Malicious PDF — malware analysis report

Static analysis result for SHA-256 52144c197a232e1f…

MALICIOUS

PDF

50.2 KB Created: 2020-06-20 01:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ef5170db098fa406a1c8d4364176fd5 SHA-1: 557432cf8299a9fa13523a58177ce0f5dd0e87ce SHA-256: 52144c197a232e1fc75ac1cac71793be6c8199048992930663e01e52da312280
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 to various domains, many of which appear to be part of a link farm designed to mimic SEO-optimized content. The ML classifier strongly indicated maliciousness. The primary attack pattern involves directing users to a network of these linked PDF files, likely as a distribution or redirection mechanism for further malicious activity.

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://masterfocusint.com/uploads/1/3/0/4/130483355/130483355.html#process+management+in+windows+nt+pdf
    • http://mindfulwear.shop/uploads/1/3/0/3/130313390/d8217aba87.pdf
    • http://elmarie-louw.com/uploads/1/3/0/6/130621335/6e4e3e616.pdf
    • http://mail.eventsbynicole.net/uploads/1/3/1/4/131455416/jomoli.pdf
    • http://classicocharlestonevents.com/uploads/1/3/0/2/130287279/5087449a.pdf
    • http://hostmaster.stepbystepweb.it/uploads/1/3/1/4/131455832/9285181.pdf
    • http://laiiihconsultants.com/uploads/1/3/0/6/130621006/0c85f84b.pdf
    • http://carmelomilazzo.com/uploads/1/3/1/3/131379194/40bfd537270c0f.pdf
    • http://rpgiq.org/uploads/1/3/0/6/130639395/ralumemufibom-jozejutaza-jazave.pdf
    • http://voltsinstalacoes.com/uploads/1/3/0/4/130476242/367f1370154.pdf
    • http://thatpossibility.com/uploads/1/3/0/8/130813417/6458566.pdf
    • http://anniedreams777.com/uploads/1/3/1/3/131379394/1163471.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_off0000866b.bin
e95dd8279da16986437476e399bdf30e753c80e89de75e09d8ad9056ee32c38a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x866B 5324 bytes
font_01_sfnt_off0000986e.bin
c529775a7e0f43c2fc244e8083cb548aa12bc0b91931265e2a2a074acaf86993		 pdf-font-stream PDF embedded font (sfnt) at offset 0x986E 10544 bytes

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