Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d3d2dd03d4b721…

MALICIOUS

PDF

39.3 KB Created: 2020-03-23 03:49:30 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a761fbf8ff6ec623f032e5879f0d47ae SHA-1: 1e31b9fa7c4c887900f4c0fdb764c61009dd985c SHA-256: 64d3d2dd03d4b721867477858ab89912f1b58909dfb17fa95cb2c5027644a648
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to other PDF files on different domains. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malicious content or improve search engine ranking for harmful sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://poweredbytheblueoval.com/uploads/1/3/0/9/130969925/130969925.html#oracion+al+justo+juez+para+la+corte
    • http://staffpicked.com/uploads/1/3/0/3/130323600/4c5230a75c.pdf
    • http://termx.co/uploads/1/3/0/4/130483811/bixanagi.pdf
    • http://viennarooms.com/uploads/1/3/0/7/130775971/1801448.pdf
    • http://mrsparsons.net/uploads/1/3/0/8/130813582/kenabumevi_gidovilu_renumelote.pdf
    • http://jblackbird.net/uploads/1/3/0/3/130313471/7062094.pdf
    • http://www.positivitymagic.org/uploads/1/3/0/6/130639687/fafipuleg.pdf
    • http://vivian-lam.com/uploads/1/3/0/7/130740222/vonolipumunuf_novufizakin_danewusixurab.pdf
    • http://etlbdl.org/uploads/1/3/0/3/130313564/jobero.pdf
    • http://forestgrovechiropracticclinic.com/uploads/1/3/0/3/130313360/884256.pdf
    • http://experiencebluegrass.net/uploads/1/3/0/7/130739298/jukukoki-fanilavadelofa.pdf
    • http://mobilitypricing.ca/uploads/1/3/0/7/130775435/melalevozolote.pdf
    • http://www.belfastdrivered.com/uploads/1/3/0/6/130639317/wimubivabebotagemot.pdf
    • http://alleviatepharms.com/uploads/1/3/0/8/130874169/381148.pdf
    • http://licitaon.net/uploads/1/3/0/6/130639700/09a56d53.pdf
    • http://monsoonconsulting.biz/uploads/1/3/0/8/130873787/puxibujoditefib.pdf
    • http://wausauschoolofperformingarts.org/uploads/1/3/0/7/130739924/31b232.pdf
    • http://partnersinrelief.com/uploads/1/3/0/8/130874130/3a174b68fde4ea6.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_off00006fb1.bin
2dca0a8c271955e16c68269b0b7a8fc4de4882530ae41cbc68ecb3b47ccc2a98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB1 8348 bytes

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