Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40b0970a6f33e4f…

MALICIOUS

PDF

70.0 KB Created: 2021-03-19 09:08:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ed90162af3ba6a3f6538dfd0cdf6088 SHA-1: fb5ab4bf55da39c2d29115b88865d3168e1f4fe1 SHA-256: e40b0970a6f33e4fb59f50374c8cb0e0cdd95a3acc13e712211df728330e243d
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to educational materials, likely designed to trick users into visiting malicious sites.

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://jottigo.ru/wix?keyword=grade+4+module+7+answer+key+homework
    • http://zugasanuko.getenjoyment.net/bilomobakolepadokegazenaw.pdf
    • http://wejowadizabudex.mypressonline.com/xadememadujowipubaku.pdf
    • http://jebonefawudo.sportsontheweb.net/64471975083.pdf
    • http://xawamiwupajev.mygamesonline.org/montage_amplificateur_audio.pdf
    • https://cdn.sqhk.co/lisakopew/VaXdPje/17092683347.pdf
    • https://cdn.sqhk.co/kixikeli/gdxoGhj/zukogekaginuxegefunefubup.pdf
    • http://kawasus.scienceontheweb.net/35485505056.pdf
    • http://mizafaroremida.getenjoyment.net/soruzirowunepozalemitevis.pdf
    • http://zofugef.mypressonline.com/knights_of_columbus_4th_degree_regalia_change.pdf
    • http://borejukeluteva.mygamesonline.org/esl_comparative_adjectives_worksheet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mubodadekutaxim.atwebpages.com/deputy_executive_director_unicef.pdf
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_f23e7c9bb77841988742ba22df62a392.pdf?index=true
    • http://xejobutek.onlinewebshop.net/feviwilomadutebadi.pdf
    • https://s3.amazonaws.com/wopari/ponniyin_selvan_tamil_movie_budget.pdf
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_58513433f5a84407ad9d0b8c9a5974bd.pdf?index=true
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_521fd4a28de84c2dab786e5247aa5a27.pdf?index=true
    • https://s3.amazonaws.com/muvazi/grammarly_for_mac_free.pdf
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_f2b2bd7435e542ce89cfa137089e798b.pdf?index=true
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_c516bbe5361b4328af9d430efa7cb2cd.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_off0000d3da.bin
83c8432fecfc109fc702b5c4eef13fda72f6337019f41d85e35881f26fabf149		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DA 5524 bytes
font_01_sfnt_off0000e69d.bin
58bb3c6e48f1f96c6a435680f7002113b02ecf0ed71782ed846bf5dfbfc54b7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE69D 10564 bytes

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