Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b6ec3e2189a417…

MALICIOUS

PDF

49.2 KB Created: 2020-11-08 18:25:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 3f17f76c0d14f522ce78a9c176d33012 SHA-1: 92632d08f1f7b1d69230c12ccf9dade2191e3c5c SHA-256: 59b6ec3e2189a417cbf85e3c19cb368cb403315955fc25189071231b7406f8f7
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://traffnew.ru/123?keyword=army+manual+dispatches PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446272/normal_5f9f5bd94710b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380078/normal_5f8c7abbf1f3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404116/normal_5fa7adb0c2e89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454164/normal_5fa3535772211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372076/normal_5f893d6225fe7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://remetipokuv.files.wordpress.com/2020/11/47008163834.pdfIn PDF document text
    • https://tilunen.files.wordpress.com/2020/11/lean_canvas_unfair_advantage.pdfIn PDF document text
    • https://wisevojinu.files.wordpress.com/2020/11/lababazagijoxixexelufogal.pdfIn PDF document text
    • https://zuzoxet.files.wordpress.com/2020/11/lowokotanibutelol.pdfIn PDF document text
    • https://wupolekofajo.files.wordpress.com/2020/11/66061233621.pdfIn PDF document text
    • https://felibule.files.wordpress.com/2020/11/41244477441.pdfIn PDF document text
    • https://likuzow.files.wordpress.com/2020/11/40264502684.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_off00007f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F08 5404 bytes
SHA-256: ea325daeacc032ed9bfb9fe5f9d40eef10fb1df94f2b57e717c973cca3227112
font_01_sfnt_off00009141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9141 11084 bytes
SHA-256: d1f186abcbfd138b8ed3d86d1af5c5a5dab991298fd402a3614573c2625f0ec1

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