Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6099e8ca594d93…

MALICIOUS

PDF

88.0 KB Created: 2021-09-17 03:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0d5dcfaab9b44bff7e17812935bf26bd SHA-1: 324a98a5e265c965b9195ff3b02d16a004dc411a SHA-256: 6b6099e8ca594d9384e5297fdaffc321a921b81cb8a4177876898ad5f4129c90
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains or link farms, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript (T1059.007) indicates an attempt to execute code within the document, likely to redirect the user or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://sklepbonus.pl/userfiles/file/kakosexosad.pdf In PDF document text
    • https://proxus.nl/file/kawikowoze.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/xujerelelejazopejarelod.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/zatubem.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/zarujifejefisuno.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16136491c8fc2b---34261473074.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/73264632991.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/48455872067.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/tinatob.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/tokoderedamudasa.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/mepare.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/42440077966.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/baxafoda.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/23972067089.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/monifolovop.pdfIn PDF document text
    • http://veitali.com/upload/files/25346821754.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/tidemugokenujapebavi.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210911_EF6083F0463763C3.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/77226678207.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/29027953697.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/45698489370.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/47834686749.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/doraxikofijifopoveb.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/a0be09f0421b40d8526101f1d094f709/1202616526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=auto+message+sender+androidPDF 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_off0000f2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 10624 bytes
SHA-256: ebc76f922f0f961b95a4209c0ca71dfbb2ffcc54920ee2573887835348a6fedc
font_01_sfnt_off00010af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12307 17992 bytes
SHA-256: 1f0a9aa171cf48a1fbdc472354416ce3fe2fc0e44a4db6c7d6639192501c0541