Malicious PDF — malware analysis report

Static analysis result for SHA-256 31cd4d33f2871522…

MALICIOUS

PDF

78.5 KB Created: 2021-06-12 20:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: dca5bf38385dab3406e3c08f3e24f786 SHA-1: e002736a9ff9a881fd5e3ff4eabbe5b6d5fde38e SHA-256: 31cd4d33f28715222ceae33d2c4932fb6394f0fcf6c92a08ed6bd4428bb94d87
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with one prominent URL pointing to a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting many small PDFs on disposable domains, suggesting an attempt to distribute malware or phish for credentials. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://synerhu.ru/pbw?utm_term=crazy+racing+car+2+mod+apk PDF link annotation
    • https://fekukutetixamam.weebly.com/uploads/1/3/4/6/134636283/9bedabe4100846.pdfIn PDF document text
    • https://wanesutilujat.weebly.com/uploads/1/3/4/8/134868149/tujiw-dumoxolavub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nomebazeregi.pbworks.com/w/file/fetch/144760593/68744557969.pdfIn PDF document text
    • http://betosaxugawi.pbworks.com/f/vasorupasox.pdfIn PDF document text
    • http://ruwezebom.pbworks.com/w/file/fetch/144600087/vugulojubuzofeliwoje.pdfIn PDF document text
    • http://ludagobef.pbworks.com/f/msci_acwi_ex_usa_index_chart.pdfIn PDF document text
    • http://joxupakager.pbworks.com/w/file/fetch/144488889/como_aprender_a_falar_em_publico.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/f/dr_mata_rcn_capitulos_completos.pdfIn PDF document text
    • http://biduzoku.pbworks.com/w/file/fetch/144480720/etapas_del_desarrollo_segun_jean_piaget.pdfIn PDF document text
    • http://varulemenel.pbworks.com/w/file/fetch/144648756/nys_dmv_odometer_disclosure_form.pdfIn PDF document text
    • http://sozakuvepar.pbworks.com/w/file/fetch/144583344/bliss_os_iso_size.pdfIn PDF document text
    • http://kukepofarit.pbworks.com/f/39825570215.pdfIn PDF document text
    • http://sofutikajen.pbworks.com/w/file/fetch/144627117/tcl_65_inch_tv_specs.pdfIn PDF document text
    • http://xuwajesorewo.pbworks.com/w/file/fetch/144655677/o_senhor_das_moscas_william_golding.pdfIn PDF document text
    • http://runaliguredu.pbworks.com/w/file/fetch/144442803/70831309499.pdfIn PDF document text
    • http://mitamugukojo.pbworks.com/w/file/fetch/145017684/navonegasidabuma.pdfIn PDF document text
    • http://pewudomame.pbworks.com/w/file/fetch/144615567/xonaforuwisos.pdfIn PDF document text
    • http://vonodatob.pbworks.com/w/file/fetch/144718986/1504227769.pdfIn PDF document text
    • http://panuduxeruv.pbworks.com/w/file/fetch/144739170/dekolesu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EA 5436 bytes
SHA-256: f9dcd065cad6bf5596a474d00bb5c719418861961b0504606a5ea706bed53142
font_01_sfnt_off00010865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10865 10636 bytes
SHA-256: c229148b64343e650cf2ed3a21fa9969a393a9f46a830638da5b05e496390560

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