Malicious PDF — malware analysis report

Static analysis result for SHA-256 af69a4119b136420…

MALICIOUS

PDF

79.7 KB Created: 2021-09-11 18:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 105a2baf7adaf4f6d4c164c780e898fb SHA-1: 5d5f8729232e8695f21e85551f65d3e95aa2981e SHA-256: af69a4119b136420827dcbaff10106cefb80edc1d7829cc0d6bce145b57d2fd0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and URL distribution are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://unternehmensberatung-hegenbarth.de/userfiles/file/foralobirivos.pdf In PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/63752007337.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/widuvafusikukokebefebe.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/17581812284.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312a554bd6e---muguwefidoneta.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/55307227539.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/66782056768.pdfIn PDF document text
    • http://www.agot.pl/upload/file/17878695814.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/42555391524.pdfIn PDF document text
    • https://baptistfriends.org/media/kuwamepapibep.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/wanozoruzux.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613a78887347c---77800353902.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/vixebonutebuwizajon.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/6412385189.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/pegubi.pdfIn PDF document text
    • http://grandviewcommunity.com/userimages/fivijelipexenesegefukit.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/3883186307.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/97102620274.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3465365440.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/weratapuvapipeb.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/pupekuput.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/42090224261.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/43932052215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=skills+hack+pubg+mobilePDF 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_off0000d2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C8 10924 bytes
SHA-256: 90ae8389e07dd1f8cc15b00af21b42908ef8b517ede232e1a7c693a8a1f70518
font_01_sfnt_off0000ebd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD3 17356 bytes
SHA-256: 3191eb6ff80b5a0352f744d7a90c81aea2c1017d60da2f71c7516fb83eea47bb
font_02_sfnt_off00011856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11856 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1