Malicious PDF — malware analysis report

Static analysis result for SHA-256 998634a2c39bc7e2…

MALICIOUS

PDF

36.1 KB Created: 2020-04-04 14:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a14209731d19a15f0e86e7cd7c6e9edf SHA-1: 9bccbed09b648152633d3a06fb807b9cb55da768 SHA-256: 998634a2c39bc7e2bbe4ff9b0606bc9770d2e4de6b3541689f2f142519a1b204
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm, often used to manipulate search engine results or to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, limiting the analysis of direct payload execution.

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://jkjlawnsprinkler.com/uploads/1/3/0/7/130775320/130775320.html#nitrito+de+aluminio+peso+molecular
    • http://adrasteiablaise.com/uploads/1/3/0/6/130621890/9255763.pdf
    • http://wedesignonline.org/uploads/1/3/0/5/130588723/3723147.pdf
    • http://delaneydanielphotography.com/uploads/1/3/0/5/130588349/8925284.pdf
    • http://suefordedtechportfolio.com/uploads/1/3/0/6/130620356/f5b9a09f91a.pdf
    • http://willardpeakorganics.com/uploads/1/3/0/8/130813413/gamalow.pdf
    • http://cobbchaptertwo.com/uploads/1/3/1/3/131398478/getokuv.pdf
    • http://theparisflaneur.com/uploads/1/3/0/7/130776460/9843973.pdf
    • http://keratinmyhair.com/uploads/1/3/0/5/130545827/vapogilaxunubunaz.pdf
    • http://azamericansaddlebredfoundation.org/uploads/1/3/0/4/130478205/1800604.pdf
    • http://tiffanywhiterealestate.com/uploads/1/3/1/4/131407036/pitotoxesukomazil.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_off0000630f.bin
2a2f0b41404aed6cd7cc704de0f4fe3de6bd68d0c58a6836db776c858673df95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x630F 8540 bytes

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