Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b609bfdb0f9236e…

MALICIOUS

PDF

61.7 KB Created: 2020-11-05 16:08:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: dff9c54170eae5057b4ad0ac181661c2 SHA-1: 23b10099affd20ebd3da10b163b0482fbf864dda SHA-256: 6b609bfdb0f9236eddd8a6c8f7e17789dff207ab0b8d15347edf763df6d4b48e
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by 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 1.0000

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://trafffi.ru/123?keyword=animal+cell+labeled+cilia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379718/normal_5f9a5997b3958.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5f873d805b123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405638/normal_5f9840b2633ce.pdfIn PDF document text
    • https://lowizozexide.weebly.com/uploads/1/3/0/7/130776176/9441920.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388827/normal_5f9e204f1cc82.pdfIn PDF document text
    • https://titawijuneve.weebly.com/uploads/1/3/4/0/134012454/a83bc042cc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379362/normal_5fa3894107c8f.pdfIn PDF document text
    • https://xomevore.weebly.com/uploads/1/3/4/3/134346529/dasolivumodebi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/65a4116b-ad76-46ed-a7a5-2dfb5efe6391/31700281705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf6e7c06-1061-4556-8301-edf83c864ce6/58521989498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc00f4f9-1e68-43cf-a0f2-93a46e8518c2/que_son_los_nexos_coordinantes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/578716a6-19fe-4c3a-849b-4136082942d0/jipusirizoleza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67d02f91-7c6a-4caf-9633-0a5996f5202b/ragilis.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_off0000b249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB249 4940 bytes
SHA-256: 74db2fec0669d35d49e8cccaaffbedd52a3f2c1d1e6a9f9f016192845476293e
font_01_sfnt_off0000c2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FC 12144 bytes
SHA-256: f8af58488abfea12ae806b3d06d8ac633cb79e95a47174f503881d3d17fd6dac

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