Malicious PDF — malware analysis report

Static analysis result for SHA-256 7abce0a57e43e066…

MALICIOUS

PDF

27.3 KB Created: 2020-04-05 16:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2157617f762e9f96dda2aa28b595d506 SHA-1: 1bf36069e35a407a68b947db74d6ca1f7daf40d2 SHA-256: 7abce0a57e43e066bec5e02eb0d11cbf0710951af18abd9247257922c455f265
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://wilmingtonladiesteawalk.org/uploads/1/3/0/8/130814902/130814902.html#saath+nibhaana+saathiya+episode+1+youtube
    • http://travelatyourleisure.com/uploads/1/3/1/3/131384082/6313947.pdf
    • http://katiejacewicz.com/uploads/1/3/0/4/130489230/2879b5ab7.pdf
    • http://kwspecialeducationhelp.com/uploads/1/3/1/1/131164130/xoxebema.pdf
    • http://cta-nea.org/uploads/1/3/0/4/130476385/ab902f9.pdf
    • http://bridgetbloodphotography.com/uploads/1/3/1/3/131383761/6871798.pdf
    • http://kcmoboys.com/uploads/1/3/0/8/130814226/xebexisaregalefobad.pdf
    • http://deniserodgersart.com/uploads/1/3/0/9/130969052/38eeb05a91.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_off000047f8.bin
892c278821bdde6a2969d9bc22998fa4637287eef2dba9d9d9ecdd79acaca4c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47F8 6092 bytes

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