Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c2b6ac36b78799…

MALICIOUS

PDF

40.4 KB Created: 2020-04-16 09:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0678d55571cd65868b7b63cbebe184db SHA-1: acf866b237c1a3b9c14e27610f441241bfd6ae9e SHA-256: f7c2b6ac36b78799c0b3419b1903960f6412ead4c8c5649a5d2d5f0b700da9f7
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 similarly structured URLs on various domains, indicating a link farm or SEO poisoning attempt. One of the primary links, http://efficientrecyclingsolutions.com/uploads/1/3/0/3/130313783/130313783.html#kinemaster+chroma+key+file, suggests a lure related to software features. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://efficientrecyclingsolutions.com/uploads/1/3/0/3/130313783/130313783.html#kinemaster+chroma+key+file
    • http://fjbinc.com/uploads/1/3/1/4/131437976/fowowagezoso_pexiwaroduga_nopiwikeki_dobuzodiwu.pdf
    • http://sharklifebrand.org/uploads/1/3/0/6/130621646/wivilowox_bamene_gewum.pdf
    • http://thenerdfather.com/uploads/1/3/0/7/130738553/ec04f367aba.pdf
    • http://acutedialysisllc.com/uploads/1/3/0/6/130621334/vuzigerixed.pdf
    • http://cristinazorrillaart.com/uploads/1/3/0/5/130551239/semirimupug-nuxipo.pdf
    • http://cmcgill.com/uploads/1/3/0/5/130590739/841d728fd18.pdf
    • http://gninvictus.com/uploads/1/3/0/9/130969724/vamafunojuji.pdf
    • http://djlawofsin.com/uploads/1/3/0/7/130739712/749336.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_off00006146.bin
6384fc8f47dd762d57d2598a180822b1dd4a40ed6e5bec245ef33b4fda4d33c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6146 8232 bytes
font_01_sfnt_off000080f4.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80F4 16036 bytes

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