Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a54414f7afd2618…

MALICIOUS

PDF

77.6 KB Created: 2021-06-01 17:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7bf248907b59d3b7d5e904520fd5d123 SHA-1: 4345284a28d4b2c667dbdcea4058785e34330929 SHA-256: 6a54414f7afd26182b973db6e859dbef6c2eb12d715978e2ee4df3377e2b88fd
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://chcial.ru/pbw?utm_term=plantas+c3+c4+y+cam+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4499972/normal_60095e2a005a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370317/normal_5fcfeccab1142.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419410/normal_6034483b095d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413113/normal_60645175404dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443594/normal_606a1ee2b9b53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419235/normal_60011d683e68b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419437/normal_5ffa07c058d31.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://naxoxututal.pbworks.com/f/pobunelaluma.pdfIn PDF document text
    • http://muxopal.pbworks.com/w/file/fetch/144440442/seven_deadly_sins_prisoners_of_the_sky_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c582578-1342-471a-a97c-b780430f8fa0/narrative_of_the_life_of_frederick_douglass_sparknotes_chapter_11.pdfIn PDF document text
    • http://midevodimu.pbworks.com/w/file/fetch/144435495/pokemon_diamond_and_pearl_download_gba_rom_hack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc45a605-c60f-4b57-b4de-b47c58ecd20d/mopexelejobawotiselig.pdfIn PDF document text
    • http://tagexoba.pbworks.com/f/how_long_should_a_dyson_v10_battery_last.pdfIn PDF document text
    • http://zepadatoju.pbworks.com/f/how_to_get_rid_of_a_cystic_pimple_on_face.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0479423f-9521-495b-9814-937e120a569d/zunotebuxumabolo.pdfIn PDF document text
    • http://zegugas.pbworks.com/w/file/fetch/144411456/10109408561.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5438668-1470-48ab-bf13-c652ee9152a1/zagasibonizasijizafef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16f57c32-cac9-45af-ace0-8f80a7b09f6a/disney_park_pals_collectables.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_off0000ebed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBED 5560 bytes
SHA-256: c5d2997eac1295e04033023fb729696ac1dc5aa1a4e2061e0ca6fcc43f4ce8a1
font_01_sfnt_off0000fede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDE 12844 bytes
SHA-256: 0806dabe5d658fe0334cd645943a8a0de9508e121e47cb0d05aa9643609b7012

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