Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ebb4a9058fa33f7…

MALICIOUS

PDF

41.2 KB Created: 2020-04-12 15:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a251366cace99469d79c85be6bca8444 SHA-1: 8071e39be6541fc64ab3ea62060caf454c55574d SHA-256: 1ebb4a9058fa33f72c43c3f658853c0da4fe1b9c38bb7083a70dc16e1016c0b3
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files with numeric or book-related slugs on various domains. This pattern is indicative of a link farm or SEO poisoning technique, likely intended to drive traffic to malicious sites or host further payloads. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://katherinejwang.com/uploads/1/3/0/4/130488839/130488839.html#bachelor+pad+economics+epub
    • http://matrixcarpetbinder.com/uploads/1/3/0/6/130605324/5884665.pdf
    • http://koinoniaconference.com/uploads/1/3/0/4/130488780/5836268.pdf
    • http://dennyhomes.com/uploads/1/3/0/8/130874511/wekaga-nejerawupemeguz-xupexa.pdf
    • http://jensenprotocol.com/uploads/1/3/0/6/130604420/lekamuje.pdf
    • http://everydayoracleandtarot.com/uploads/1/3/0/8/130873842/18eff2d074.pdf
    • http://funclubdesigns.com/uploads/1/3/0/8/130873869/gasefopef_rizexiw_dakeguv.pdf
    • http://doctors-daughters.com/uploads/1/3/0/6/130620379/8037482.pdf
    • http://coastalfundcontrol.com/uploads/1/3/0/6/130604465/rixudozosu-wewowiguruteki.pdf
    • http://bridgnorthwalkingclub.org/uploads/1/3/1/4/131411341/234093.pdf
    • http://lookatmeswimschool.com/uploads/1/3/1/3/131383674/9152392.pdf
    • http://lookatmeswimschool.com/uploads/1/3
    • 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_off0000791b.bin
942ac4362f8e3a6711f7da85f2c1229439b8247fc1b6aad037b91dba911e64e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x791B 8320 bytes

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