Malicious PDF — malware analysis report

Static analysis result for SHA-256 575d30069d3d2234…

MALICIOUS

PDF

52.1 KB Created: 2020-04-07 07:39:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0295576ffa83ebe37ccf753dd395d42b SHA-1: ad89291a3c9ceceb5bc2379b600fb24b9a24fe73 SHA-256: 575d30069d3d223437d17a089c613f999626d76db988b18971e9a7bd1c0ca1a3
92 Risk Score

Malware Insights

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

The PDF contains a significant number of external links to other PDF files hosted on various domains, indicative of a link farm. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern observed is the creation of a link farm, likely to manipulate search engine results or to serve as a distribution point for further malicious content. The embedded URLs are the highest priority IOCs.

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://newtrendresidential.net/uploads/1/3/0/7/130775291/130775291.html#the+unwanted+undead+adventurer+rent
    • http://aranyahtara.com/uploads/1/3/0/4/130489417/6c9869.pdf
    • http://risingfall.org/uploads/1/3/0/5/130544226/butezudimef-mujelopagad-zovubatuwed-xudimeba.pdf
    • http://paulfolger.net/uploads/1/3/0/8/130873864/jirunelajolaxomu.pdf
    • http://arkansaspropertymaintenance.com/uploads/1/3/0/9/130968995/dikasofiko_japom_gadevaki_dubinilobotuxa.pdf
    • http://dmbau.org/uploads/1/3/0/5/130588545/e5fbbc908c.pdf
    • http://celisette.net/uploads/1/3/0/8/130874672/4ccf38.pdf
    • http://fischermaquinas.com/uploads/1/3/0/6/130620949/serijigiwinidoxi.pdf
    • http://bostonhomehost.com/uploads/1/3/0/6/130604072/c571e.pdf
    • http://colvigconsulting.com/uploads/1/3/0/6/130639244/15d1eb21.pdf
    • http://millennialstitcher.com/uploads/1/3/1/4/131407117/depapodesapalenugo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007217.bin
676e1fd99f30b9f88cb66c981c260d292dfe96268b41532598c88f514945e170		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7217 7940 bytes
font_01_sfnt_off0000910b.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x910B 2652 bytes
font_02_sfnt_off00009a48.bin
4b351ca503c639ca43d4450c4df634fb367ee8b40680984d64e49785723ede05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A48 5596 bytes
font_03_sfnt_off0000ac5e.bin
dd379b1d3cb03f93dba54194da025dede710ba3848cc012a0ba552b48b64a3da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC5E 16456 bytes

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