Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a7727a0c792998…

MALICIOUS

PDF

54.2 KB Created: 2020-04-17 00:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b6d4f5a40ec1837ba2eceee6c84d2e62 SHA-1: 5921fe8a86118405e373d689ce782d0fed14fe13 SHA-256: e9a7727a0c7929989381e03f216a84e41fd8aa2b9fe5fd99735bcb3ce5213640
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files on unrelated domains, suggesting a link farm for SEO manipulation or to host malicious content. One of the embedded URIs, 'http://sweattafit.com/uploads/1/3/0/7/130738819/130738819.html#interview+questions+and+answers+for+admin+clerk', is presented as interview questions, likely a lure to trick users into visiting a malicious site. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://sweattafit.com/uploads/1/3/0/7/130738819/130738819.html#interview+questions+and+answers+for+admin+clerk
    • http://musicandpeople.com/uploads/1/3/0/6/130621280/94c97df3.pdf
    • http://avyabhargave.com/uploads/1/3/0/6/130620624/ad4e27968ab.pdf
    • http://portclintonattorney.com/uploads/1/3/1/4/131406966/dilomivesoteze.pdf
    • http://seashoreinvestments.com/uploads/1/3/0/6/130639197/e87ddc946f4.pdf
    • http://invivonetwork.com/uploads/1/3/0/6/130620758/2909611.pdf
    • http://ongarcompany.com/uploads/1/3/1/4/131406082/dajatudusag.pdf
    • http://myshuti.net/uploads/1/3/0/2/130288854/3ea6f5eff3ad0.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009609.bin
165f74f83b149a7d4f73995c4927a0097cd0505a59ac907657a12598f6985969		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9609 7864 bytes
font_01_sfnt_off0000b4a9.bin
c9e64c130615f0007dddd09b847c7eae4bb540d197d2c258f21a2409e8fb6768		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A9 16280 bytes

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