Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a30549e216129f1…

MALICIOUS

PDF

64.9 KB Created: 2020-03-08 01:22:59 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 979e5cddefb4d49b5324b027ffe92500 SHA-1: 71e6c76dcf4d19e077e771377c0cb1fd1cd5c41d SHA-256: 8a30549e216129f18d3f749798b1c914fc37a44bbb0a1e4f15a8d034dae57975
92 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body contains garbled text but also includes the URL http://yinghuangguojiyulecheng.br3h.com/uploads/1/3/0/6/130621614/130621614.html#alt+number+code+smiley+face, which is also listed as an external URI. The ML classifier also flagged this PDF as malicious. The primary attack pattern appears to be a link farm designed to direct users to potentially malicious content hosted on numerous domains.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://yinghuangguojiyulecheng.br3h.com/uploads/1/3/0/6/130621614/130621614.html#alt+number+code+smiley+face
    • http://northernwoodlandindianart.com/uploads/1/3/0/8/130813618/242824d0.pdf
    • http://joangaeta.org/uploads/1/3/0/2/130288427/2493966.pdf
    • http://pathannafuels.com/uploads/1/3/0/8/130874563/17f92de8.pdf
    • http://tiffanyhairsalon.com/uploads/1/3/0/5/130545985/jasoxifurodaf-belawepuju-padedijuvuve.pdf
    • http://sweetwatermanors.com/uploads/1/3/0/5/130540928/bumujizefilinelo.pdf
    • http://www.viplimousinela.com/uploads/1/3/0/5/130589384/rifunejaloriti.pdf
    • http://angelbat.com/uploads/1/3/0/7/130739791/7279923.pdf
    • http://juliesmithtaylor.com/uploads/1/3/0/5/130542909/d2bedc.pdf
    • http://lokalimpact.org/uploads/1/3/0/4/130488322/gemaw.pdf
    • http://vita-world.org/uploads/1/3/0/6/130604111/popizinafop.pdf
    • http://lookgreatnakedatanyage.com/uploads/1/3/0/7/130776518/3163305.pdf
    • http://www.fixyourclassic.co.uk/uploads/1/3/0/2/130271063/850ead21a0f6.pdf
    • http://hostmaster.perranporthholidayretreats.co.uk/uploads/1/3/1/0/131070527/7003881.pdf
    • http://cpanel.wremac.com/uploads/1/3/0/7/130739509/6835823.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_off00007458.bin
07a0ac1beb6d59c9d8ea1172a76669c3ba57441bdc512289dbc84896af0999f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7458 24276 bytes
font_01_sfnt_off0000b704.bin
515b886fad8ac53b965861717cbe47afdd5f0c5a9c5333b93dc5dd3da93f2ffc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB704 6764 bytes
font_02_sfnt_off0000cbab.bin
bff06540de6a5b4f5c41c0b47f2a878f0ab6b09ab5e7e8e5b0c6ac9a016bb2a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAB 4700 bytes
font_03_sfnt_off0000da81.bin
671461d3a8ddd32880220526414c1433460d5bc7cf990cc0d52ebcee009ec11f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA81 17216 bytes

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