Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c5f666a22f08280…

MALICIOUS

PDF

72.7 KB Created: 2021-03-22 21:05:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ff54ff2d51afcc274d54b0ced06b51e2 SHA-1: 900cf999a3eb7f5d2efa64c602dcc4cc8e439958 SHA-256: 2c5f666a22f08280865f70e4b32d87f9f5137190bea10d92634d5026c9605c89
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm pattern, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=optical+fiber+communication+notes+ppt PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369768/normal_5ff12f915a2f6.pdfIn PDF document text
    • http://pitushok.space/which_echo_device_is_best5aj30.pdfIn PDF document text
    • http://indital.fun/how_do_i_renew_my_ma_drivers_license_in_illinoisenn3z.pdfIn PDF document text
    • http://lifepax.iblogger.org/flatland_book.pdfIn PDF document text
    • http://latuha.com/berserk_2016_onlineyyrt4.pdfIn PDF document text
    • http://voztrans.ru/balveer_returns_hdtzu4i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406191/normal_6034506958a26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402722/normal_5fd795807cf77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465719/normal_5fccfda8b7ae5.pdfIn PDF document text
    • http://gravkamen.ru/71182996325saotp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443598/normal_6036d40a1fe55.pdfIn PDF document text
    • http://leree6.club/81456477801afw2i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bujuxun.rf.gd/94578836372.pdfIn PDF document text
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_a9728d0fde1e4527a733571752a92b0c.pdf?index=trueIn PDF document text
    • http://roxeruteruda.epizy.com/80987503659.pdfIn PDF document text
    • http://zukuvib.rf.gd/punjabi_bhangra_song_dj.pdfIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_a14b6c9e24b745958c566cab82bbd08a.pdf?index=trueIn PDF document text
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_3dde658e45b444ed875f094bab21aa8b.pdf?index=trueIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_96ffe3e952b244709f75b85782934cdd.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C3 5328 bytes
SHA-256: 33b3b1e61e9960701a3a16e159ccfe98990ecd81f5d741f374f797fd35500b4d
font_01_sfnt_off0000e8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BD 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 10588 bytes
SHA-256: fd53d1e9affd8cc1efd610b7e3bba046250444b0bf670eb1e7c3808854d35b55

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