Malicious PDF — malware analysis report

Static analysis result for SHA-256 a56d0efc53b67d2c…

MALICIOUS

PDF

57.1 KB Created: 2020-03-24 12:49:33 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 01084c2de6f60ee011e7de93f23d63e7 SHA-1: 4b47e8f246b1219a3b9efa3b8b761c72f91fc98f SHA-256: a56d0efc53b67d2c66a1dc3d67b6f8685ca911bdf1b7d2ebba5e6e7d5833a5d4
92 Risk Score

Malware Insights

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

The PDF contains a mass of external links to other PDF files hosted on numerous domains, a technique often used for SEO spam or to distribute malware. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the sheer volume of outbound links suggests a malicious intent to redirect the user to potentially harmful content.

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://alexandra-brokowski.com/uploads/1/3/0/7/130775610/130775610.html#enthalpy+of+solution+calculations
    • http://host14.carmichaelnl.com/uploads/1/3/0/6/130639669/lebaxajikiru-nusaguxololo.pdf
    • http://feriadelmecanico.com/uploads/1/3/0/7/130776141/mosajamefujifeb.pdf
    • http://csgtennisclub.co.uk/uploads/1/3/0/6/130639212/8098447.pdf
    • http://reshafe.fr/uploads/1/3/0/5/130589276/476dab71b9a8.pdf
    • http://curaty.co.uk/uploads/1/3/0/4/130476601/denogidixixukev.pdf
    • http://photographamerica.net/uploads/1/3/0/7/130738673/4a860734.pdf
    • http://mytexaswildlife.org/uploads/1/3/0/2/130271083/lavutarodateroj-nonitavugu-muxotuwemub-wuvamaxewaseza.pdf
    • http://d93bond.com/uploads/1/3/0/4/130477613/1066195.pdf
    • http://refinishedcabinets.com/uploads/1/3/0/6/130605216/faguzevub.pdf
    • http://robertvandongenphotography.com/uploads/1/3/0/6/130621105/bonaxonigure-rusizu-xojebepovatobi-xirozazegev.pdf
    • http://ns.thealliancetheatre.org/uploads/1/3/0/2/130272478/1664577.pdf
    • http://oliverdruencarpentry.com/uploads/1/3/1/0/131070226/9685059.pdf
    • http://crc2016.com/uploads/1/3/0/6/130639471/sarobotobik-favus-gomuwizajabafur-karesisigez.pdf
    • http://nqdrilling.com/uploads/1/3/0/9/130969923/dadijeket-piwilul-piwikidi.pdf
    • http://webmail.kardholder.com/uploads/1/3/0/6/130620800/pabinuvatibak_kefiwolamepa_sotawezimobagu.pdf
    • http://rvtrailertires.net/uploads/1/3/0/5/130551237/pegubupiso.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a9ca.bin
e3b167a6e7f662a735d8852299c84c987527e91d591ed56aaa19363f70e7ccb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9CA 8496 bytes
font_01_sfnt_off0000caa9.bin
b637cd75bc7e4ae3c8d0381181f9871d46d2319c2b28a686e2fe2ababfc94389		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA9 3388 bytes

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