Malicious PDF — malware analysis report

Static analysis result for SHA-256 61265ae2d893041d…

MALICIOUS

PDF

40.2 KB Created: 2020-06-05 05:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4ec5eaa7805cb8b103b4c91a1cf2059 SHA-1: 9400eea9fd41c4b9c43126f46eb16ce9f78b369a SHA-256: 61265ae2d893041da921ba316c3b73e29d89929fddf690c4799212c1f4181f17
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains text related to anatomy drawings and the authoring application, but the primary malicious activity appears to be the mass linking to external sites, likely for SEO manipulation or to redirect users to malicious content.

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://michaelwellsart.com/uploads/1/3/1/6/131607232/131607232.html#anatomy+of+human+body+drawing+pdf
    • http://lawmemphis.com/uploads/1/3/1/6/131637714/maxirotumejux.pdf
    • http://aimmos.org/uploads/1/3/0/2/130287957/mojul.pdf
    • http://mail.gvgent.be/uploads/1/3/0/6/130603731/185248.pdf
    • http://magicalmysterybiketours.com/uploads/1/3/0/2/130289460/basekomerabogu.pdf
    • http://j1.westside-church.com/uploads/1/3/0/6/130639278/c6ada9.pdf
    • http://de.mentaleclipsetheater.com/uploads/1/3/0/4/130435573/muwoluwasina.pdf
    • http://genesiseve.org/uploads/1/3/1/0/131070112/sased-mapeji-turuxorepofuxog.pdf
    • http://stevejamesconsulting.com/uploads/1/3/0/7/130775205/toxiborasenujugan.pdf
    • http://alfalfe.com/uploads/1/3/0/5/130542982/bowanom-bekidanesabite-ketegokeko.pdf
    • http://mail.funkytownculture.com/uploads/1/3/1/6/131606367/mupakaviseponogonif.pdf
    • http://cpcalendars.abogadafiera.com/uploads/1/3/0/6/130620899/pevoxolasofi_pekili_relumufexim.pdf
    • http://michaelwellsart.com/uploads/1/3/1/6/131607232/terms.html
    • http://michaelwellsart.com/uploads/1/3/1/6/131607232/dmca.html
    • http://michaelwellsart.com/uploads/1/3/1/6/131607232/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://kubuvepex.files.wordpress.com/2020/06/kulobedufevukajided.pdf
    • https://xedubewod.files.wordpress.com/2020/06/jarikizavugudifusetitegi.pdf
    • https://wupojawafosa.files.wordpress.com/2020/06/85030195701.pdf
    • https://nizijosawok.files.wordpress.com/2020/06/nijug.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://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070f6.bin
d2f740c8036d288f53bdede6dd27512b01a66f41773ee2345461ab88d786a551
pdf-font-stream PDF embedded font (sfnt) at offset 0x70F6 10484 bytes