Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da926e526b0022d…

MALICIOUS

PDF

80.6 KB Created: 2021-03-29 00:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 522f5d5069fdc6f0221bbff62907c15a SHA-1: 9d2290c5db65e347700ef82db31c350265883b93 SHA-256: 4da926e526b0022d47ce27e02acebddd303e98b5fe59d702de750c6e33f72383
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/wix?keyword=tongariro+national+park+accommodation
    • https://cdn.sqhk.co/jadojibam/CXjjhfZ/rankle_definition_dictionary.pdf
    • https://cdn.sqhk.co/vivutazawi/4Pgdxhc/acute_bronchitis_guidelines.pdf
    • https://cdn.sqhk.co/xufatirumina/jeBhfzg/summer_camp_staff_training_powerpoint.pdf
    • https://cdn.sqhk.co/marixefe/dhiiiji/ivanka_trump_children_s_names.pdf
    • https://cdn.sqhk.co/walumupo/WrBKohb/3084872886.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/16edc7b4-aa4b-42f0-918c-e8767557db99/17349077778.pdf
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_e137bc73b7c54c97a63a0a7bf8985640.pdf?index=true
    • https://s3.amazonaws.com/kudowo/simulacra_jean_baudrillard_summary.pdf
    • https://s3.amazonaws.com/suxugipipolazog/campaigner_premium_profile.pdf
    • https://uploads.strikinglycdn.com/files/c729d8a7-b01e-4f2e-9c44-d4679ad49971/casio_pathfinder_watches_for_sale.pdf
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_b203847e1b8a4fd7bd4f2fbfbefdcc8b.pdf?index=true
    • https://s3.amazonaws.com/tirimofufemukat/4168122791.pdf
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_f5c8aa986d6b4146945bc3173f633931.pdf?index=true
    • https://6b9ff03a-ef48-417a-a14c-919df0f903d0.filesusr.com/ugd/f459ea_91fc6aae3cf64e1c9ef572ca54e1c144.pdf?index=true
    • https://s3.amazonaws.com/tozaduliwubega/scbs_annual_report.pdf
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_5c7614b302184c3492b1197ec93dd130.pdf?index=true
    • https://s3.amazonaws.com/tobovunoberiki/katetazetijubos.pdf
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_91d1b1f618ea4d02be6902439b48b4d2.pdf?index=true
    • https://f0ddeb88-3549-4a27-8821-6e3dd713f165.filesusr.com/ugd/2b74da_d803b133c5694f2cb533d246e7502438.pdf?index=true
    • https://441dbedc-201a-49d7-bb2a-292980023e2b.filesusr.com/ugd/473728_28f90b83e314444289d6d3fc875b91a0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/54df0183-d350-4cf5-b6cd-370f52dec1fd/how_do_i_get_a_certificate_of_divorce_in_ontario.pdf
    • https://uploads.strikinglycdn.com/files/8c38dae5-55c8-415e-a207-5a1034465c58/how_to_know_if_transmission_fluid_is_leaking.pdf
    • https://uploads.strikinglycdn.com/files/572e2571-341f-4bf2-a86c-9bfcb303a2ae/obd2_cant_connect_to_ecu.pdf
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_714b7a5ad3094dbb83e80727030f2475.pdf?index=true
    • 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_off0000fce3.bin
cc6e11e3d2b95d0368f17b2536a7a1abe94860ed8c0e9ebfb2ea000e10f3fc9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE3 5228 bytes
font_01_sfnt_off00010e9c.bin
deea7a96017313ce27909e1c2e82bdeb4d697ce5b085fd6c923ac63a155f787a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9C 10988 bytes

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