Malicious PDF — malware analysis report

Static analysis result for SHA-256 b872893204c4b204…

MALICIOUS

PDF

67.7 KB Created: 2021-03-30 01:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 280673626bad545822943c2286648681 SHA-1: 301083107b3010dcdfcd2649a1d30aa55d20fe9a SHA-256: b872893204c4b2045335699d4c70b66e7ffb6db59f7e26efcf9839adf06a502d
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is part of a link farm and hosts external URIs, specifically a URL designed to mimic a search result for a PDF download. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/wix?keyword=paul+johnson+intellectuals+pdf+download
    • https://cdn.sqhk.co/wadupaxi/idVhaDy/fuburibudosenoruton.pdf
    • https://cdn.sqhk.co/juxerawabuf/jdViiaC/conspiracy_theory_mel_gibson_trailer.pdf
    • https://cdn-cms.f-static.net/uploads/4479715/normal_601d93b36f158.pdf
    • https://cdn-cms.f-static.net/uploads/4368741/normal_605c3f573ae92.pdf
    • https://static.s123-cdn-static.com/uploads/4404964/normal_5fe342a952619.pdf
    • http://ruvogodozipabiv.scienceontheweb.net/dewel.pdf
    • https://cdn.sqhk.co/juvanejejuwo/jxS4iek/best_mudding_tires_2019.pdf
    • https://cdn.sqhk.co/dibirolinu/jexgjcc/76653001081.pdf
    • https://cdn.sqhk.co/peferitukofa/OX4lifa/bride_and_prejudice_movie_filmywap.pdf
    • https://cdn-cms.f-static.net/uploads/4403938/normal_60624ea16365b.pdf
    • http://zifufarox.getenjoyment.net/10827359939.pdf
    • https://cdn.sqhk.co/gepeduvo/8jadjj3/airport_flight_status_delhi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_faecd159977347559977705662a09cfd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9d34daeb-d243-4e1c-a6dd-41852051f820/9.9_scatter_plot_worksheets_with_answers.pdf
    • http://vejegaba.atwebpages.com/how_to_reset_corsair_k95_keyboard.pdf
    • https://uploads.strikinglycdn.com/files/5b580e0a-308c-4e59-8bee-7075bce5624e/washington_state_lottery_scratch_ticket_winners_left.pdf
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_5f6790c68bb44e76ad9a7a982390d0cc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5d910100-d976-4245-b160-fc94097d5f40/what_size_tires_does_a_2013_ford_focus_have.pdf
    • http://mukanebesiva.atwebpages.com/32285773826.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_off0000caf8.bin
92ba02f9e5c3a4ab0ba81822441a5086d057b0c9f30e874aa62b03427e622ff2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF8 5316 bytes
font_01_sfnt_off0000dd27.bin
1972edbe127ca693c23a59cadfcc09898e4d54f8a81c9ea7fda400214c7e8299		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD27 10732 bytes

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