Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4bf0dd7b7b86cd4…

MALICIOUS

PDF

38.7 KB Created: 2020-03-31 02:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bd66d13ee5b0a12ece70efd837d35b98 SHA-1: bc10e51fe9de93d0d67087feba50381133bdf045 SHA-256: e4bf0dd7b7b86cd4daac9281f3f28d976795f35264570d7c005f9e460d470edc
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, a technique often used for SEO poisoning or to distribute malicious payloads. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains a title related to tropical animals and references to wkhtmltopdf, suggesting a lure document. The primary attack pattern involves directing users to a vast network of linked PDF files hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://permaculturefoundationofhawaii.com/uploads/1/3/1/0/131071056/131071056.html#animales+del+clima+tropical+humedo
    • http://biofence.net/uploads/1/3/0/7/130739633/8cd2ce07bccd42.pdf
    • http://gtwutu72.org/uploads/1/3/0/7/130776818/4113885.pdf
    • http://maxzubatsky.com/uploads/1/3/0/7/130775282/311333.pdf
    • http://szjsolutions.com/uploads/1/3/0/8/130874678/kisolowedokiverenuw.pdf
    • http://cvfornewzealand.com/uploads/1/3/0/3/130313127/c31c11801.pdf
    • http://verysophisticatedbyval.com/uploads/1/3/0/7/130739196/legevajez.pdf
    • http://glfwarriorsempoweringmfh.com/uploads/1/3/0/5/130541677/xepajezujasin_kurizapu_winemo_tenug.pdf
    • http://mullentesting.com/uploads/1/3/0/6/130604153/pasojenak_bigenoduvi_welofuzogopav_wadijud.pdf
    • http://ntxsportswear.com/uploads/1/3/0/5/130539846/31604a45a.pdf
    • http://nappermusicandmore.com/uploads/1/3/0/4/130490155/4206449.pdf
    • http://solarfacil.net/uploads/1/3/0/7/130739015/zakosigabavipikeve.pdf
    • http://katalayaskincare.com/uploads/1/3/1/1/131164077/rovatifebotulup_kulipomogot_letijunazo.pdf
    • http://manorofthyme.com/uploads/1/3/0/6/130605124/4509248.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_off00006bee.bin
48ba330082c136c3b3563bfb35c178ee1cf49104057becb9e3c6e55671200bdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BEE 8916 bytes

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