Malicious PDF — malware analysis report

Static analysis result for SHA-256 443a29bf073c4582…

MALICIOUS

PDF

78.4 KB Created: 2021-04-08 18:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1d842104ac1e58d6ba4c2a1a9758ae7 SHA-1: ad1279e0608bf324a47e968e29e718d28cb6e82b SHA-256: 443a29bf073c45825c511dc63cd832023b6374555bcc042d0645de6c799df9d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary goal appears to be phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=serato+dj+software+compatibility
    • http://robinmani.site/zutojvlnz5.pdf
    • http://dorulezebum.sportsontheweb.net/71582607502.pdf
    • http://raisinshub.club/bivufelufogunirezomos8r6do.pdf
    • http://alphabitx.com/932259812944j1i4.pdf
    • http://tanijijud.sportsontheweb.net/formal_email_writing_exercises.pdf
    • http://hookup755.fun/public_speaking_anxiety_articleswmoec.pdf
    • http://texoraw.sportsontheweb.net/38694639909.pdf
    • http://plusstore.pro/application_letter_format_for_leave_in_collegeplzho.pdf
    • http://nokasosozigof.mypressonline.com/tivo_series_3_stuck_on_powering_up.pdf
    • http://lorozetuwivu.medianewsonline.com/ssc_nic_in_mts_result_2020_download.pdf
    • http://momexatajuma.22web.org/celeration_chart.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_1936833632dd482c8d6d92104faa7a20.pdf?index=true
    • http://dokaxemimagi.epizy.com/mewalafonelujax.pdf
    • http://paruwegugu.rf.gd/36360077636.pdf
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_6ffc8b4219c548bf95aba59af0cede84.pdf?index=true
    • https://s3.amazonaws.com/guwutivupudutu/will_the_2021_ford_edge_be_redesigned.pdf
    • http://xabogubumux.rf.gd/dixodibewolawepapoketolur.pdf
    • http://xipanizi.myartsonline.com/what_is_seth_gold_worth.pdf
    • https://s3.amazonaws.com/jalasilunaz/angular_template_variable_dynamic_name.pdf
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_f6620d12ab144758b078e541c5854840.pdf?index=true
    • http://kevawiposiwa.rf.gd/98039277683.pdf
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_b5fe5481e66f4b07a7a10c14bb307b78.pdf?index=true
    • 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_off0000f0b4.bin
77668fe9c95a3cd3a9922e919f2b2f5f1f073b9de8142ea4ddcd3354a30f61be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B4 5812 bytes
font_01_sfnt_off0001047a.bin
c572750cba199ed945d111c9a27ba53bc1ccd9ef101cc197725b052c14048ba5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1047A 11096 bytes

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