Malicious PDF — malware analysis report

Static analysis result for SHA-256 351a141ed790adcb…

MALICIOUS

PDF

49.7 KB Created: 2020-04-27 18:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dab7d63cd5c4a0ab015f78d35af9678f SHA-1: d378eb864253ea39a0bc74c71abf49b9b99d705b SHA-256: 351a141ed790adcbcf5eca1aacdec8b02a705ccfa585eca2582b1bff168a28ee
96 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier with high confidence. It contains a significant number of external links, a technique often used to create link farms for SEO poisoning or to redirect users to phishing sites. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a mass of external PDF links, suggesting a coordinated effort to distribute malicious content. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine a more specific attack pattern beyond link-based redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://michaelrosebaby.com/uploads/1/3/0/5/130538891/130538891.html#nms+next+frigate+guide
    • http://stjohnlutheranchurchjenison.org/uploads/1/3/0/4/130489006/b5abb039.pdf
    • http://jkseamlessgutterinstallers.com/uploads/1/3/0/6/130639107/ruluwu.pdf
    • http://jamiefehr.com/uploads/1/3/1/1/131163832/9461032.pdf
    • http://mail.marinakolovou.com/uploads/1/3/1/6/131606325/banukewojo.pdf
    • http://aurionadvisoryservices.org/uploads/1/3/0/6/130604531/mefalevoloraboweraze.pdf
    • http://jkseamlessgutter
    • 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_off00009c58.bin
dd5cd98f95740993fc0f2c8d47a635e31c11d68f5216903bd7da445b4d641c3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C58 8052 bytes

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