Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da9c32436bd5b5a…

MALICIOUS

PDF

37.1 KB Created: 2020-04-03 03:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6a9395bb776414a3d6b03e2a4f1a4920 SHA-1: 4cfd521d3bbbd5d09b3356136ecf25a3b78997a4 SHA-256: 9da9c32436bd5b5a7ce5a3b809fae93f2bd9dbb278d727ab85dc549ba1dd773c
62 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, many of which are structured as SEO spam. The document body, though partially obfuscated, contains text related to calculus examples and references the wkhtmltopdf tool, suggesting a lure to external content. The primary attack pattern observed is the creation of a link farm to drive traffic to potentially malicious or deceptive websites.

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://lauramhammett.com/uploads/1/3/1/0/131070356/131070356.html#axioma+del+supremo+calculo+diferencial+ejemplos
    • http://johnertler.com/uploads/1/3/1/0/131070043/8010976.pdf
    • http://vulcanconstructionco.com/uploads/1/3/0/5/130540304/7a5938.pdf
    • http://erratumenterprises.com/uploads/1/3/0/6/130604815/73e1239f7c.pdf
    • http://hyggeskilodge.com/uploads/1/3/0/6/130639861/safaf-nafibofe-wavas-kekada.pdf
    • http://grammiediaries.com/uploads/1/3/0/4/130488432/zexoxupopab.pdf
    • http://theanomalouskrafter.com/uploads/1/3/0/7/130740255/rezawotolisa_wogebitirix.pdf
    • http://hostmaster.swimbridgepreschool.com/uploads/1/3/0/6/130603928/5476903.pdf
    • http://boonefpc.org/uploads/1/3/1/4/131406708/eac2b708b5beb.pdf
    • http://twolandlockedmermaidsdesigns.com/uploads/1/3/0/4/130477346/f506bb5c0.pdf
    • http://westcoastretractablescreens.net/uploads/1/3/0/7/130775080/4872175.pdf
    • http://corano.org/uploads/1/3/0/3/130323599/falajokeku.pdf
    • http://norataboada.com/uploads/1/3/0/7/130739082/zebevat.pdf
    • http://largeandpage.com/uploads/1/3/1/4/131437069/8043603.pdf
    • http://facilitationgrandeurpropre.com/uploads/1/3/0/5/130588415/554338c84f4ffe7.pdf
    • http://exceleratesolutionsllc.com/uploads/1/3/0/6/130620819/06f7f3039f8bc.pdf
    • http://timberframing.ca/uploads/1/3/0/5/130540304/jamuvexif_surubokemal_lovuwid_vafumirijexiw.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_off000063b0.bin
1b42d1c665d476d59195913ac5294c7ffe33f1c495de22d9152b3b383776f1db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63B0 9332 bytes

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