Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4139c9df7db0be…

MALICIOUS

PDF

83.7 KB Created: 2020-04-30 00:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 953074f72f024354dcf9193866301184 SHA-1: b4894570ec4aa38ecd128105f17c680024978090 SHA-256: 0c4139c9df7db0be203e16831cb439e5767ad761e64bcca0d0f90fdd0806ca2a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous links to external websites, many of which appear to be part of a link farm designed to distribute further malicious content. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's designed to exploit vulnerabilities or trick users into visiting malicious sites. No scripts were extracted, but the presence of many external links points towards a downloader or redirector pattern.

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://bradleyryan.net/uploads/1/3/0/3/130323914/130323914.html#entertainment+company+website+template
    • http://gregoriodelolmo.com/uploads/1/3/0/4/130435956/47863.pdf
    • http://bioremediacionmexico.com/uploads/1/3/0/5/130551708/7742554.pdf
    • http://reneeandmathieu.com/uploads/1/3/0/3/130312920/6430999.pdf
    • http://market-techture.com/uploads/1/3/1/3/131380081/vazusigupo.pdf
    • http://venatouruk.com/uploads/1/3/0/7/130775813/mujeru.pdf
    • http://oliviaiannotti.com/uploads/1/3/1/3/131380707/f31aef912.pdf
    • http://charlibaptie.com/uploads/1/3/1/4/131482959/zomafavar_datita.pdf
    • http://getpaidpoolside.com/uploads/1/3/0/7/130739220/4128868.pdf
    • http://bookflashtrailers.com/uploads/1/3/0/5/130550847/zorojaro-jomimaw-miduzopa-molakolawafe.pdf
    • http://mamasaidbcs.com/uploads/1/3/0/7/130776542/lunobilaza.pdf
    • http://happybamboo.com/uploads/1/3/1/4/131454221/990248.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_off00012376.bin
98b4e8f9c5b1db83685ba80371e106af5d1a1ea4cfe5e0a117e68d52114c38ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12376 7844 bytes

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