Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67b4948bf9befdb…

MALICIOUS

PDF

74.9 KB Created: 2021-03-24 06:39:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 65bf3a790e9a7cbe663e242303c6f319 SHA-1: c9e5e5fefc8b4f90bfbebb3124670d3a705e2f0c SHA-256: b67b4948bf9befdb5e471937d9cc3a81b1eb93ead6af225fbdd509b9f915634c
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or credential harvesting campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to redirect users to potentially harmful sites.

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://druttle.ru/wix?keyword=haier+cprb08xcj+portable+air+conditioner+8000+btu+manual PDF link annotation
    • http://rejuxipo.iblogger.org/korid.pdfIn PDF document text
    • https://cdn.sqhk.co/temejikowewa/0Bginhi/52833082735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419424/normal_6030d9ef8b150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466666/normal_60295c3e1a632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403820/normal_602261b8940c5.pdfIn PDF document text
    • http://crystal-light33.ru/letter_from_a_birmingham_jail_summaryeqyog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381297/normal_6013335e7c5d3.pdfIn PDF document text
    • https://cdn.sqhk.co/tofatuxurejo/djy6Zek/star_chores_family_task_manager_app.pdfIn PDF document text
    • http://rivalo130.com/how_to_write_personal_statement_for_college_admissionm9ykr.pdfIn PDF document text
    • http://gnoogle.site/ejercicios_resueltos_de_estatica_priaw3y4.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/j1gejiB/tepigodusuperima.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/eCjgjiv/dovame.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369936/normal_601ca67f6c9d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/infrastructure_engineering_and_management_book.pdfIn PDF document text
    • http://rowomasogig.epizy.com/fortnite_insider_cheat_sheet_week_3.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/31188012782.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/sireleposekuxedewanu.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_off0000e5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F2 5624 bytes
SHA-256: 7809acdf898a00dfeb1f740ac429d370b4d129ae4cae0d1379fd2a681669d96d
font_01_sfnt_off0000f8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F5 10904 bytes
SHA-256: 9de264dc2938c5bf0c3a7942558ee787dbf257e5fdf7ec010b36cfbcb270dc4d

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