Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef05b5915cafdf4f…

MALICIOUS

PDF

35.6 KB Created: 2020-05-16 20:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a521c30cd5a64984e42e6d4ae61c55e9 SHA-1: 46d6c56684576c14feec63e837ea26244e5b2245 SHA-256: ef05b5915cafdf4f9511535c88c22809c201f000ffc5e3f6b7a6b28d5d4606fd
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, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains obfuscated text and URLs, suggesting an attempt to disguise the malicious intent. The primary goal appears to be directing users to a network of websites, likely for SEO spam or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://gritinmotionvt.com/uploads/1/3/0/5/130547969/130547969.html#album+admiravel+chip+novo+pitty
    • http://cheflexielogan.com/uploads/1/3/0/7/130739584/cf21af74be74f3e.pdf
    • http://caperecovery.com/uploads/1/3/1/4/131407047/xasategeseveve.pdf
    • http://siliconvalleyindustrialcenter.com/uploads/1/3/1/4/131483118/742d2898707cc.pdf
    • http://thebirthprofessor.com/uploads/1/3/0/6/130604448/pafaxeg-pejekepetoro-pabosudomenu.pdf
    • http://exclusivekicksoffresno.com/uploads/1/3/0/9/130968915/tetufitigu.pdf
    • http://beltparkwayny.com/uploads/1/3/0/5/130551323/xaluju-tavumatoluri-saritatebak-lutawu.pdf
    • http://stitchessewingstudio.net/uploads/1/3/0/7/130739256/4dd1e3213227.pdf
    • http://auroraharristoys.com/uploads/1/3/0/5/130589140/f2c7d1f73e5d9b6.pdf
    • http://sanmarcospestpros.com/uploads/1/3/0/4/130483163/252ebef1756ac3.pdf
    • http://unified-es.com/uploads/1/3/0/4/130483390/9963664.pdf
    • http://sandi4ward4.com/uploads/1/3/0/4/130488241/tabawepeg_fizaperesuk.pdf
    • http://thompsonfietsen.nl/uploads/1/3/1/0/131070196/nazukinasefu.pdf
    • http://reicheralsdiegeissens.org/uploads/1/3/0/5/130588168/bizexokudag-masegifo-ruvotirimuzevu.pdf
    • http://sellingwva.com/uploads/1/3/0/7/130776328/ed0395.pdf
    • http://blackcustomgolfcart.com/uploads/1/3/0/3/130323641/pawujuvo-tekasirefex-jazisanepona.pdf
    • http://billfeatherphoto.com/uploads/1/3/0/8/130813025/nakuniviseruxulimata.pdf
    • http://wholesomesn.com/uploads/1/3/0/5/130543813/6e672d869037.pdf
    • http://shanenvyhair.com/uploads/1/3/0/4/130483140/zibikoripaluv.pdf
    • http://michaelbicycles.com/uploads/1/3/0/5/130539881/7bee1.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_off00005d76.bin
745bbf7d9f126b867f9621c6616c493e5f684059d6b5aac57453d4554954e30d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D76 10824 bytes

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