Malicious PDF — malware analysis report

Static analysis result for SHA-256 73528848e182d0f3…

MALICIOUS

PDF

45.2 KB Created: 2020-03-27 08:41:40 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9f9f15e29bf4bbe862a0ed8a37d7fe4b SHA-1: 98bafe1da630e7a2362f799aa4be0b32d8349710 SHA-256: 73528848e182d0f3bba4a3475eae264f7bf8286ebb46397070ed3982bf1128a4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or a mechanism to distribute malicious content across numerous sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body is largely unreadable binary data with some embedded 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://benkregel.com/uploads/1/3/1/3/131381555/131381555.html#tecnologia+de+las+maquinas+y+herramientas+pdf
    • http://minisportsclub.ch/uploads/1/3/0/3/130313203/fuxab.pdf
    • http://ronsokolbooks.com/uploads/1/3/0/2/130287529/158696.pdf
    • http://alphamotors.com.br/uploads/1/3/0/2/130287919/raporekovukasikanige.pdf
    • http://www.susanlawton.susan-zises.com/uploads/1/3/0/6/130620573/xagebilawivipixel.pdf
    • http://events.45-degres.ca/uploads/1/3/0/7/130776428/811f167e.pdf
    • http://mta-sts.amscied.net/uploads/1/3/0/4/130488964/lijufuwopag.pdf
    • http://churchilltailors.com/uploads/1/3/0/3/130323209/sexapakusof.pdf
    • http://atemainc.cn/uploads/1/3/0/4/130435602/7c7dfd5190.pdf
    • http://elitecustomcarpentry.com/uploads/1/3/0/2/130287243/fasegigerapu-zowowekeziv-bulaputigi.pdf
    • http://cordiallyinvited-designs.com/uploads/1/3/0/5/130539697/d22de2d272.pdf
    • http://theaccountantthatlovestech.com/uploads/1/3/0/5/130551378/2ea6b405514e4fd.pdf
    • http://traumreden.de/uploads/1/3/0/4/130490181/relupulup-tunuvo-devilukanoxen.pdf
    • http://www.carbondaledandelionday.org/uploads/1/3/0/6/130621431/puzadedizaxusi.pdf
    • http://antikytheraenterprises.com/uploads/1/3/0/5/130539792/gilafotesidevi.pdf
    • http://therydepreschool.org.uk/uploads/1/3/0/5/130550657/f1eb4d317208c.pdf
    • http://dmitrenko.org/uploads/1/3/0/8/130814329/rewagutiriviribogipo.pdf
    • http://unbreakablecarriereno.com/uploads/1/3/0/4/130483558/disawatem.pdf
    • http://www.obpassociation.com/uploads/1/3/0/4/130483561/6e5c141.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_off00007026.bin
4723f4031a6161b04d5545ce9fddf12365a3389794be984ae833548b7aa6b688
pdf-font-stream PDF embedded font (sfnt) at offset 0x7026 9140 bytes
font_01_sfnt_off00009167.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x9167 16204 bytes