIOUS

PDF

71.6 KB Created: 2021-09-26 15:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1216d609f68542141324de8586f34f89 SHA-1: 47bb3379c61158ad8a602ecc2a5874b919701188 SHA-256: b41bc048ad1449fe0a1f9446ae65829fd08b315140f6813d842bc9b631daab99
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 point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or credential harvesting. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ccshecea.org/upload/files/lisatibep.pdf In PDF document text
    • http://urgentcarepb.net/userfiles/file/zulesewipofukitusaturuwo.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/41671680545.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/50525981629.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/80255902628.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/75691878212.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/3007730706.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/lepugogap.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/33406143751.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/bobumemixekonenowizajixi.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/27469935710.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/13690713791.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/navixexanomarepu.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/rupazemedufa.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/7ef2cd5eadafbb03fba7238046938468/nuselada.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/vavojenuzalipixelunuxen.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/31491021618.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/35137492518.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/kativepifibo.pdfIn PDF document text
    • http://quangcaovuanh.com/vietkiendo/upload/file/wagarupuvenogixuvemov.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/57987778656.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/50835342642.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/jozilabebisisi.pdfIn PDF document text
    • http://abpaluso.com/upload/file/pigujavikirite.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/soponirer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=torque+burnout+downloadPDF 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_off0000b50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB50A 10416 bytes
SHA-256: 336b3ddbf82eee722522dfe6b3ced07ec5a6c3dd3dd0404f52b9c4af75c60b83
font_01_sfnt_off0000cc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC95 17348 bytes
SHA-256: 6e19feaa80cd9d87d1ba62338d7aeb1adf323cae87a1676adee6bd5cffabb46b
font_02_sfnt_off0000f897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF897 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1