Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fc0702bac0c30ac…

MALICIOUS

PDF

74.7 KB Created: 2021-06-09 01:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71f51bd2262477c006f09acf2edc9f11 SHA-1: decf4caba28d0d451f469a495fa0f4864553fb5c SHA-256: 2fc0702bac0c30ac6dfe9ba1cd4fa59deb509b8891d9cb059d96c311e4b642b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains embedded URLs and is flagged by heuristics as a link farm and a phishing/malicious document. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary URL, 'https://chcial.ru/pbw?utm_term=gottman+affair+recovery', appears to be the intended destination for the lure, while other URLs are part of a link farm to obscure the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://chcial.ru/pbw?utm_term=gottman+affair+recovery
    • https://static.s123-cdn-static.com/uploads/4409122/normal_5ffdbeb560f2b.pdf
    • https://famatogovux.weebly.com/uploads/1/3/4/6/134614416/lazawediru.pdf
    • https://zaximasuxudaris.weebly.com/uploads/1/3/4/5/134590642/79e6328.pdf
    • https://static.s123-cdn-static-d.com/uploads/4382408/normal_60b5d38ae6f6b.pdf
    • https://tujeliwavujojow.weebly.com/uploads/1/3/5/3/135304707/vupupimar.pdf
    • https://pamibatofenowa.weebly.com/uploads/1/3/4/5/134525539/6990034.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wotasaful.pbworks.com/w/file/fetch/144628950/amplificador_qsc_rmx_1450_caracteristicas.pdf
    • https://uploads.strikinglycdn.com/files/81ff33f3-bc36-4c60-aec6-68644127a2b1/python_programming_video_tutorials_free_download.pdf
    • http://gufabewa.pbworks.com/w/file/fetch/144454161/what_to_say_to_my_parents_on_their_anniversary.pdf
    • http://pitavumiza.pbworks.com/f/63052328762.pdf
    • https://uploads.strikinglycdn.com/files/bca863e2-cfb7-4347-b56e-633bf3162d32/nikogopekutano.pdf
    • https://uploads.strikinglycdn.com/files/efc0383a-769f-46d2-8365-e50fff4ee42c/5500959665.pdf
    • http://sijomirurefi.pbworks.com/f/17437663409.pdf
    • http://nitezug.pbworks.com/w/file/fetch/144670956/84719529329.pdf
    • http://zivovot.pbworks.com/w/file/fetch/144631575/radakojaretaletewoxuzatod.pdf
    • http://mijatonevu.pbworks.com/f/55314474580.pdf
    • http://nipekari.pbworks.com/f/rumak.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6db.bin
18802f2c82d7e422425f614b8687970f3d9d251dccd48d55ec48f288d9366039		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DB 5008 bytes
font_01_sfnt_off0000f7e1.bin
5957b7abb5c29a3ec1ed2c76b082351cc0e1489cf5dbf631891aec17bf5d693a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E1 11344 bytes

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