Malicious PDF — malware analysis report

Static analysis result for SHA-256 943e4fc79d09a8c7…

MALICIOUS

PDF

43.4 KB Created: 2020-11-07 16:39:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c08f9268040fa2c69390eab55a818e03 SHA-1: d75c508c4bd81b53ec9e7ddb461e185232468ce7 SHA-256: 943e4fc79d09a8c770314ea9c361c517ec49fcb5452a1d6da63bfb1ada7e870a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://traffking.ru/123?keyword=jamis+road+bikes+2016 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374198/normal_5f9039fe91e7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403121/normal_5f9eb09e7abac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369150/normal_5f9e8d45985cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414494/normal_5f96f31a49356.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://zidurezinale.files.wordpress.com/2020/11/8204752957.pdfIn PDF document text
    • https://kuwanuje.files.wordpress.com/2020/11/shahab_nama_first_chapter.pdfIn PDF document text
    • https://fefitaw.files.wordpress.com/2020/11/64939725781.pdfIn PDF document text
    • https://lodoxepal.files.wordpress.com/2020/11/vibinofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d10d45d-b70b-4b8a-b080-16c367218e38/19226940884.pdfIn PDF document text
    • https://losorul.files.wordpress.com/2020/11/pokezobuluxovijeru.pdfIn PDF document text
    • https://wotenopofe.files.wordpress.com/2020/11/budixaw.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_off00006ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC0 5612 bytes
SHA-256: 8953033864cfb047f5c0a0d69f5b6ab8ac287a2374499084aec092bf13d73598
font_01_sfnt_off00007dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC2 10440 bytes
SHA-256: ba79f355f5fe1886cc303343ce008d1709129a5b7f8d69d39a669ff9dd8833c0

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