Malicious PDF — malware analysis report

Static analysis result for SHA-256 f79a6cdb71260cf1…

MALICIOUS

PDF

37.7 KB Created: 2020-04-06 08:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ad66c2a018d16c70c265e3aaa82024f2 SHA-1: 2ed316a4ef9bc348742d398c10880c456433b1ba SHA-256: f79a6cdb71260cf133400454e2cbbd95b0de3604d4a95b3c22593564256fc7d9
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness. The primary attack pattern involves directing users to a network of linked PDF files hosted on various domains, likely as part of a link farm or to host further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://e-whimsy.com/uploads/1/3/0/8/130874518/130874518.html#reasons+for+unfavorable+labor+rate+variance
    • http://kuwaitmomsguide.net/uploads/1/3/0/6/130620628/27d9847.pdf
    • http://maritimeinsights.com/uploads/1/3/0/6/130639852/mupasavas.pdf
    • http://debbiesdesignerwreathsnv.com/uploads/1/3/0/2/130272591/9659174.pdf
    • http://raservicesonline.com/uploads/1/3/1/4/131453782/fb7e0102be65.pdf
    • http://musesamongus.com/uploads/1/3/0/5/130588384/6514988.pdf
    • http://campk-9doggiedaycamp.com/uploads/1/3/1/4/131483254/tuxefoketez.pdf
    • http://liveshenvalley.com/uploads/1/3/1/0/131070309/abd1d4e8fe2f7.pdf
    • http://redtruffleco.com/uploads/1/3/0/5/130588531/jezalapise_kalederaxewexo.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_off00006b38.bin
cc043241b69f0fb7a46802ad6a232bd94cdf66e5fc755b8f7e97b5352a10c296		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B38 7500 bytes

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