Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bec8597ef2013f8…

MALICIOUS

PDF

79.2 KB Created: 2021-03-02 10:51:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e50158a6ff7a12c7928d57e03cceab67 SHA-1: 79efd5af24d47fb76305f812899b0ec165270360 SHA-256: 9bec8597ef2013f8f5bcf3aa2bfb9c869d710eee33ec15704e722b0edf606e3e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://kuzutuzo.ru/wix?keyword=las+tic+en+el+ambito+laboral+unam PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4386330/normal_5ffa22c359745.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367941/normal_5fcdc20474601.pdfIn PDF document text
    • http://xurijozidarov.22web.org/mother_s_day_worksheets_for_third_grade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388608/normal_603bdfba6cb22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460708/normal_60375392b5916.pdfIn PDF document text
    • http://secret-empire.ru/rexedujikodakonevitowobat6n1da.pdfIn PDF document text
    • http://all-host.site/84935118794fnjk5.pdfIn PDF document text
    • http://macsk.space/detoxixogaslf3bp.pdfIn PDF document text
    • http://italiahot.space/musical_surroundings_phonomena_ii_manualxapbv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454422/normal_603853c206bee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450356/normal_5fcd603da8115.pdfIn PDF document text
    • http://ozalupa.space/tamilrockers_tamil_movies_2017_hdqea0e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rexawisoza.epizy.com/auxilio_judicial_temario_gratis.pdfIn PDF document text
    • http://wulakutagugizi.rf.gd/hoover_dual_power_max_pet_manual.pdfIn PDF document text
    • http://wazewatiduxuz.epizy.com/vamimowedopigutewifufaf.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF695 5024 bytes
SHA-256: 53c8d58f3043b1b1fcb038ec5b1644c2e1a1b23532a27fa0358822b84f7d673d
font_01_sfnt_off00010794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10794 11888 bytes
SHA-256: 0c186f41074e0bac5c3581f0659ec0c908c92872a5d8e2c3a680f1a5a4e8c97b

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