Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66c47cf82541f88…

MALICIOUS

PDF

98.9 KB Created: 2021-03-12 14:59:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0555a7a309c0426a121965b9f48dffce SHA-1: 16208a329e407ccaba6307267f5cacfe888d4ade SHA-256: b66c47cf82541f88b0c58eb0fd8a1f33d4403e769b462a7be9d085d80deec5e8
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://ponafet.ru/strik?utm_term=learn+hindi+to+english+pdf PDF link annotation
    • http://vizemezezu.sportsontheweb.net/world_history_book_for_upsc.pdfIn PDF document text
    • http://xilexevu.scienceontheweb.net/93828671816.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tafiwepamubov.atwebpages.com/6423696285.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/el_coronel_no_tiene_quien_le_escriba_pelicula_descargar.pdfIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_f95d69e8590445fa82d6447556916900.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/how_to_reset_adt_alarm_without_code.pdfIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_69cb60d790e24d1992ca0f1c5ad879cf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/58518300905.pdfIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_74624010605d4c678f767eb56a8c552f.pdf?index=trueIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_c4ace3f645ae46ec93cf9856bbed1627.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/list_of_south_african_apartheid_laws.pdfIn PDF document text
    • https://0d801636-e20c-47cf-9654-f2c4f0d28fb9.filesusr.com/ugd/2e7c9c_48192bb48ecf488484002472f55ca058.pdf?index=trueIn PDF document text
    • http://namakanexir.atwebpages.com/how_to_determine_energy_efficiency.pdfIn PDF document text
    • https://8772a198-af03-49ef-8724-5feb7546cb8a.filesusr.com/ugd/436f04_31db0191cbac4b31ab425e3eb63375a6.pdf?index=trueIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_aad206c00dcf442e94f9d49e8ca3a592.pdf?index=trueIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_f36712c71c5c4e4f819867152ff6d3e8.pdf?index=trueIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_1b2614ca3fb8459e984177bdbd35ae4d.pdf?index=trueIn PDF document text
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_9242f48d8fcc45a0ae890cfebcacd2a8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/bejiveronuxen.pdfIn PDF document text
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_51c0a694876a40d8be98a8fa9deb380f.pdf?index=trueIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_cc9201ea94a74bf3b82d857f455087b5.pdf?index=trueIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_12eed001f9b54cdba9523dd8939cee8b.pdf?index=trueIn 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_off000145cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145CF 5244 bytes
SHA-256: fa9c40b99621b79576a9580f8e06f7d62037728dd897101c821c50694743f45e
font_01_sfnt_off000157a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157A8 11376 bytes
SHA-256: c9b441ad58558269404f05aa805e39251ad560533ce844da5a6ab6f2365d9452

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