Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c2013c76e4ccb0…

MALICIOUS

PDF

68.9 KB Created: 2021-02-08 01:23:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7b406548ab3820c28e0b9e38a1ce8cf7 SHA-1: 8558f0fa5757aef912fd85f13eb52c3846681ee8 SHA-256: a8c2013c76e4ccb0a6635c20c88502b5c02076eee161e806d3d3dc564bb5ca13
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with one specifically identified as a lure for a 'tech 9 guns training academy'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=tech+9+guns+training+academy PDF link annotation
    • https://cdn.sqhk.co/nosuterib/jiafkTZ/nomabazupikomanapenexuxe.pdfIn PDF document text
    • http://segway-wheelchair.ru/the_periodic_table_study_guide6se7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391954/normal_5ff638ebcb4be.pdfIn PDF document text
    • http://spiritstudio.ru/honeymoon_cystitis_adalahzj2p8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412165/normal_5ffdfc4cca71f.pdfIn PDF document text
    • http://marinarus.space/download_gods_of_egypt_movie_in_hind4oo99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384825/normal_60130c1fdf5f7.pdfIn PDF document text
    • https://cdn.sqhk.co/walumupo/VhfOv46/mukovuwetimefes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383800/normal_5ff75ea04cc7a.pdfIn PDF document text
    • https://bafipiwefewojex.weebly.com/uploads/1/3/4/5/134576197/sadivogipezo-dowisizaxezu.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/kewuxejikiwe/42074347278.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/windows_movie_maker_cnet.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/senor_wooly_adonde_vas_worksheet_answers.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_off0000cfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBD 5528 bytes
SHA-256: 8e064a854f88600d86839bf2d2c5e899f8cbd65c0166665adadf525e92689482
font_01_sfnt_off0000e265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE265 10748 bytes
SHA-256: 4626898c3c5a50d9d87eca0e7a9ff016776597089805d4880211f4d5affdde4b

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