Malicious PDF — malware analysis report

Static analysis result for SHA-256 64e27b9dd3a69918…

MALICIOUS

PDF

46.3 KB Created: 2020-03-29 09:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c3987d519f64b5d69158ef97fe7de348 SHA-1: a436e8f394e988cf9c24fb8b2ca840fd282ba7c0 SHA-256: 64e27b9dd3a69918a9647f59e091c9fb63081b95a421180cb9f1f2d04beadca1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, disguised as a helpful guide for using Microsoft Word. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports malicious intent. No scripts were extracted from this sample.

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://bodyworkbybarb.com/uploads/1/3/0/4/130489185/130489185.html#como+hacer+lineas+verticales+y+horizontales+en+word+2010
    • http://propixlab.com/uploads/1/3/0/8/130814247/a044abf3f.pdf
    • http://jennifersharpe.com/uploads/1/3/1/1/131164021/nimisajogigit.pdf
    • http://cscle.com/uploads/1/3/0/8/130813851/gojezob.pdf
    • http://djtrukka.com/uploads/1/3/0/5/130590169/8750893.pdf
    • http://www.finanz-reparaturservice.com/uploads/1/3/0/6/130604344/6071872.pdf
    • http://eaoldmixon.com/uploads/1/3/0/4/130436154/8151071.pdf
    • http://easdmobishare.com/uploads/1/3/0/7/130775434/ritegosunowivu_foxusowonano_texitegipunuxaz.pdf
    • http://youandmeand.us/uploads/1/3/0/6/130604250/ninediruj.pdf
    • http://emersoncurtisbradford.com/uploads/1/3/0/2/130273791/5823128.pdf
    • http://ferrepaz.com/uploads/1/3/0/8/130815140/jisak.pdf
    • http://themeshmaster.com/uploads/1/3/0/5/130551765/nexufitufisoli.pdf
    • http://www.lmhtherapies.co.uk/uploads/1/3/0/6/130605302/mozepejopotum.pdf
    • http://lotifun.com/uploads/1/3/0/9/130969000/76e4d339c98f0.pdf
    • http://missionexcell.com/uploads/1/3/0/5/130539697/3672158.pdf
    • http://luckydogsofmilford.com/uploads/1/3/0/6/130604778/zasepanipinil.pdf
    • http://74-123-77-20.mgwnet.com/uploads/1/3/1/1/131164054/xalomoleni.pdf
    • http://rakennuslehtisalo.fi/uploads/1/3/0/6/130640074/cdf2c.pdf
    • http://www.theartofbelovingness.com/uploads/1/3/1/0/131070845/maxed_zoxiza_kijumidu_momodewu.pdf
    • http://www.yotainme.com/uploads/1/3/0/8/130874023/xaxap-vugawunugim-resawagug.pdf
    • http://chialphapsiucla.org/uploads/1/3/0/5/130539518/9893393.pdf
    • http://kcdermodywriter.com/uploads/1/3/0/6/130621022/badofuv.pdf
    • http://myerstownboyscouts.com/uploads/1/3/0/2/130273993/b6dc34c90.pdf
    • http://stantonstjohnopera.org/uploads/1/3/0/8/130874252/fodelinuwog.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007352.bin
de7cfc98e0cb57f3ed595fbf12920c7e995336bc471b51b53fda33516b1db4f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7352 8824 bytes
font_01_sfnt_off000093a2.bin
57b11507310a54ac1804785031a6c50e3b77163964f97d9b63d647909f1b8434		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93A2 16088 bytes

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