Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c429e9c6c748a2f…

MALICIOUS

PDF

38.3 KB Created: 2020-11-05 16:44:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c672ae94ed6104eaca8bbfcefb781ce4 SHA-1: 2ef54ece2a70cd335f508f17f941e13a59304a9f SHA-256: 3c429e9c6c748a2f868ca71ceb9a67cede53080e282f342c6f748cbd7bb85939
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable hosting services, suggesting a link farm or SEO spam operation. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffset.ru/aws?keyword=noun+and+verb+identification+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381756/normal_5f96861726606.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_5f8e6bc520933.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370268/normal_5f9cf3752f1bc.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/7557758.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386366/normal_5f98de524f607.pdfIn PDF document text
    • https://jigaxamika.weebly.com/uploads/1/3/4/6/134610035/dapitutoro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377401/normal_5fa1fea26b468.pdfIn PDF document text
    • https://xonuveviriniw.weebly.com/uploads/1/3/0/7/130738603/7dc0ea71b02.pdfIn PDF document text
    • https://vumevomuw.weebly.com/uploads/1/3/4/3/134335884/f45a30b0.pdfIn PDF document text
    • https://sakukavazu.weebly.com/uploads/1/3/1/3/131379729/rafanotovi-duvibu.pdfIn PDF document text
    • https://rikisuluwujufa.weebly.com/uploads/1/3/1/4/131452938/a0e63384eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369329/normal_5f91e504ee61f.pdfIn PDF document text
    • https://removevas.weebly.com/uploads/1/3/4/4/134443453/bopifufiwu.pdfIn PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/7844104.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/xumupafav.pdfIn PDF document text
    • https://jowamevo.weebly.com/uploads/1/3/4/5/134511132/jiderujudewubi_nobuvuf_tamexomepijofa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_5f955aca429fd.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_off000056ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56AD 5400 bytes
SHA-256: eaa9d19664946760837e1717245336d08f9c0df96cad2be65c0c47b2ad5f5758
font_01_sfnt_off00006924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6924 10328 bytes
SHA-256: 7a4869b4a72a7941ea66b33f2a0d46a6e4b498b13ec1c7d8ef0ae8280d4a6509

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