Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e33b7ff9ffb86f1…

MALICIOUS

PDF

43.4 KB Created: 2020-04-15 07:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7b51dd37d8f306ce7e28ed4c7f87b196 SHA-1: 18c194f33dced86a8ca118396a06d6481be7b895 SHA-256: 6e33b7ff9ffb86f11f608889f4eb2e6185056dc7c93ccfeb27bf530913e71647
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the nature of the links suggests an attempt to redirect users to potentially malicious sites or for SEO spamming. The document body is heavily obfuscated and contains fragments of URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://treehuggerpaintings.com/uploads/1/3/1/4/131453805/131453805.html#steps+to++eclipse+for+selenium
    • http://gerberconsultancy.com/uploads/1/3/1/1/131164004/fotakunalaxu.pdf
    • http://iambrianodonovan.com/uploads/1/3/0/4/130476359/a88fa038.pdf
    • http://southernseasonslandscape.com/uploads/1/3/0/6/130604286/7028184.pdf
    • http://chapusa.org/uploads/1/3/1/4/131453967/6726940.pdf
    • http://carriagehouseoffices.com/uploads/1/3/0/2/130273907/9935693.pdf
    • https://www.y.9K
    • 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_off00007dfe.bin
a384e7f6d69981963f1806179e6f0c524f0e883f1ccddb1ae4d8bbd62de5855b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DFE 9540 bytes

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