Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9a4e5e2e29ab00…

MALICIOUS

PDF

78.0 KB Created: 2021-03-09 11:42:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f43ad687b7f61a6929af834e2a05e0ab SHA-1: 4e8fcbc2f9fd0caba73ee44dc4db98bdd00a8ae8 SHA-256: cb9a4e5e2e29ab00b98d34584b29a6c946c41a8e08840149b2847fa987c04514
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are associated with SEO link farms, suggesting a malicious intent to manipulate search results or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

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://pelibifir.ru/award?keyword=periodic+table+labeled+pdf
    • https://cdn.sqhk.co/bapuwanuvadi/ib96iey/wusedovu.pdf
    • https://lowobuganigazo.weebly.com/uploads/1/3/1/1/131163610/wediladoz.pdf
    • https://cdn.sqhk.co/nupumusu/ahggigg/43455271172.pdf
    • http://dixojele.22web.org/74971458234.pdf
    • https://cdn.sqhk.co/movumatoz/idicLij/40141379659.pdf
    • https://fudixiboronis.weebly.com/uploads/1/3/4/3/134322082/bizarimojetilapu.pdf
    • https://cdn.sqhk.co/mosepoxik/aijjjXt/chemistry_gas_properties_simulation_worksheet_answers.pdf
    • http://fovoxarofej.getenjoyment.net/is_tracfone_out_of_business.pdf
    • https://cdn.sqhk.co/fedijadika/Qhbejic/jofukavajajezu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://kemuvatixas.epizy.com/how_to_remove_gridlines_in_excel_spreadsheet.pdf
    • http://nifubaj.rf.gd/26324061890.pdf
    • http://benamow.myartsonline.com/how_to_become_a_functional_fitness_trainer.pdf
    • https://0b7b936c-93ac-4a60-9644-6ba220b934cc.filesusr.com/ugd/b4bf80_6cec5d1c00f24c45927ddba24c17442d.pdf?index=true
    • https://f7690f66-1871-4559-97e0-239dee5b15da.filesusr.com/ugd/d2cc1f_a05342f5417c4209b69563854b97c69a.pdf?index=true
    • http://sabixukavizom.myartsonline.com/fekokifanimabixus.pdf
    • http://vaveboxalubani.rf.gd/wudijilutizaz.pdf
    • http://tuzotulerijenej.rf.gd/iso_9001_standard_operating_procedure_template.pdf
    • http://dotalikajulu.rf.gd/familia_bixaceae.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e975.bin
5fd0d0ac86270a2d45abcd10d1860f5d19dc94f76b81524d2a7e619f5fc73d1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE975 4792 bytes
font_01_sfnt_off0000f9c5.bin
5d672ef601f68b22947ee19d21623a9ce1e1b4bb15529db9a2ebe89905724fe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C5 10316 bytes
font_02_sfnt_off00011d06.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D06 4324 bytes

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