Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d211451677f957…

MALICIOUS

PDF

48.7 KB Created: 2020-04-23 21:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ef2399ce51aa50e07ccda7a2ec64d3a5 SHA-1: 51ffa5457aac9692584283f5af0f2ab5cec7f01c SHA-256: 18d211451677f957d757111827629585196e01daa081d113e08ef3ee66e6a687
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which appear to be part of a link farm designed to distribute malicious content. The document body, though heavily obfuscated, contains a URL that matches one of the extracted links, suggesting a lure to a potentially malicious site. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 4

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://boxedandpotted.com/uploads/1/3/0/5/130589135/130589135.html#booster+pump+system+pdf
    • http://nikkikorthart.com/uploads/1/3/0/7/130740566/fb9f0.pdf
    • http://skiesoffire.us/uploads/1/3/0/7/130739583/bovaregezu.pdf
    • http://teledocllc.com/uploads/1/3/0/2/130270859/2365893.pdf
    • http://piegroupe.com/uploads/1/3/1/4/131437695/1494394.pdf
    • http://jthomrich.com/uploads/1/3/0/2/130289426/13b1ba.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000081af.bin
98ef81536bb03c2962913791f5216162a9e5cc5ad5f1a4280681484eda5d56df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81AF 8604 bytes
font_01_sfnt_off0000a27c.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA27C 16036 bytes

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