Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbfbf4d6250834f…

MALICIOUS

PDF

79.7 KB Created: 2021-02-12 16:40:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6bccca204ffd388634daf3634475ab9d SHA-1: 7682c22c80b27fa29025a7472fd330ec9318fee4 SHA-256: 8fbfbf4d6250834f703c3b65545e50421dba5b9d59a3003fe06839d75acfd1b8
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of these links, https://druttle.ru/123?utm_term=world+history+chapter+12+section+4+note+taking+study+guide, is embedded within the document's structure. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to manipulate search engine results or distribute malicious content via linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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://druttle.ru/123?utm_term=world+history+chapter+12+section+4+note+taking+study+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449599/normal_60195288d659e.pdfIn PDF document text
    • https://piteselijofer.weebly.com/uploads/1/3/4/6/134608400/tized.pdfIn PDF document text
    • https://zanirifut.weebly.com/uploads/1/3/1/4/131407922/3185742.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451025/normal_5ff1fa6ef0457.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485457/normal_5ff4ddb2a6a88.pdfIn PDF document text
    • https://bunosepe.weebly.com/uploads/1/3/1/3/131379858/99b6ccf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461766/normal_5fc9d83265e6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475737/normal_5ff80e3391c6f.pdfIn PDF document text
    • https://womomoko.weebly.com/uploads/1/3/4/8/134848640/dijope_sosekos_serosaxanujefut_gexos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421466/normal_5fc886d8a03aa.pdfIn PDF document text
    • https://guzajemifuraruv.weebly.com/uploads/1/3/0/8/130874286/7f0d684.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416675/normal_5ffd62b5defca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481275/normal_5ff2ba8bd8947.pdfIn PDF document text
    • https://pipenibeteza.weebly.com/uploads/1/3/4/5/134508730/voxederodalelajeketa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457838/normal_5ffe2b322a761.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501193/normal_5ff0b6ac18694.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/rizivitop.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/aging_report_in_sap_customer.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/13857318955.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/8_parts_of_speech_worksheet_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/wofivojeliturarewotip.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/animal_farm_summary_all_chapters.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_off0000f5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F8 5788 bytes
SHA-256: e0e2923d92db263cf01c8072370052fbee00c24c1c3f63ed2e6da30fffd7de18
font_01_sfnt_off000109ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CA 10848 bytes
SHA-256: cd71b1f4773d37ed7f47536e007a2f3e157dffdd77b0c72cd67f028c24e60297

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