Malicious PDF — malware analysis report

Static analysis result for SHA-256 46500a11dac2030c…

MALICIOUS

PDF

37.9 KB Created: 2020-11-09 15:10:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 66466b0ab2accdf4ef33117eedd226f6 SHA-1: eda9410044bbbe5689dbbc8ad1e95056625e9fc4 SHA-256: 46500a11dac2030cdfa7557127e91601788f1e116de74d1b122f9123064769d9
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on Weebly and other platforms, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a study guide. The ML classifier strongly indicates maliciousness, and the presence of numerous external links is a common tactic for distributing malware or phishing content.

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://trafftec.ru/aws?keyword=animal+farm+study+guide+answers PDF link annotation
    • https://tedumuwoke.weebly.com/uploads/1/3/1/3/131397970/nureparor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383445/normal_5f8c9b21722d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374984/normal_5fa4c6a713e48.pdfIn PDF document text
    • https://veraroligesabo.weebly.com/uploads/1/3/4/3/134377370/1382829.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366662/normal_5f9db7cd790d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384325/normal_5f935717210da.pdfIn PDF document text
    • https://resudejo.weebly.com/uploads/1/3/4/4/134471902/1020030.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365606/normal_5f872d8d3c70d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426425/normal_5f9894cd80401.pdfIn PDF document text
    • https://senobatupubem.weebly.com/uploads/1/3/1/4/131437889/fovilatema.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366324/normal_5f87274ab3089.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422377/normal_5f9b2602bee38.pdfIn PDF document text
    • https://fisizupesaxog.weebly.com/uploads/1/3/1/6/131636899/wutavovi.pdfIn PDF document text
    • https://dafanifupo.weebly.com/uploads/1/3/4/6/134645493/6529470.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383568/normal_5f970a7dd84f9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000056f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56F1 5412 bytes
SHA-256: 039e0111592bba9209617b01c8106cc0df5f4373d34435880ab9ab55a1a7957a
font_01_sfnt_off00006955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6955 9688 bytes
SHA-256: 7a13e9cfeb0e33f48d8177d9281dd50148b9018f733a282b56d79363f4964290

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