Malicious PDF — malware analysis report

Static analysis result for SHA-256 8092e5f9ba7a7c1d…

MALICIOUS

PDF

30.6 KB Created: 2020-04-03 15:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f9bee92918a7017dd67423fe86994e77 SHA-1: 8c68238dd0a3d881f90f5b919289982d9f8cc4db SHA-256: 8092e5f9ba7a7c1d0a67e0a63c50648990c767cbdf6693050fd1b8e97aa1232d
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains that appear to be part of a link farm. The ML classifier strongly indicated maliciousness. The primary attack pattern involves luring users to these external sites, which could host further malicious content or phishing pages. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://julianthology.com/uploads/1/3/0/8/130874025/130874025.html#rigol+dsa832e+hack
    • http://capitalmetal.com/uploads/1/3/0/9/130969509/dfb075e92f84.pdf
    • http://glynnsoftwaretutoring.com/uploads/1/3/0/7/130739529/robidotikuwusopiba.pdf
    • http://thehaiticooperative.org/uploads/1/3/0/6/130639511/99db3.pdf
    • http://bigfishlake.org/uploads/1/3/1/4/131453892/zibapi.pdf
    • http://spicemason.com/uploads/1/3/0/6/130604582/jijakike.pdf
    • http://beyondconnect.net/uploads/1/3/0/3/130323182/62c84b67d30.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_off00004e03.bin
d1ece9e9c1c0e84eb45f50f582080da727ff173cbc55babae832ac42dd1f4932		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E03 7944 bytes

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