Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed6ff705f8083049…

MALICIOUS

PDF

70.0 KB Created: 2021-10-06 21:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 6a47aeafb598548aed2eb68c9a2efb6c SHA-1: fe8e9920a7f2f8635f75d0fc21b783421b6c0b34 SHA-256: ed6ff705f808304958b5e6e5413615e098ec9d767aadfca709fc5920e357638e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to unknown domains and are structured to appear as downloadable files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high number of distinct hosts and links, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the nature of the URLs and the ML classifier's high confidence score point towards a malicious phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://cu-mbc.com/ckfinder/userfiles/files/94643465701.pdf In PDF document text
    • http://booklandbooks.com/userfiles/file/xewazedikulinururigufon.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/defezufejujewisexomifafu.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/bujufojokadokiwimenajuruf.pdfIn PDF document text
    • https://serka.com/serka/upload/files/gironutozurusekogunin.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/28324958340.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/43102186959.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/zuludetalana.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/xamejawemerikijenuluvota.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/wasajinuvipawudawi.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/zikagukakifemilo.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9d30e977f---84841964902.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/2377952343.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/58651217653.pdfIn PDF document text
    • https://masukpt2.com/contents/files/nodudenozokesukuwowowi.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/pezirive.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/nenitotevodugorujobakoju.pdfIn PDF document text
    • http://hoachattn.com/image/files/nexododudusaniv.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/54940301424.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/10018853361.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/ladefo.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/6835362532.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sovotokajevazegogitominal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+add+your+own+emoji+to+your+keyboardPDF 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_off0000b345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB345 10848 bytes
SHA-256: e43dddc4777b983f14922f6b51c99952d737241d0a4d29ebd5acfb86126d09ab
font_01_sfnt_off0000cc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45D 15048 bytes
SHA-256: 0603b90e71f7e52bb0a8e8906b19d0a68f5e1ff3657eb377ba54f4dd4a7c5ef8