Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a43f7bd8eb17860…

MALICIOUS

PDF

32.2 KB Created: 2020-05-27 05:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2941ad1f9154eecdbd0a829097e62b07 SHA-1: 31b226e14bdff299ed1ee43e2d5cef6fe1e8db08 SHA-256: 1a43f7bd8eb17860bacfdf7ac5623b7bd8b1ee3ab0cd0077c24e9d640332cfa6
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs likely serve as a distribution mechanism for further malicious content or for SEO manipulation purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mahaservice.net/uploads/1/3/0/3/130323390/130323390.html#transformer+rectifier+unit+for+catho
    • http://camelotcostruzioni.com/uploads/1/3/1/6/131606472/nolobenature_befigujak.pdf
    • http://poweryogaflow.com/uploads/1/3/0/8/130814337/mukalasarozom.pdf
    • http://abigailklassen.com/uploads/1/3/0/5/130588511/modebisoxizuw.pdf
    • http://salemtuscanvillages.com/uploads/1/3/0/2/130289204/buzepufof.pdf
    • http://ryanjalls.com/uploads/1/3/0/3/130323717/4956416.pdf
    • http://gardenofmusic.org/uploads/1/3/0/6/130604179/9850639.pdf
    • http://highcourtupholdsanarchydecision.com/uploads/1/3/1/6/131636960/9099286.pdf
    • http://mrschillistreats.net/uploads/1/3/1/3/131398221/7138702.pdf
    • http://jrselectric.net/uploads/1/3/0/5/130539450/rawigireni.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053b9.bin
cc723c293d4aa64dc25d8c8108c13676f94aaedfcfa8042e0a6be02b2d151c32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53B9 9988 bytes

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