Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c195cdcb88dfc4…

MALICIOUS

PDF

67.5 KB Created: 2020-11-09 12:52:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e54d678c0cd03a4d7ce2dd96da918223 SHA-1: 1770b29b6a12c21f34841f59eb1ca60ac2f2f90b SHA-256: f9c195cdcb88dfc4d54aa306e1521565ece9d4048cb82669efd0145e60d5ce93
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://traffine.ru/aws?keyword=artifact+created+in+20th+century PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411686/normal_5f93fc10c3693.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368741/normal_5f880921cd930.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382974/normal_5f95411986e9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375353/normal_5fa130187a5b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420903/normal_5fa15dafc9bc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374835/normal_5f9723b30d8e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374710/normal_5f8e5cae1895e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381988/normal_5f8bde192fb7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410030/normal_5f9af6e8d9ec0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380213/normal_5f8eb2d9e22d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368956/normal_5f92999bb9183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454042/normal_5fa1df671ab0c.pdfIn PDF document text
    • https://rarowovi.weebly.com/uploads/1/3/4/6/134664267/310149.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/wilugugo/31324137308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fda3aa26-8439-459b-bea3-8279432ff751/40160981276.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/matching_animal_worksheet_with_pictures.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_off0000ca2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2A 5264 bytes
SHA-256: b00866b9f14f07cbaa31e4d6f936bd34d94076134053c46700cd0665cf5695bf
font_01_sfnt_off0000dc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC10 11592 bytes
SHA-256: f36e030be5bee514967e466f568d4e56f8a2be4702a1425ffa3485b8625b29e2

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