Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b17706f4518780…

MALICIOUS

PDF

41.2 KB Created: 2020-04-06 09:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c7da5275efc6a3b35bead6f833ea0362 SHA-1: 5f13bb885a350caabed9936db411c441744bbff0 SHA-256: a8b17706f4518780de2c754a9c40009577c88d1f9a8726b52d00aa9b96acd4e2
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 pointing to various domains, many of which appear to be part of a link farm. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are also present in the heuristic findings. This suggests the PDF is designed to redirect users to a network of sites, likely for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://cherishingeveryfiber.com/uploads/1/3/0/6/130604129/130604129.html#judith+butler+gender+trouble+summary
    • http://legacyfarmsllc.net/uploads/1/3/1/3/131381332/solawulakira-muden-moniju-kusazolujez.pdf
    • http://ryandysonlaw.com/uploads/1/3/0/7/130775247/waveguxubefedofibi.pdf
    • http://aipatents.net/uploads/1/3/0/7/130739987/zefoduwuwunadibaviwo.pdf
    • http://psychology4parents.com/uploads/1/3/1/3/131381762/navijalisa_riziwovevuvo_farufojazo.pdf
    • http://parkerkidsfirst.com/uploads/1/3/0/4/130476054/3091630.pdf
    • http://jesumene-hr.com/uploads/1/3/0/7/130739987/ferovapim.pdf
    • http://letsgetrealationships.com/uploads/1/3/0/7/130740536/navulitej.pdf
    • http://space-scale.com/uploads/1/3/0/2/130292007/zobumivemofekesezuza.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_off00007972.bin
faffb3b80dd7b35c347753e9f176aa7c9861a8ba97dba6632248de0612696066		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7972 7988 bytes

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