Malicious PDF — malware analysis report

Static analysis result for SHA-256 5804ba7f8734e276…

MALICIOUS

PDF

53.3 KB Created: 2020-04-13 13:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b0b30a8157a2109135a099ac15d7781a SHA-1: 67ba97dedeaaf84c7a85324b4295408613ce17cd SHA-256: 5804ba7f8734e276f820602d20c51c3b3f1cd70ab212e80553a995d93a81b973
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files on various domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The document body, though partially obfuscated, contains text related to 'Curriculum oculto de jackson' and the wkhtmltopdf generator, suggesting a lure to potentially malicious content hosted on the numerous extracted URLs.

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://headblocks.org/uploads/1/3/0/5/130590613/130590613.html#curriculum+oculto+de+jackson
    • http://gemscheerwoodstock.com/uploads/1/3/0/8/130874201/3515819.pdf
    • http://littlelearner.org/uploads/1/3/1/4/131453592/625d56.pdf
    • http://xpatographer.com/uploads/1/3/0/9/130969648/nuvebasapurixusivev.pdf
    • http://personalcareofsumter.com/uploads/1/3/0/9/130969960/dijefokikin.pdf
    • http://seniorlivingnavigator.net/uploads/1/3/1/3/131378972/b00257b7b.pdf
    • http://tandvarkeriet.se/uploads/1/3/1/3/131380836/878ef97533199.pdf
    • http://excelsiorcs.com/uploads/1/3/1/4/131437622/limigexodewud.pdf
    • http://arrowristoranteitaliao.com/uploads/1/3/0/7/130775282/1723078.pdf
    • http://jarettmcalistermusic.com/uploads/1/3/0/4/130488469/8239834.pdf
    • http://ctactile.com/uploads/1/3/0/2/130287239/326079.pdf
    • http://meltencinitas.com/uploads/1/3/0/7/130738578/55435d4b71.pdf
    • http://lokada.lt/uploads/1/3/0/3/130313383/wipusodetepax.pdf
    • http://fuzzymoon.net/uploads/1/3/1/3/131379478/zeseko_sebefufaridu_jozopi_jofajivovas.pdf
    • http://theluxycloset.online/uploads/1/3/1/0/131070230/37c23887f0.pdf
    • http://michaelsesko.com/uploads/1/3/0/7/130775830/e0f5e23d8d33.pdf
    • http://arrowristoranteitaliao.com/uploads/1/3/0/7/1307
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008742.bin
6db2b1ff47e2bdf44575b0c3d0fe3e26accb3798a0386165a97391370c34dbff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8742 9168 bytes
font_01_sfnt_off0000a89d.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA89D 2652 bytes
font_02_sfnt_off0000b203.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB203 16036 bytes

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