Malicious PDF — malware analysis report

Static analysis result for SHA-256 95fc9fafd904664c…

MALICIOUS

PDF

48.7 KB Created: 2020-03-30 02:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9b4b0b12221ca4df0608322ff0e24ab4 SHA-1: 7088cb46e63ee8614a6f1bc9a923e2e3cf09eaf8 SHA-256: 95fc9fafd904664ca6cbb56190518990f5804df83e3ed6f5d077e1e9df112dd0
92 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, as indicated by the PDF_SEO_LINK_FARM heuristic. The primary URL points to a page with "ejercicios de fracciones complejas resueltas", suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious. The numerous external links likely serve to distribute further malicious content or manipulate search engine rankings.

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://qualitycareafh.com/uploads/1/3/0/2/130287211/130287211.html#ejercicios+de+fracciones+complejas+resueltas
    • http://bluediamondfarms.com/uploads/1/3/0/8/130873937/9618278.pdf
    • http://livingthetype1life.com/uploads/1/3/0/5/130539554/joromojodu_rosule_bumegijuguvu.pdf
    • http://isabellasstyle.com/uploads/1/3/1/3/131383434/fasef_vawelupalov_genunubomudeba.pdf
    • http://thearauth.com/uploads/1/3/0/7/130775125/nitugu-wufefavabo.pdf
    • http://nedtheninja.com/uploads/1/3/0/6/130604657/4884017.pdf
    • http://featured-designs.com/uploads/1/3/0/6/130604495/9329748.pdf
    • http://arcspecialtycontracting.com/uploads/1/3/0/2/130292089/pimuzigarukusedu.pdf
    • http://baxtermagnusrios.com/uploads/1/3/1/0/131070216/78a54be7ec5fb.pdf
    • http://thatkidsbook.com/uploads/1/3/0/4/130483860/nezesidudivuzujad.pdf
    • http://pacificocentralazul.com/uploads/1/3/0/4/130489627/7032667.pdf
    • http://staceyjanedouglas.com/uploads/1/3/0/6/130620522/raluv.pdf
    • http://sassysistersboutique.shop/uploads/1/3/0/8/130814761/5803565.pdf
    • http://purposeinlife.info/uploads/1/3/0/9/130969825/563755cf28e1.pdf
    • http://nicollaslittleshop.com/uploads/1/3/0/2/130289227/gexekuz.pdf
    • http://flpumpandmeter.com/uploads/1/3/0/7/130775803/eab42.pdf
    • http://livingstonfamfarms.com/uploads/1/3/0/5/130543743/8067934.pdf
    • http://oiowearoficial.com/uploads/1/3/0/5/130551126/xezutimuki.pdf
    • http://emilydelbridge.com/uploads/1/3/0/7/130775827/tasusazipateme.pdf
    • http://dlparkerknives.com/uploads/1/3/0/4/130476104/duvez-sajoneje-gadogogupupo.pdf
    • http://greenefficienthvacservices.net/uploads/1/3/0/9/130969680/4339357.pdf
    • http://victoriawhitsonllc.com/uploads/1/3/0/8/130874509/zutakoxe-dakagovanuz.pdf
    • http://stoneflowerchicago.com/uploads/1/3/0/6/130621148/0880a8b664642c.pdf
    • http://hollomanafbcrashpad.com/uploads/1/3/0/6/130639055/17990c2db01d87.pdf
    • http://fisherrentalproperties.com/uploads/1/3/0/4/130435748/5597443.pdf
    • http://gcharlesdesignbuild.com/uploads/1/3/1/3/131383657/jesujeda-kejomisu-fixopitemaw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075dc.bin
79eab07a644bc817e1f1d80412019c44116698ff7b09b7d1d7927870fb348a0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75DC 8492 bytes
font_01_sfnt_off0000946c.bin
3ea007e2917ac1d47f11ca367169824efd9a74e1f99954041961e9b416aa2fd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x946C 2872 bytes
font_02_sfnt_off00009ea0.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EA0 16204 bytes

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