Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b11eb02f017f5d…

MALICIOUS

PDF

32.9 KB Created: 2020-05-25 19:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb1f1c56b4cf5370f9ed7843fd3fd221 SHA-1: 6edcbaf4fec2719bffc00fc4e747239997158d9f SHA-256: 88b11eb02f017f5d1c52471ba5e0a1785348919611df7dc6b3ef9df12b9df3f7
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The embedded document body also contains several of these URLs, suggesting a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious. No scripts were extracted from this sample, limiting the ability to determine a specific payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://357.undesirable.us/uploads/1/3/0/5/130588936/130588936.html#blank+map+of+europe+before+ww1
    • http://sweetnautical.com/uploads/1/3/1/8/131857112/dorogiwavoj.pdf
    • http://stayingsafe.co.uk/uploads/1/3/0/7/130739933/f8a541403fbc27.pdf
    • http://time2focus.net/uploads/1/3/0/5/130589171/6f92a5d4.pdf
    • http://you-hire.com/uploads/1/3/0/2/130289021/1431b9cf08c308a.pdf
    • http://robinsonrockshistory.com/uploads/1/3/0/2/130273884/tagunoso.pdf
    • http://stcroixdigitalmarketing.com/uploads/1/3/1/3/131398366/c7e87f03.pdf
    • http://lierreemeraldsllc.net/uploads/1/3/0/5/130539672/196978.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_off0000540b.bin
390efec52c949c6c34fcb2bfd90da08a9d39135a9259d2ab81221f44937090e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x540B 10600 bytes

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