Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84e7bce03b7abd3…

MALICIOUS

PDF

77.7 KB Created: 2021-04-25 08:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3a9bdd7430f206605cd149063862dec SHA-1: 9b0351ec01bfc7105806c9d9ac31893b7c00b018 SHA-256: f84e7bce03b7abd3051a41a3b99768e7915b538f8d04ef9b0d1ccedc635f6dc9
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with at least one pointing to a suspicious domain ('soxebez.ru') that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links on disposable domains, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://soxebez.ru/strik?utm_term=naz%25C4%25B1m+hikmetin+%25C5%259Fiirler+yazd%25C4%25B1%25C4%259F%25C4%25B1+kad%25C4%25B1n
    • https://cdn-cms.f-static.net/uploads/4450347/normal_60251f51233ec.pdf
    • https://vimavopama.weebly.com/uploads/1/3/4/7/134769365/monozududikodido.pdf
    • http://polnews.xyz/dogfight_the_musical_cast_sizer4sp5.pdf
    • http://topsol.xyz/how_to_force_tivo_software_updatek6hj6.pdf
    • http://bibivire.mygamesonline.org/60124506593.pdf
    • https://static.s123-cdn-static.com/uploads/4405650/normal_5ffc2bcdcd8fc.pdf
    • http://trokot-newshop.online/34723308435hd0xs.pdf
    • https://radebijudowax.weebly.com/uploads/1/3/1/6/131607027/69a59b0b.pdf
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/mubofig.pdf
    • https://cdn-cms.f-static.net/uploads/4454300/normal_604ecee599713.pdf
    • https://static.s123-cdn-static.com/uploads/4413017/normal_6007e1a8837ef.pdf
    • https://cdn-cms.f-static.net/uploads/4450240/normal_6010f6f7afbc0.pdf
    • http://daravto18.ru/audit_report_of_tata_motorscc0ns.pdf
    • https://cdn-cms.f-static.net/uploads/4393345/normal_6029ac0a3681b.pdf
    • http://help-copyrightviolationhelpcenter.com/78674944326kiwqz.pdf
    • http://ramidavukul.medianewsonline.com/free_download_to_excel_converter_software_with_crack.pdf
    • http://xitimudajejo.mywebcommunity.org/longman_academic_writing_series_3_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wemaxoseni.myartsonline.com/mathematical_analysis_by_malik_and_arora_free_download.pdf
    • http://tikomiwewo.atwebpages.com/what_are_the_principles_of_law_of_contract.pdf
    • http://zibelasavu.atwebpages.com/xuwazogaruzelufaritaxeke.pdf
    • http://xutenujute.myartsonline.com/microbiologia_clinica.pdf
    • http://vexabimumemig.atwebpages.com/jufitodonufexufa.pdf
    • 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_off0000ed8a.bin
9643411762b2913405b3bc253b6d1271dc39f28452dd2df7c0ab24aa3f494e8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 5584 bytes
font_01_sfnt_off0001007c.bin
4ca906248183dc9b2281d1d42fb2f76cb8f248cc93f887a2614d6a82bd8775e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1007C 12128 bytes

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