Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a2c218a678d6710…

MALICIOUS

PDF

38.5 KB Created: 2020-06-03 01:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b162d898044c973c239b9acdf428b939 SHA-1: 0f57288cfe38a0ebf699d53d26f4d997a8b37b74 SHA-256: 1a2c218a678d67105d13413c8281fc5eef4d547ef935d9d11dc4faec39ab4b92
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains references to 'La princesse de cleves analyse' and the wkhtmltopdf generator, suggesting a lure to disguise the malicious intent of linking to numerous external PDF files hosted on various domains.

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://taiyangchengzongdaili.br3h.com/uploads/1/3/1/4/131453615/131453615.html#la+princesse+de+cleves+analyse
    • http://just-done.com/uploads/1/3/0/5/130543134/lumusovuguxak.pdf
    • http://city-sapien.com/uploads/1/3/1/3/131380175/2743121.pdf
    • http://scentzfromheaven.net/uploads/1/3/1/4/131453054/vitejuju.pdf
    • http://arcadiaenergyca.com/uploads/1/3/0/6/130639972/dofubozofokotuda.pdf
    • http://s2bp.com/uploads/1/3/0/5/130547112/nowuzekejizivo.pdf
    • http://taiyangchengzongdaili.br3h.com/uploads/1/3/1/4/131453615/terms.html
    • http://taiyangchengzongdaili.br3h.com/uploads/1/3/1/4/131453615/dmca.html
    • http://taiyangchengzongdaili.br3h.com/uploads/1/3/1/4/131453615/policy.html
    • https://zozozesunur.files.wordpress.com/2020/05/seralidakasozaxovilokikur.pdf
    • https://zafevilak.files.wordpress.com/2020/05/4097506039.pdf
    • https://pazavanew.files.wordpress.com/2020/06/9572987189.pdf
    • https://rugulamev976216160.files.wordpress.com/2020/06/kujerinofifi.pdf
    • https://rutaxitulos.files.wordpress.com/2020/05/wejojiwedo.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_off0000646d.bin
5039788d37d2fc0bd1a81c8e7bfd38bb6beceacd61ec37403368c1851399bfa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x646D 13380 bytes

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