Malicious PDF — malware analysis report

Static analysis result for SHA-256 5175973ceb065b12…

MALICIOUS

PDF

42.3 KB Created: 2020-03-14 12:42:56 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: aaa79c1ba9ac749b82205fcc7ff3779c SHA-1: 0c66659f9b1b158a2cba3b932438188dca4abd37 SHA-256: 5175973ceb065b122129d3bca2051e1aa2dbac94f9f19cce27efc092e34161bf
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on various domains. The document body text, though partially corrupted, includes references to 'Invitation card template psd' and the wkhtmltopdf application, suggesting a lure. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host malicious content. The ML classifier strongly flags this PDF as malicious.

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://sattler-wedding.rominastiebenphotography.com/uploads/1/3/0/8/130813132/130813132.html#invitation+card+template+psd
    • http://74-123-72-78.mgwnet.com/uploads/1/3/0/5/130590555/nirumoboti.pdf
    • http://www.birdst.org/uploads/1/3/0/5/130588633/cead491643cfb8c.pdf
    • http://l-arginine-supplement.com/uploads/1/3/0/4/130483625/rokobizivize-dadom.pdf
    • http://minnesotakindnessproject.org/uploads/1/3/0/5/130590410/864760.pdf
    • http://voteshane.com/uploads/1/3/0/2/130271214/gomawekuterukedemesa.pdf
    • http://matras.express/uploads/1/3/0/5/130544703/7dd7e.pdf
    • http://lightningreleasesnotifications.com/uploads/1/3/0/7/130739910/2545881.pdf
    • http://netherplay.org/uploads/1/3/0/6/130604258/majilasomusimu.pdf
    • http://calvaryslofamilies.com/uploads/1/3/0/7/130776385/visukotozezeg.pdf
    • http://www.divine-law.com/uploads/1/3/0/5/130589252/025c4eb372.pdf
    • http://www.swissluxuries.com/uploads/1/3/0/6/130603721/7187243.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_off00007c14.bin
1e26c6311885d36ac2c87285e701e9b28d7b5b9568981dcd7550aa40ece290e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C14 7904 bytes

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