Malicious PDF — malware analysis report

Static analysis result for SHA-256 83bf03292c0176e7…

MALICIOUS

PDF

80.5 KB Created: 2021-03-08 23:40:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff058e069de6bfd86a092477b7196d89 SHA-1: 2cd49c85fc5360f18e3b603f9dd44a19b1da6f27 SHA-256: 83bf03292c0176e73c2c797c5bea55c1a2f95267a350d8ed302d5455da2f93f5
126 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, identified as a link farm. The primary malicious activity appears to be directing users to a network of external PDF files hosted on various domains, potentially for SEO manipulation or to serve further malicious content. While no scripts were directly extracted, the PDF structure and the nature of the link farm suggest a potential for embedding malicious JavaScript or exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/aws?utm_term=english+conversation+worksheets+for+beginners+pdf
    • https://vulopinuvi.weebly.com/uploads/1/3/1/1/131164419/6346f.pdf
    • https://sidatotivokusud.weebly.com/uploads/1/3/5/9/135959985/gudelewedepugami.pdf
    • http://jejufanafozotet.22web.org/what_is_the_main_criticism_of_differential_association_theory.pdf
    • https://cdn-cms.f-static.net/uploads/4460723/normal_60460d243e539.pdf
    • https://static.s123-cdn-static.com/uploads/4454984/normal_5ff3d383091c8.pdf
    • https://cdn-cms.f-static.net/uploads/4365621/normal_5fd3d63c3b9c2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lobulowigewimu.epizy.com/11693455024.pdf
    • http://xugonowelimije.epizy.com/50500360334.pdf
    • https://f1801c53-b3f5-4b94-a9b3-4bb8eb376a66.filesusr.com/ugd/af633f_85f66d27200a49ffa21f80f617ed1aac.pdf?index=true
    • http://telenusu.epizy.com/93946850842.pdf
    • https://35057dd6-1d18-4acd-96c9-af3b7fddc7cd.filesusr.com/ugd/978dd5_adbd007b3c8a4ae9817ec4cb5d8395d8.pdf?index=true
    • https://s3.amazonaws.com/dazinibonofobi/conjunctions_worksheets_with_answers_for_class_8.pdf
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_21f146db74fe40bc8317ff6b417bca24.pdf?index=true
    • https://s3.amazonaws.com/lekizopiloref/bugupenolajev.pdf
    • http://xojazexodiwosi.epizy.com/59475046779.pdf
    • http://ninalosuza.rf.gd/guluvevima.pdf
    • http://juxugalipexobow.epizy.com/83973940710.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb5e.bin
4fd9d4d29cc23267887fcf33d396c9b5051e7fe34b8e9a1a2f7367f89aadd790		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5E 5732 bytes
font_01_sfnt_off00010ef3.bin
1f9df656d260236a9efae3263209f6dddc18d5cb8ca7cec5ecf93618ffdbabb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF3 11052 bytes

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