Malicious PDF — malware analysis report

Static analysis result for SHA-256 29c59bed56cda351…

MALICIOUS

PDF

53.8 KB Created: 2020-03-27 13:23:45 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b293b399c6e5341d557b781000eb6db8 SHA-1: 675b553a9c6b85cb98de8b3f0ae00efa8f66ed04 SHA-256: 29c59bed56cda3510180924234588ad0694fa4a161ba86e4d0aae165ac5bf8bb
92 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam or directing users to malicious sites. The document body, though partially corrupted, suggests educational content ('Ejercicios de multiplicacion y division de numeros irracionales') which is likely a lure. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms a large number of external links, many with numeric slugs, pointing to a link farm or similar SEO manipulation technique.

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://topnotchbling.com/uploads/1/3/0/6/130640132/130640132.html#ejercicios+de+multiplicacion+y+division+de+numeros+irracionales
    • http://vikkiwinks.com/uploads/1/3/0/6/130621487/dasewul.pdf
    • http://spi-cibernetica.com/uploads/1/3/0/2/130288532/panitawuzosanawuv.pdf
    • http://amiconnections.com/uploads/1/3/0/5/130588554/jomaxilesif.pdf
    • http://newlifefitz.org/uploads/1/3/0/5/130550664/3686467.pdf
    • http://weefca.com/uploads/1/3/0/2/130271067/301241d16.pdf
    • http://worldciderdomination.com/uploads/1/3/0/7/130739197/vagopavurijo.pdf
    • http://www.duckyjonesglasscompany.com/uploads/1/3/0/9/130969997/8725473.pdf
    • http://moldzeroca.com/uploads/1/3/0/5/130543537/378421.pdf
    • http://mail.sohosammy.com/uploads/1/3/0/5/130551090/12a08.pdf
    • http://www.mummydoctorlife.com/uploads/1/3/0/5/130551728/buruwojuturog-liminaz-latagurefibo.pdf
    • http://albertonorchids.com/uploads/1/3/0/6/130604151/lupime_lasavugurewug.pdf
    • http://affordablevisualconcepts.com/uploads/1/3/0/6/130604804/5482d3089.pdf
    • http://bethckincaidmedncclpcpllc.com/uploads/1/3/0/5/130551697/7d95085.pdf
    • http://7tuckerstreet.com/uploads/1/3/0/5/130590325/xajote.pdf
    • http://alendinghandseniorliving.net/uploads/1/3/0/2/130289418/9555115.pdf
    • http://www.perendies.com/uploads/1/3/0/3/130323390/5efa347f36.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_off0000a159.bin
2f30e2f00ae78084bc929a6f7379922cd4bd51441a4720ab1e558b4333d19399		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA159 10604 bytes

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