Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37b7e69812f1cb2…

MALICIOUS

PDF

33.4 KB Created: 2020-06-01 10:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1281890726b90585425407e172fe4e3 SHA-1: 704a50a29b2c878833f09fcfa4ea83999298d094 SHA-256: d37b7e69812f1cb2596c3c6c0df33754dc1821c904f259a5dc7632d781125f87
92 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to similarly structured URLs on different domains. This indicates a link farm or SEO poisoning tactic, likely intended to drive traffic or host further malicious content. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted from this sample.

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://baijialechanglongdafa.br3h.com/uploads/1/3/0/4/130435659/130435659.html#worksheets+days+of+the+week+pdf
    • http://belmarbookcon.com/uploads/1/3/0/5/130588344/sarodepane.pdf
    • http://hellomamayoga.com/uploads/1/3/0/4/130476076/d8da10c.pdf
    • http://t-tahiti.com/uploads/1/3/0/8/130874397/34345de1fd321.pdf
    • http://sdfishandsips.com/uploads/1/3/0/7/130775851/virugofitef.pdf
    • http://completebydesigncbd.net/uploads/1/3/0/6/130604864/82003f4a95372c.pdf
    • http://internationalhouseoffairies.com/uploads/1/3/0/3/130323755/bb1760f0992.pdf
    • http://phoenixvillesteam.org/uploads/1/3/1/4/131437535/994fba08890c.pdf
    • http://4o3.undesirable.us/uploads/1/3/0/7/130776854/1129100.pdf
    • https://suxeniruwip.files.wordpress.com/2020/05/paguxokajinexasepakeb.pdf
    • https://dopiximodo.files.wordpress.com/2020/05/79294872021.pdf
    • https://witinubaxa.files.wordpress.com/2020/05/powasojeki.pdf
    • https://kajunomifoj.files.wordpress.com/2020/05/57518123909.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_off0000578a.bin
ac66d2e06ba2aaed538a3888c01c73a428ead6bd79131f6a833756fcb4fb0d64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x578A 10240 bytes

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