Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb7b0071761cd96…

MALICIOUS

PDF

35.0 KB Created: 2020-04-06 12:40:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: af4a6f4a6a05e79c7715a2bc844b5abe SHA-1: cc48c377c9c0619322bcf0d635777553f80c6247 SHA-256: 4cb7b0071761cd96ea65be4391dc769ee3f809f6f9bb0d92aecc938d742e688c
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF documents hosted on various domains, indicative of a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious. The document body text, though partially corrupted, contains the phrase 'Ciclo del fosforo facil de dibujar' and references wkhtmltopdf, suggesting it may be part of a content generation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://phantomautodetailing.net/uploads/1/3/0/6/130621218/130621218.html#ciclo+del+fosforo+facil+de+dibujar
    • http://threeoms.com/uploads/1/3/1/4/131453837/3042192.pdf
    • http://projectebb.com/uploads/1/3/0/7/130739793/2631569.pdf
    • http://leeyas.com/uploads/1/3/0/3/130323097/1687832.pdf
    • http://southbayluaus.com/uploads/1/3/0/6/130604687/4eb3e228c120f8d.pdf
    • http://mtpersonaltraining.fi/uploads/1/3/0/7/130739392/3414377.pdf
    • http://ilenegillispie.com/uploads/1/3/0/5/130589243/bojuwo.pdf
    • http://nationwestdesign.com/uploads/1/3/1/1/131163740/gademavavoju.pdf
    • http://5280executivemanagement.com/uploads/1/3/0/6/130604363/cd90c6e4d.pdf
    • http://tallyscare.com/uploads/1/3/0/5/130589386/boxeposaragojuwono.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_off000060b0.bin
4b6324f17ef23f08ffd968cbaf716380bf78f27f698a3b999dc97dc6b8256f37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60B0 7836 bytes

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