Malicious PDF — malware analysis report

Static analysis result for SHA-256 b014b6d6c851c251…

MALICIOUS

PDF

74.2 KB Created: 2021-09-18 22:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 187bd85a343a549f94bd7c7ee32b5de9 SHA-1: 4f06cf1cbac26c7f9f5ea7dc50c49b46a76b44ea SHA-256: b014b6d6c851c2515db4596544094361640df7ce8af5c1c2d1a1eff9e10df26b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many pointing to disposable hosting, indicating a link farm or redirection scheme. ClamAV detection and ML classification confirm its malicious nature, likely for phishing or malware distribution. The presence of embedded URLs suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=jesus+bleibet+meine+freude+pdf PDF link annotation
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/bd779d0dddda36a0f3016aca5b8e85cc/16749938436.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/juvinugufexapisutimebutim.pdfIn PDF document text
    • http://tabletopad.com/images/file/70402079711.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/veluperazatuxel.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/miluna.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210904075153.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/48686173501.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/fojarega.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/57943326669.pdfIn PDF document text
    • https://davnosti.ru/upload/sanivosid.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/96488351687.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/7049320623.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/68161081989.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/96068564293.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136968f2748c---40212802330.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/fanudodivatolinalam.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/teligarerogeli.pdfIn PDF document text
    • http://ranchobg.com/img/file/34741772173.pdfIn PDF document text
    • http://timocomputer.cz/files/file/meweduf.pdfIn PDF document text
    • https://vleek.com/uploads/files/10019914619.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/90533592958.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/94748144544.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_off0000bd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1E 10608 bytes
SHA-256: 333516eb45d61620d269c9718f41ff237e3919d37c248e66f607a0fd815e4d57
font_01_sfnt_off0000d517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED29 18276 bytes
SHA-256: d596ec8360f8242d8d14d33c4cef3480d28e9df38531426a48166f4d14817841

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