Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde33d4250d439c0…

MALICIOUS

PDF

75.9 KB Created: 2021-03-22 02:40:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b26bedc56238bd9a249952ac7afbf2bc SHA-1: 256f94491d7ab1a07d2bdb7b49a94494a5477780 SHA-256: cde33d4250d439c0dac66d0efff1d6f3062e622063b24879a3c2ad5b5ffdf95e
134 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 host further PDF files, suggesting a multi-stage download or redirection scheme. The presence of a 'download button' heuristic further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/123?utm_term=business+functional+requirements+document+template PDF link annotation
    • http://f13x.xyz/rujizamudovirerodokujibapvx1z2.pdfIn PDF document text
    • http://medway24.com/pojibutigolakajejqty8x.pdfIn PDF document text
    • https://cdn.sqhk.co/wirumedaba/caGeYia/nokuzapuvuse.pdfIn PDF document text
    • https://cdn.sqhk.co/rigepasemapa/ajhNjeo/world_war_2_offline_strategy_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/wanevakaxuma/gcjdqhe/558238256.pdfIn PDF document text
    • https://cdn.sqhk.co/leruwexikud/bgfjafs/ryoma_rebirth_movie_the_prince_of_tennis_trailer.pdfIn PDF document text
    • http://normab-id.com/maytag_centennial_washer_parts_near_meb0zuz.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/pijomikewanu.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovipawe/igigcie/us_park_police_pay_scale_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/pagozixupezi/fygcpI7/47354222451.pdfIn PDF document text
    • http://milano-moda.space/90500824537hi0i.pdfIn PDF document text
    • https://cdn.sqhk.co/kuburarimoku/dhiIidA/deutsche_post_ag_annual_report_2017.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jorasixu.myartsonline.com/54890353728.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/a_raisin_in_the_sun_quotes_walter.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/67802722902.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/best_online_converter_to_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/staph_bacteremia_idsa_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/facebook_messenger_without_app_store.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEB 5356 bytes
SHA-256: fa8f55d5fa329bc5b2231081b4bcb30bc715ec8e915eaea757ce4184103c2ab1
font_01_sfnt_off0000f0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FB 10136 bytes
SHA-256: 88b91a58eedb9f4b7188a6abcb92475fe34d327aa18ce23b37e179df15a6d047
font_02_sfnt_off000113a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A6 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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