Malicious PDF — malware analysis report

Static analysis result for SHA-256 9539407d85d59da6…

MALICIOUS

PDF

43.2 KB Created: 2020-04-03 05:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e97151c6dab2ad0fecffd411e8d36afa SHA-1: a9fc14f5ebba37d87cde4fad3dccc0075c220e8d SHA-256: 9539407d85d59da6fc724ea1bb83ebcc647973f5a6ad1d499e552c25d3fee71f
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier strongly flagged this PDF as malicious. The embedded document body, though partially corrupted, contains URLs that are also listed in the extracted URLs, suggesting these links are the primary mechanism for delivering malicious content. 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://marikacleaningservice.com/uploads/1/3/0/6/130604498/130604498.html#dark+storm+christine+feehan+pdf
    • http://muffettakrueger.com/uploads/1/3/1/4/131411600/dezalajurudegawubizu.pdf
    • http://easycompmx.com/uploads/1/3/0/5/130588810/fozewubedepipaf.pdf
    • http://golflabel.dk/uploads/1/3/1/3/131382243/2900718.pdf
    • http://andersonsmasonry.biz/uploads/1/3/0/3/130313037/e1caca948eb7273.pdf
    • http://goodstickgoodstick.com/uploads/1/3/0/2/130289523/sefuzufuzokigi.pdf
    • http://cpanel.smithandcrumble.co.uk/uploads/1/3/0/6/130620217/c313df.pdf
    • http://allmetusa.com/uploads/1/3/0/4/130483592/nidopilokenuk_nozitaxukibo_dubar_lubuvis.pdf
    • http://dunedinrockchoir.org/uploads/1/3/1/3/131380850/9703068.pdf
    • http://shoepeddlers.com/uploads/1/3/0/5/130539428/461655.pdf
    • http://cfactorx.com/uploads/1/3/1/0/131070398/3458342.pdf
    • http://eyeconic-appointments.com/uploads/1/3/0/6/130603873/jelitinuzakulakikodo.pdf
    • http://bjonesowns.com/uploads/1/3/0/7/130775615/gezarobalofezibuke.pdf
    • http://freemarketvending.com/uploads/1/3/0/8/130813427/5df1d2e.pdf
    • http://themayacentre.org/uploads/1/3/0/4/130476632/kabopapozabuniwodel.pdf
    • http://donfranciscocigarstoo.com/uploads/1/3/0/6/130603860/cba6fa4c4e3.pdf
    • http://botoxalpharetta.com/uploads/1/3/0/6/130621646/tiliwedimojoliv.pdf
    • http://prettypushers.be/uploads/1/3/1/0/131070611/todosolejigomi_witugigo_lakapupowin_paxinuta.pdf
    • http://nikkistravellingblog.com/uploads/1/3/1/1/131164485/2120336.pdf
    • http://peterneofotis.com/uploads/1/3/0/5/130551704/661bd8a9e34a.pdf
    • http://albertatroutinc.com/uploads/1/3/0/2/130289610/4202361.pdf
    • http://kevinmeginley.com/uploads/1/3/0/7/130776605/46054c468f.pdf
    • http://translatica.lt/uploads/1/3/0/7/130775241/zatokeratewufubuf.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d9d.bin
57ccb099f9e4f74e4f7ea268f9201f510352640b8493f6c6410af79a1878d093		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D9D 8876 bytes

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