Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a1c23c6b2d369af…

MALICIOUS

PDF

43.9 KB Created: 2020-04-02 04:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 06d19138d884595065ecb11a24f2a53a SHA-1: b88a7fe680f1a79d72a215bf3ee095fb3283f131 SHA-256: 9a1c23c6b2d369afdb8e735d4ae5f3622699455206cd269e8f2f2fccca05eb90
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, a technique often used for SEO poisoning or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior. No scripts were extracted, but the extensive link farm suggests a delivery mechanism for other threats.

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://purerockcolours.eu/uploads/1/3/0/3/130323250/130323250.html#stress+concentration+factor+hole+in+pipe
    • http://thedecenthuman.com/uploads/1/3/0/3/130379226/5e3e4d1a20041e8.pdf
    • http://primerealtygroup.biz/uploads/1/3/0/4/130435986/gegudisu.pdf
    • http://horncomb.com/uploads/1/3/0/7/130739275/mijokodekom.pdf
    • http://machslibrary.com/uploads/1/3/1/1/131163910/wexik.pdf
    • http://circusattic.com/uploads/1/3/0/2/130270753/d8258b33ac3d29b.pdf
    • http://the-hill-top-salesonline.com/uploads/1/3/1/3/131378921/xawironemoxilazupasi.pdf
    • http://streamkingztv.info/uploads/1/3/0/4/130483285/7409035.pdf
    • http://silvacounselling.com/uploads/1/3/0/2/130272070/6385685.pdf
    • http://pixiedustedcanadian.com/uploads/1/3/0/6/130639270/mufifaviduwa.pdf
    • http://disciplehouse.net/uploads/1/3/1/3/131379498/2292567.pdf
    • http://littleplumberontheprairie.com/uploads/1/3/0/7/130776055/c45411.pdf
    • http://mail.asifoundations.com/uploads/1/3/0/4/130488241/ed010b37762930.pdf
    • http://tulsicare.com/uploads/1/3/0/6/130639325/dijedetegoxura_jixudugevoxom.pdf
    • http://lowerhomefees.com/uploads/1/3/0/7/130776874/rizamowarot.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_off00007fbf.bin
df7bfc2cc67a3d56295b2cb4ad01297ca91f137ab923ef3d692c2ce8b1eb7fc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FBF 8772 bytes

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