Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4dcedabf80e8475…

MALICIOUS

PDF

29.8 KB Created: 2020-04-09 06:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2021-10-14
MD5: b1be8e5a768d52fecf9e7d392ec21fdd SHA-1: 21900b419aaa342a6f53d83ad24071e8d49d43f0 SHA-256: d4dcedabf80e847539f6f57f4e61706afc5fcd7ff9f566a5e3d65c45aaeaf0fa
96 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to other PDF files hosted on various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates this is likely a link farm or SEO manipulation tactic. While no scripts were directly extracted, the embedded URLs suggest a pattern of redirecting users to potentially malicious content, possibly as a first stage in a phishing or malware distribution chain.

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 http://jnaplumbing.com/uploads/1/3/0/4/130489771/130489771.html#find+the+continents+and+oceans+worksheet+answers PDF link annotation
    • http://royalrentals.org/uploads/1/3/0/2/130271094/barakifup.pdfIn PDF document text
    • http://makeupbycamille.com/uploads/1/3/0/9/130969604/rubup.pdfIn PDF document text
    • http://concoctionsinc.com/uploads/1/3/0/3/130323324/2585714.pdfIn PDF document text
    • http://mthermonministries.org/uploads/1/3/0/2/130287533/ziburetoserogasas.pdfIn PDF document text
    • http://landlchildcare.org/uploads/1/3/0/4/130476262/124ef8b84041c73.pdfIn PDF document text
    • http://clearmeup.net/uploads/1/3/0/2/130288926/1432255.pdfIn PDF document text
    • http://epidigital.com/uploads/1/3/1/4/131453222/xazasili.pdfIn PDF document text
    • http://postmaster.iki-cc.jp/uploads/1/3/1/4/131437858/jogexasuz.pdfIn PDF document text
    • http://12domainjt1.com/uploads/1/3/0/5/130551351/9901661339e86.pdfIn PDF document text
    • http://seminolecreationz.com/uploads/1/3/1/3/131384495/pazefupil_ragekolese.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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D67 6824 bytes
SHA-256: ddd1ac51f9c88d8c8af8613fd67018320ad4de569fb9d2b3f49e843d3366f72a

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