Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d5a5e4a44dd362…

MALICIOUS

PDF

49.4 KB Created: 2020-04-22 01:40:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a302d9d3abae1810973e4812cc4c10fa SHA-1: 6eeec621ba6c2ef67d7e6fc4372087be9d09202d SHA-256: b7d5a5e4a44dd36236b63fdaca80e949cb7a35db6cb229f2312f2b1e5db77d60
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files with numeric slugs, indicative of a link farm or SEO abuse tactic. The document body, though heavily obfuscated, contains text related to worksheets and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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://thewiresculptures.com/uploads/1/3/1/3/131380564/131380564.html#completing+grouped+frequency+table+worksheet
    • http://luxetraveldestinations.net/uploads/1/3/1/6/131606720/sazutitefudu.pdf
    • http://womensempowermentministries.com/uploads/1/3/0/5/130588451/kerojuvo_luvoloj.pdf
    • http://naturesworks.net/uploads/1/3/0/8/130813787/kuwitu.pdf
    • http://hopeforpets.net/uploads/1/3/1/3/131382907/1303729.pdf
    • http://coronadohealth.com/uploads/1/3/0/6/130639651/xobuniva-ketaf-gased.pdf
    • http://rjcollins.info/uploads/1/3/1/4/131453665/1579239.pdf
    • http://foxxtrans.com/uploads/1/3/0/4/130483871/5820653.pdf
    • http://metcalfe4pa.org/uploads/1/3/0/4/130435803/rasorarovipiw-xegajalapik-sonime.pdf
    • http://fasttowingservice.co/uploads/1/3/0/9/130969707/a0832.pdf
    • http://elcaravan.com/uploads/1/3/0/4/130483136/tiduje.pdf
    • http://mattressdiscountstore.net/uploads/1/3/0/5/130539099/3501766.pdf
    • http://drandreasmarx.com/uploads/1/3/0/8/130813378/1616338.pdf
    • http://algesiology.com/uploads/1/3/1/4/131453076/1324841.pdf
    • http://zhuangguo94.com/uploads/1/3/0/8/130874121/1d6198014ff91a7.pdf
    • http://makeupbytaylorp.com/uploads/1/3/0/6/130639129/jovuzezupozafonel.pdf
    • http://zhuangguo94.com/uploads/1/3/0/8/130874121/1d619
    • 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_off00009879.bin
63bf52604ea52e87a06349cfdd43dee26b6a268dfafb2b32eb682663c716f106		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9879 8480 bytes

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