Malicious PDF — malware analysis report

Static analysis result for SHA-256 46088c417a4a887a…

MALICIOUS

PDF

48.7 KB Created: 2020-03-21 13:24:27 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0ac4f0f72cad01337ef35dbf67da0c3d SHA-1: ae43a1efd85438bf2c5eeefe82ef518d3951b91b SHA-256: 46088c417a4a887a50ba1f04407d710a6be200f53a01bd486d5055d00880e472
94 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, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or SEO spam operation. The ML classifier also strongly indicated maliciousness. The document body contains garbled text along with some of the URLs, further supporting the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://floralfaeriedesigns.com/uploads/1/3/0/2/130272394/130272394.html#enfoque+cuantitativo+pdf
    • http://cassiecares.org/uploads/1/3/0/5/130590673/0b55044a73d2bb3.pdf
    • http://jenbertoni.com/uploads/1/3/0/8/130874347/eac3f28bfc5d534.pdf
    • http://jenniferusaunders.com/uploads/1/3/0/5/130551477/7344369.pdf
    • http://www.kingstoncollegeinternational.com/uploads/1/3/0/6/130621643/3887095.pdf
    • http://fortnerpiano.com/uploads/1/3/0/5/130588834/20f228.pdf
    • http://www.akikomueller.com/uploads/1/3/0/7/130739146/1346753.pdf
    • http://whitespacemarketing.org/uploads/1/3/0/5/130588685/004f42f84d.pdf
    • http://www.carpetssupplieddirect.co.uk/uploads/1/3/0/7/130738484/6998375.pdf
    • http://www.fourthgrademathcamp.com/uploads/1/3/0/7/130775023/6089779.pdf
    • http://alilogisticsglobal.com/uploads/1/3/0/4/130483736/wuwodunaxipejupo.pdf
    • http://www.le-manuel-des-entretiens-de-motivation.fr/uploads/1/3/0/8/130874633/f79bf.pdf
    • http://freshlypict.com/uploads/1/3/0/7/130775013/55c6eb38.pdf
    • http://vnannj.com/uploads/1/3/0/5/130589396/4503667.pdf
    • http://shanebrelesky.com/uploads/1/3/0/3/130323697/mimizeva_xazirawozoderid_fulizape_xefemov.pdf
    • http://saromas.com/uploads/1/3/0/6/130604812/9236450.pdf
    • http://www.katherinefotos.com/uploads/1/3/0/4/130483276/75d47bd03c70.pdf
    • http://ncwrestlingreport.com/uploads/1/3/0/7/130739173/razudi.pdf
    • http://naturalroofingslate.net/uploads/1/3/0/4/130436145/folitaguzejakalutum.pdf
    • http://morwennabrady.com/uploads/1/3/0/5/130538986/xeres.pdf
    • http://mail.tmdtc.org/uploads/1/3/0/9/130969149/gugamiketopozo-fikuvakon-tizamazevux-tisuvaten.pdf
    • http://windycitytax.biz/uploads/1/3/0/6/130621983/82436ba2.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_off0000942b.bin
5dc1a779ce79a81b3b3236d9a98ae685063d7a92243e6266982ce09c891af24b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x942B 8920 bytes

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