Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a7f6293f521dc5…

MALICIOUS

PDF

32.3 KB Created: 2020-04-13 10:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f59c6ffd21bc560756109ffb8c79ca98 SHA-1: 8d35cc4cef362b014b600295a6ccc1630ce41752 SHA-256: c8a7f6293f521dc5ee149ecc8ec7270d496ff78ab0345e8078844ded45685728
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links to other PDF files hosted on various domains. This pattern is indicative of a link farm or a redirection scheme designed to obscure the ultimate malicious destination. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://spacecreationdesign.com/uploads/1/3/1/4/131453610/131453610.html#rheem+rgra-09ezajs+pressure+switch
    • http://hostmaster.the-remappingcompany.co.uk/uploads/1/3/0/8/130873979/6718660.pdf
    • http://www.connectyoursenses.com/uploads/1/3/0/4/130476642/8579739.pdf
    • http://motorclubbing.com/uploads/1/3/0/6/130604739/1c2b34740f.pdf
    • http://greenmangoco.com/uploads/1/3/1/6/131607278/zitose_bexonibunem.pdf
    • http://juniorproperties.biz/uploads/1/3/0/5/130588191/tavitive.pdf
    • http://glamwithgam.com/uploads/1/3/1/1/131164399/7b0e8a1bcc.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_off000055c4.bin
bd0c3d9e65c49d40335c6666b463549bcb9d48458949e34b43f91e155130081e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55C4 8368 bytes

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