Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c66cb1003c3c989…

MALICIOUS

PDF

48.5 KB Created: 2020-04-05 12:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f9b4452c7e9fe0de1e5d38944d57ee9f SHA-1: 11d82f5aad1ba004473fccc97792efd720a63851 SHA-256: 4c66cb1003c3c9898b57c88c8b69a3ca7fcb77176d23bae9b4134b99a9b72752
94 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 similarly structured URLs on different domains. The document body, though partially corrupted, contains text suggesting it is a monograph, which is likely a lure to encourage users to click the embedded links. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm, suggesting a coordinated effort to drive traffic to these sites, potentially for SEO manipulation or phishing.

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/1/3/1/4/131452941/131452941.html#ejemplo+de+una+monografia+corta+con+sus+partes
    • http://bkdatl.com/uploads/1/3/0/7/130739571/sirizo_muzeteputopi_vosir_guposatesexijo.pdf
    • http://brassbandradio.com/uploads/1/3/0/9/130969599/godilewukekut-vowevapajod-nibuzivawe.pdf
    • http://3700lakeside.com/uploads/1/3/0/2/130272332/286864.pdf
    • http://gregseidel4winterpark.com/uploads/1/3/0/2/130270898/6a8d03.pdf
    • http://azac.eu/uploads/1/3/0/9/130969728/gibeviwovekavul.pdf
    • http://becomeaconqueror.com/uploads/1/3/1/3/131380263/3669fd5d9787dc5.pdf
    • http://hostmaster.re-mortgagemyhouse.co.uk/uploads/1/3/1/3/131384599/bixipitukevi.pdf
    • http://jess-patrick-2019.com/uploads/1/3/0/6/130604336/dibem-nulumisasemokot-mobalo-minobokur.pdf
    • http://brittanylord.com/uploads/1/3/1/0/131069777/busufovinog.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f5c.bin
c77bd2bc1c710e7de87ccc933a6e9c7757b144874dcda198dc094536dad877a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F5C 8184 bytes
font_01_sfnt_off00009d81.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D81 16204 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.