Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d39e57ee597478…

MALICIOUS

PDF

35.4 KB Created: 2020-04-09 05:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f74af7ead2e4fef3bcf50f99baec0beb SHA-1: 0d0d4b757345f1a1e34e58aadb8873744575c633 SHA-256: e4d39e57ee597478729f09db6cc590dbf203dea3199511c59215b9cbcbeae5d0
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicative of a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves leveraging these external links to direct users to potentially harmful content or further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://beautifulyoukatiealtobelli.com/uploads/1/3/0/5/130541186/130541186.html#jon+duckett+javascript+and+jquery
    • http://anntatemedia.com/uploads/1/3/0/2/130272976/jupatefujegarodejonu.pdf
    • http://slobodancounselling.ca/uploads/1/3/0/4/130483993/7552948.pdf
    • http://kevankenney.com/uploads/1/3/0/8/130814387/57ce9c4184.pdf
    • http://starbagsptsd.net/uploads/1/3/0/4/130476207/363402.pdf
    • http://cbdirect.biz/uploads/1/3/1/3/131398498/8378100.pdf
    • http://geobiologiabarcelona.es/uploads/1/3/0/9/130969027/2acd04d4103e.pdf
    • http://homesuitedesign.com/uploads/1/3/0/2/130272266/9350056.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_off0000621d.bin
0956825c3c2cf84c6d71162864d0ec5514ed7db7b039ab3fc714251a4469b0d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x621D 8068 bytes

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