Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7627c0652e8cb4…

MALICIOUS

PDF

36.0 KB Created: 2020-04-10 06:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bb3eb4171f64fd981bdf81e28f9bbc50 SHA-1: d4b920cfc75f22439519aea1dc90060bdf1c34cf SHA-256: af7627c0652e8cb421ae143031d524a6c724e5b760fc14bf40c8d30db91c5980
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of external links to various domains, a technique often used for SEO link farming or to distribute malicious content. The ML classifier strongly indicated maliciousness. The document body contains garbled text and embedded URLs, suggesting it is not intended for human consumption but rather as a lure to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kellysouthernwoodcrafts.com/uploads/1/3/0/6/130621656/130621656.html#co+pret%C3%A9rito+indicativo+de+comer
    • http://wildcat-wifi.com/uploads/1/3/0/5/130551586/6b346d7131e.pdf
    • http://thejeffreyamcleanfoundation.org/uploads/1/3/0/6/130604215/pakezuw-zamuxuzagerulan-rajijeripoguju.pdf
    • http://2illumeartstherapy.com/uploads/1/3/0/4/130483848/dufumejulodop-zotivir-pudas.pdf
    • http://autocarstuff.com/uploads/1/3/1/4/131410747/1645272.pdf
    • http://sitevents.net/uploads/1/3/1/3/131384227/jijufi_bobiz_senufifuje.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_off000053bc.bin
a0eb513f767fd3f66b0a7edb078326ad72333d4e55c2762df942191dc77d0c19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53BC 6784 bytes
font_01_sfnt_off00006c05.bin
d65752e558a9090157c9a1b02647c04d2680198cf9d52ff42939ef8ccbf7fabd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C05 16084 bytes

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