Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ed9cbf5339c8b3b…

MALICIOUS

PDF

42.7 KB Created: 2020-03-21 15:04:48 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bf25ae12f6a601fc60dd9a49b9b4fb65 SHA-1: a934c5e88b00b56367c2bf96fe1d75d6b76b397b SHA-256: 2ed9cbf5339c8b3b2c79493af8d94f6a2a49d4f617f627aab91c3b2e9d552516
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 spam or to distribute malicious payloads. The ML classifier strongly indicated maliciousness. The document body contains garbled text but also includes a URL that is repeated in the heuristics and IOCs, suggesting a primary lure. No scripts were extracted from this sample.

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://pragueprivatetransfers.com/uploads/1/3/0/6/130639212/130639212.html#cubo+de+un+binomio+ejercicios+resueltos+con+procedimiento
    • http://jlgaproperties.com/uploads/1/3/0/7/130738542/8cb0757.pdf
    • http://bunrunners.net/uploads/1/3/0/2/130271250/81333a03ad.pdf
    • http://omarysuli.com/uploads/1/3/0/5/130588905/2270398.pdf
    • http://enduremods.co/uploads/1/3/0/9/130969957/zavosama.pdf
    • http://koehnlawns.com/uploads/1/3/0/8/130874490/rawitajeparobax_juwupusatovuwa_zimurawaweni.pdf
    • http://antoniobuehler.com/uploads/1/3/0/6/130603808/gagubemowepek_fedujawagom_fupanapu_paleborujab.pdf
    • http://rayszmigiel.com/uploads/1/3/0/6/130604032/65424304b2.pdf
    • http://adkrobinson.com/uploads/1/3/0/3/130313106/diginoxeri_vedukeva.pdf
    • http://freshfoodfusion.com/uploads/1/3/0/5/130551390/6829109.pdf
    • http://leafsalad.com/uploads/1/3/0/3/130379769/8073829.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_off000064b5.bin
9e562338bee138fc13e78d79a4dfadb519efcac8109cb32321fea3c8a42d1bd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64B5 8760 bytes
font_01_sfnt_off000084ea.bin
016a599efb949376b2a6aab1104af453b893fa8093d0e96f1bee9331455d2b97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84EA 16408 bytes

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