Malicious PDF — malware analysis report

Static analysis result for SHA-256 25192b5bbfac9a62…

MALICIOUS

PDF

32.1 KB Created: 2020-06-05 03:40:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a63cf5f90e1658a70f7c8a956bbdbf29 SHA-1: fb71faeed87e483df7a3ec229f70412f157e24e6 SHA-256: 25192b5bbfac9a621c7aaa72f90b587b93a142774e8a9ca95aa9a7ef90d58163
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing:Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF document contains a large number of external links, many of which point to similarly structured URLs on different domains. The document body text, though partially obfuscated, mentions 'Custom lego instructions' and includes URLs that appear to be part of a link farm or SEO spam campaign. This suggests the document is designed to drive traffic to potentially malicious websites, likely for phishing or malware distribution. The ML classifier strongly supports the malicious verdict.

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://carpetcleancary.com/uploads/1/3/0/5/130551714/130551714.html#custom+lego+instructions
    • http://premierhomebuilders.net/uploads/1/3/0/6/130621601/9699816.pdf
    • http://jrpilotcar.com/uploads/1/3/1/4/131410662/5742254.pdf
    • http://precisionsocceracademy.net/uploads/1/3/0/6/130622084/xawujimuvizenakelej.pdf
    • http://g3muse.com/uploads/1/3/0/2/130289669/dc0eb.pdf
    • http://medconnectnz.com/uploads/1/3/0/9/130969824/vagulatotudafawa.pdf
    • http://shop.caldwellcigars.com/uploads/1/3/1/4/131407316/e3968769a.pdf
    • http://justinllovesjunk.com/uploads/1/3/0/9/130969551/befuke.pdf
    • http://do-protect.com/uploads/1/3/1/4/131453539/norufuvixidoril_jukadotixu_wopuz.pdf
    • http://cpanel.workinnvision.com/uploads/1/3/1/4/131437594/letagumuputar.pdf
    • http://carpetcleancary.com/uploads/1/3/0/5/130551714/terms.html
    • http://carpetcleancary.com/uploads/1/3/0/5/130551714/dmca.html
    • http://carpetcleancary.com/uploads/1/3/0/5/130551714/policy.html
    • https://zepowep.files.wordpress.com/2020/06/97496921946.pdf
    • https://dekupuwapo627084595.files.wordpress.com/2020/06/merekofenuk.pdf
    • https://kufopamasez.files.wordpress.com/2020/06/sizupapopezemerab.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_off0000510b.bin
0db121109a7a12208391f23ed6f922958d06cdb4dd33f9e882e70d36e4cf6ab0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x510B 10892 bytes

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