Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b588b6f42ebd030…

MALICIOUS

PDF

29.6 KB Created: 2020-04-20 05:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e1262c86fee0e029535511ad1f227af3 SHA-1: da6f820bbf25b9d0050cbcba6d08554b20ed8649 SHA-256: 2b588b6f42ebd0308bbbfa1f7b4b29eb57eaa7a6c220943af0740413bb20771c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document exhibits characteristics of a link farm, with a high number of external URLs embedded within its body. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious nature of the embedded links. These links likely lead to malicious websites designed for phishing or further malware delivery.

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://blacktreelofts.com/uploads/1/3/0/8/130814298/130814298.html#chrome+para+windows+server+2003
    • http://sungkyuntec.com/uploads/1/3/1/4/131406717/9168351.pdf
    • http://azzamarama.com/uploads/1/3/0/8/130874524/7596627.pdf
    • http://kimncamo.com/uploads/1/3/0/8/130813782/kirizaguxilero_pubudedogudoz_kujovuvesub.pdf
    • http://nikkigillette.com/uploads/1/3/1/3/131379035/rowomopotigur.pdf
    • http://mheseries.com/uploads/1/3/1/3/131379699/b5d9e08c2842d4.pdf
    • http://lauraldunnesq.com/uploads/1/3/0/2/130272501/21013.pdf
    • http://auralitymedia.com/uploads/1/3/0/6/130621785/lupuzaze-zuzodop-biwipimage.pdf
    • http://thisishournormal.com/uploads/1/3/0/2/130289397/jujorinokodabuben.pdf
    • http://islamilainenhautaus.info/uploads/1/3/0/5/130590663/konoxekelotoda.pdf
    • http://beautybynicole.co/uploads/1/3/0/6/130639510/720a3513.pdf
    • http://bolacuisine.com/uploads/1/3/0/5/130551063/xebif-lexobeje-nogub-ranadugifagego.pdf
    • http://ottawaartisansguild.com/uploads/1/3/0/6/130639524/supuwifeguni.pdf
    • http://mmcbayshore.net/uploads/1/3/0/5/130589412/jusufefetemexi.pdf
    • http://demotables.com/uploads/1/3/0/6/130639956/riworewivosadek.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_off000050df.bin
6a0a79348b46a4328103fb2e4d05f9d474d05bc2406e722a2c0f0c98ea0d16bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50DF 6196 bytes

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