Malicious PDF — malware analysis report

Static analysis result for SHA-256 27292116ea65f437…

MALICIOUS

PDF

44.3 KB Created: 2020-03-08 09:59:20 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2021-10-11
MD5: 7cb4c8763efa3fc02af8d186a20c2fbe SHA-1: c0b9f176301c91ae34b5485c137b169ca4c93f61 SHA-256: 27292116ea65f437e46d0d214b20d37f9a1daab9a289cbe45a5ae3ce135a1ae8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which point to PDF files with numeric slugs, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs indicates a potential attempt to redirect users to malicious content or exploit them through a link farm. 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://samali2017-v3.devsite-1.com/uploads/1/3/0/3/130324044/130324044.html#how+to+change+input+font+size+in+html PDF link annotation
    • http://morganrv.com/uploads/1/3/0/7/130775135/jevofedumevoz-vijuwakesitado.pdfIn PDF document text
    • http://rockofoakland.com/uploads/1/3/0/6/130604780/vojupurozi.pdfIn PDF document text
    • http://www.mybaby3d.com.au/uploads/1/3/0/2/130289291/6130575.pdfIn PDF document text
    • http://opticagency.com/uploads/1/3/0/6/130621958/pimejupimadiw.pdfIn PDF document text
    • http://cpanel.kwintl.com/uploads/1/3/0/3/130323968/jidij.pdfIn PDF document text
    • http://cayleymanorhomeownersassociation.com/uploads/1/3/0/4/130435694/farusi.pdfIn PDF document text
    • http://www.acrylicskeleton.com/uploads/1/3/0/4/130476091/2628330.pdfIn PDF document text
    • http://project-27.net/uploads/1/3/0/2/130272932/dokowaxam_kozoravan.pdfIn PDF document text
    • http://peposa.net/uploads/1/3/0/6/130620776/3941669.pdfIn PDF document text
    • http://www.frvinc.net/uploads/1/3/0/4/130477346/sipojuninep.pdfIn PDF document text
    • http://mail.trevorromain.com/uploads/1/3/0/5/130551543/lopubajedebapetov.pdfIn PDF document text
    • http://www.everyoneislocal.com/uploads/1/3/0/5/130539125/3353956.pdfIn PDF document text
    • http://betsybabs.com/uploads/1/3/0/4/130483748/dixujuji.pdfIn PDF document text
    • http://soniaorphansociety.com/uploads/1/3/0/5/130590177/b95af6.pdfIn PDF document text
    • http://mail.signorimanisalonandspa.com/uploads/1/3/0/2/130288348/wisuga.pdfIn PDF document text
    • http://thenegoti8ors.com/uploads/1/3/0/2/130271015/b1871ecea934.pdfIn PDF document text
    • http://1800ilisten.com/uploads/1/3/0/7/130775516/vijupinadolepojiva.pdfIn PDF document text
    • http://bangkokkettlebells.com/uploads/1/3/0/7/130739174/ce65f47.pdfIn PDF document text
    • http://www.glitzpageantrentals.com/uploads/1/3/0/5/130540874/4253712.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F01 8332 bytes
SHA-256: 0e58f05fc9f887d583ec1f0230d360c736dba8c81b139b4932aa2503a4a36d6c
font_01_sfnt_off00008f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F23 16076 bytes
SHA-256: 0c8b636322dcb4d69dd08a763b09c4b5ff2b7ea73056f43add13012560a79e6e

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