Malicious PDF — malware analysis report

Static analysis result for SHA-256 658b4e8a16ca88c7…

MALICIOUS

PDF

78.7 KB Created: 2021-03-02 19:39:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 986f0dd9c2f12abe54776e4784d88966 SHA-1: c9329d1391fffc9655fc750162c948221f7e67b8 SHA-256: 658b4e8a16ca88c7e263aab56f8eb741dc4965f60cc568bfa0fa523c0e54ab85
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/wix?keyword=kung+fu+bow PDF link annotation
    • http://taxevidel.medianewsonline.com/rajewuwomukake.pdfIn PDF document text
    • http://50offshop.info/movie_box_jailbreak_ios_1150847.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/34170367290.pdfIn PDF document text
    • http://juwaniwabi.medianewsonline.com/dumajelokuvupesazemabuzop.pdfIn PDF document text
    • http://wow50.pro/45183568374ca3ls.pdfIn PDF document text
    • https://cdn.sqhk.co/popenewosaso/ifKjdGX/avatar_creator_apple.pdfIn PDF document text
    • https://cdn.sqhk.co/bofilewidil/K26hchg/10033171621.pdfIn PDF document text
    • http://rasudilikid.mywebcommunity.org/59094428660.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/17471016838.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/69760164917.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/cursive_worksheet_maker.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF26 8596 bytes
SHA-256: d252cf31a955e2aa15c88f8a83e746e656db2da30478bf254113d93c9af5ab8e
font_01_sfnt_off0000fba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA8 4620 bytes
SHA-256: 38563cce0f119a3a9c726a0591294734781b1c350fa3ed3aae3130dd5ee00c6b
font_02_sfnt_off00010ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA1 10112 bytes
SHA-256: e8bd5e5ba837de3ae274b5b066e71f69ec12348ffb91d2d38042cd291921227d

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