Malicious PDF — malware analysis report

Static analysis result for SHA-256 672105ada5441e6d…

MALICIOUS

PDF

41.1 KB Created: 2020-04-04 11:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b1d0f04936df9df36ea4ce26d91627ed SHA-1: 90352f048d8e02b0284b99dbcb80e8b54122ccb2 SHA-256: 672105ada5441e6d0ae4215918f70b9960b2c33466c50da407fd3974085ae705
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external PDF and HTML files, indicative of a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious, and the presence of many external links suggests an attempt to redirect users to potentially harmful content or phishing sites. No scripts were extracted, but the document body contains obfuscated text and URLs.

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://uniquelifesolutions.net/uploads/1/3/0/3/130323250/130323250.html#operaciones+con+n%C3%BAmeros+racionales+suma+resta+multiplicaci%C3%B3n+y+divisi%C3%B3n
    • http://belugacapital.co/uploads/1/3/0/2/130289354/2330919.pdf
    • http://mta-sts.amberhansen.com/uploads/1/3/0/5/130589331/fuxurudelomuv.pdf
    • http://lagniappewithahook.com/uploads/1/3/0/2/130272629/jabubenutimojofufat.pdf
    • http://starsforabettertomorrow.org/uploads/1/3/0/7/130738501/6500135.pdf
    • http://nbvaea.org/uploads/1/3/0/3/130323232/180907.pdf
    • http://wanderlustneverdies.com/uploads/1/3/1/3/131383629/gisuzuduvejazot.pdf
    • http://urbanforestoperations.com/uploads/1/3/0/9/130969706/374a536bf6c5b.pdf
    • http://barnyardbidders.com/uploads/1/3/0/2/130288320/4212764.pdf
    • http://sjcfol.org/uploads/1/3/0/5/130588278/7741787.pdf
    • http://hummingbeings.com/uploads/1/3/0/6/130604039/ebf7851a5a174.pdf
    • http://urbanrusticchicago.com/uploads/1/3/0/6/130639764/botobi.pdf
    • http://jandbfit.com/uploads/1/3/0/7/130775834/jerirowugis-wodetid.pdf
    • http://kylebibby.com/uploads/1/3/0/2/130289618/3003103.pdf
    • http://uniquehomesearch.com/uploads/1/3/0/6/130639246/beca1f920cedf.pdf
    • http://sandersonfarmsne.com/uploads/1/3/0/9/130968917/7024289.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • https://youtu.be/3m_5f
    • 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_off000070a5.bin
fd097be2f5de91b7cbf3eb2b15b0c96b525de8638df3a232ce793203f320eb46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70A5 9768 bytes

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