Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ca996e532ed511…

MALICIOUS

PDF

38.4 KB Created: 2020-06-18 08:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 6292c2d25edfb73dc79ab953d07d3102 SHA-1: c44c5697f03ecd8dde72ac65e1201ed9ffaf38f1 SHA-256: f8ca996e532ed51188161f66f6bf104f07872fee575aa28478f02db571fb0d02
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or distribution mechanism for further malicious content. The document body itself is largely unreadable, but the presence of numerous external URLs is the primary indicator of malicious intent. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://hostmaster.lorimerconsulting.co.uk/uploads/1/3/1/6/131606123/131606123.html#idaho+outfitters+and+guides+association PDF link annotation
    • http://thesweetiepiecompany.com/uploads/1/3/0/8/130874121/e7747739645b.pdfIn PDF document text
    • http://killtheherogame.com/uploads/1/3/0/2/130272342/katawat.pdfIn PDF document text
    • http://mail.irismigraineandwellness.com/uploads/1/3/0/4/130488701/9577443.pdfIn PDF document text
    • http://cannabisgrowingsupplystore.com/uploads/1/3/0/5/130551094/butewogebelivep_falipak_vapexizofowaru_sefefewo.pdfIn PDF document text
    • http://_carddavs._tcp.1eam.com/uploads/1/3/1/4/131452942/4275192.pdfIn PDF document text
    • http://lexmorshipping.com/uploads/1/3/0/5/130590355/xopakonan.pdfIn PDF document text
    • http://74-123-77-117.mgwnet.com/uploads/1/3/0/4/130476216/2901872.pdfIn PDF document text
    • http://socialsecuritydefender.com/uploads/1/3/0/6/130604046/zulowuxumezof-juziluga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57BB 5068 bytes
SHA-256: 7a343be8c72bcd6b71f345e97371be58eeacad50c1a8d6baa21e757815daf126
font_01_sfnt_off000068ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68ED 10320 bytes
SHA-256: d03c71873891dd76ffebe40f270d1835cfc3dea476c7ef57c6d53d675ed1c594