Malicious PDF — malware analysis report

Static analysis result for SHA-256 090e8a0ca54e5e22…

MALICIOUS

PDF

75.2 KB Created: 2021-03-20 07:10:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ef2e44f612121185cbb145397b77c8de SHA-1: a32d41c3fc2f2cc357670383a68b9bdb4211ac90 SHA-256: 090e8a0ca54e5e22e526de67a748c0517ea6935486856f035c8e6f3678a09896
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The primary lure appears to be a search result for a technical query, likely to trick users into clicking the malicious links.

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://lozipotod.ru/award?keyword=convert+base64+to+pdf+java+example PDF link annotation
    • http://hargotel.xyz/fiddler_on_the_roof_movie_plot_summaryhhxon.pdfIn PDF document text
    • http://jujovobima.getenjoyment.net/xotefimujodugidupabo.pdfIn PDF document text
    • http://krepezh.guru/81083362623urrb9.pdfIn PDF document text
    • https://nusutaligufobam.weebly.com/uploads/1/3/5/3/135393176/galafenakipulizo.pdfIn PDF document text
    • http://sejerodetupumil.medianewsonline.com/jitofekalalatuse.pdfIn PDF document text
    • http://priz24.site/20771029084trx7.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/nidapujekivuk.pdfIn PDF document text
    • http://mumijivamivaxij.medianewsonline.com/40822984149.pdfIn PDF document text
    • https://nivujetomut.weebly.com/uploads/1/3/4/7/134753784/4980302.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xowilewegiwo.myartsonline.com/ielts_listening_recent_actual_test_volume_1_audio.pdfIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_ba618682fc454679b0888bb54fdd5392.pdf?index=trueIn PDF document text
    • http://zopibekaboxopa.epizy.com/how_do_i_apply_at_zaxbys.pdfIn PDF document text
    • http://zidarebuna.epizy.com/how_to_write_essays_for_college_scholarships.pdfIn PDF document text
    • https://d920bd67-dfaf-4c99-85b0-fcb8118dfb91.filesusr.com/ugd/383849_0199a17cf99e424fa0b0a8e24d8d0335.pdf?index=trueIn PDF document text
    • http://livirava.atwebpages.com/70805879995.pdfIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_36b4ecd500384311b12ec7d89e1c2258.pdf?index=trueIn PDF document text
    • http://wazeniwemir.onlinewebshop.net/569582026.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_off0000e4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B8 5676 bytes
SHA-256: 94a6cf9209d2834d90bd5b4e5a7ed724919d9f6b3fc4462668af407c4efbb0d0
font_01_sfnt_off0000f7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FD 11700 bytes
SHA-256: 3fe0c1c93c22061a3d0548b6872be42ecbe77d2eef55b1bbef83ac8357b596b9

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