Malicious PDF — malware analysis report

Static analysis result for SHA-256 475be273461afa1b…

MALICIOUS

PDF

77.0 KB Created: 2021-04-03 20:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bb6fefc2e08b51afc231d286755a362 SHA-1: dc71638de6ea8f1715e09b87380518b275ef2242 SHA-256: 475be273461afa1b0611e0ffe9aee8150c03e367da606b2792c895665633600d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links within a large number of seemingly legitimate ones. The presence of external URIs suggests an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/strik?utm_term=how+to+clean+filter+on+eureka+vacuum
    • http://riwaxutitono.iblogger.org/barron_s_sat_subject_test_math_level_1.pdf
    • http://taher-tcac.com/is_ihop_safe_for_peanut_allergy60uan.pdf
    • http://mamefumiwuto.mywebcommunity.org/seramonizufisaxikim.pdf
    • http://wojesukuzak.mygamesonline.org/toeic_vocabulary_test.pdf
    • https://cdn-cms.f-static.net/uploads/4494146/normal_604799a2b923a.pdf
    • http://koteyarn.moscow/aa_battery_energizer_datasheetbi3v2.pdf
    • http://arthromedshop.xyz/207842210484qi11.pdf
    • https://ruzuwigowan.weebly.com/uploads/1/3/1/4/131453288/9882925.pdf
    • https://cdn-cms.f-static.net/uploads/4452161/normal_602c858363a74.pdf
    • https://vufemare.weebly.com/uploads/1/3/4/8/134855896/7773563.pdf
    • https://movuvoxuwonorad.weebly.com/uploads/1/3/4/6/134667433/9a0270b.pdf
    • http://eglo.club/wulopipokd50xx.pdf
    • https://cdn-cms.f-static.net/uploads/4480889/normal_602e05bebfd8d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://satogitexuvo.myartsonline.com/18004377046.pdf
    • https://s3.amazonaws.com/mejados/saxon_math_course_3_written_practice_workbook.pdf
    • https://s3.amazonaws.com/setigafat/sijofozuzijojukisigisem.pdf
    • http://jofijegisa.atwebpages.com/proyecto_de_bioplastico.pdf
    • http://zanoxekuniz.epizy.com/kofofef.pdf
    • http://birukuf.onlinewebshop.net/ruvukikilegotinerun.pdf
    • http://xedonufil.rf.gd/migofazasakekinara.pdf
    • https://s3.amazonaws.com/suxuzubojut/30451338988.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_off0000f079.bin
b713014590b2b79b151c49a2b677086ffceac2a181d9079cdea3fb7a207ad9cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF079 5024 bytes
font_01_sfnt_off00010198.bin
4425f45e9a20a9c9da2e922244f9b42dc058a0f32458a577b8d32cd4bce619ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10198 10748 bytes

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