Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d73484fb24ed03…

MALICIOUS

PDF

36.3 KB Created: 2020-04-15 18:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 96f58e2da270f43d89ec3f423fe5f725 SHA-1: f7bdbd8dd1e0728f4ebb51a3018abc1bff04a609 SHA-256: 21d73484fb24ed03bbd2559ec3d500ec5cbcf7f7c7b572443e5b568ca96469ba
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains, suggesting a link farm or SEO abuse for distributing malicious content. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a care sheet. The ML classifier strongly indicated maliciousness, and the PDF structure itself is flagged for containing a mass external link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://minnesotahydrographics.com/uploads/1/3/1/3/131380397/131380397.html#green+bush+rat+snake+care+sheet
    • http://reinbvinterieurbouw.nl/uploads/1/3/0/7/130739652/12e20fd9141c6.pdf
    • http://massagebytessie.com/uploads/1/3/1/0/131071166/dadisakelubun_pevopiz.pdf
    • http://olympialawpc.com/uploads/1/3/0/4/130488812/folekunozal.pdf
    • http://galileobrazil.com/uploads/1/3/0/4/130488371/selenikivulopawobugi.pdf
    • http://ns1.pama.org/uploads/1/3/0/8/130874472/69072.pdf
    • http://padrejoseblog.com/uploads/1/3/0/7/130739814/losewuvekoraluwineki.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_off0000651d.bin
5db6edf9125ebeb7ddb6c7e33a486bab5a820c3dc494f4ea049d1bfac7ec967e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x651D 8552 bytes

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