Malicious PDF — malware analysis report

Static analysis result for SHA-256 4151ae4fb7066e52…

MALICIOUS

PDF

30.5 KB Created: 2020-04-19 17:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0d78baa860b9e34d6b492a410ebed3c6 SHA-1: b2a101386654079396b0f29dfdb277843e47e7cf SHA-256: 4151ae4fb7066e52687d4c3fcf4b6417378a1991563e387a338c93aa8f65e013
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a large number of external links to various domains, a technique often used for SEO poisoning or to distribute further malicious content. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the PDF structure itself suggests a malicious intent to redirect users to a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://audiofidelity.no/uploads/1/3/0/5/130546457/130546457.html#farmers+stockyards+flemingsburg+ky+market+report
    • http://atruelovestory.net/uploads/1/3/0/2/130289238/lotuzumid.pdf
    • http://ezypropertysolutions.net/uploads/1/3/1/4/131437766/747cb19db16b.pdf
    • http://scsbrand.com/uploads/1/3/1/1/131164114/14a81511.pdf
    • http://feniceboutique.com/uploads/1/3/1/4/131408353/nejatiwalu.pdf
    • http://ashleyerinenglish.com/uploads/1/3/0/5/130545421/titojurigivus_fedafala.pdf
    • http://essentialwellnesswithkelly.com/uploads/1/3/1/3/131383651/2002267.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_off00004dca.bin
d260ba23dbb5454f43ed1ab4afaaa68af399be8c9c1875aa79b10a1100180ba7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DCA 7796 bytes

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