Malicious PDF — malware analysis report

Static analysis result for SHA-256 4716c90266c9e3e4…

MALICIOUS

PDF

28.7 KB Authoring application: OpenOffice.org
MD5: 20e3b86cebd073272540137fe1334211 SHA-1: dfd83c161641d00957f90e5fab811381ae44992f SHA-256: 4716c90266c9e3e43e22ff4300bc37bd8a822b74081a725663fb3981f4ac0608
152 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, directing users to various domains. The ClamAV detection as Pdf.Phishing.TtraffRobotInstall-7605656-0 and the ML classifier output strongly indicate malicious intent. The embedded URLs are likely used to host phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 3

  • 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.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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://nokub.sparepartsjumberca.com/uploads/2020/01/28/pukagukalave-lobazavu-xowusabepewo-nogezebu.pdf
    • http://posomuwi.samo.su/uploads/2020/01/29/logovufebir.pdf
    • http://oxhxo.net/uploads/1/3/0/5/130551141/3e01d.pdf
    • http://gomriz.com/uploads/1/3/0/4/130476501/130476501.html#platform+pumps+size+12

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00000fab.bin
b36706acc44ff0b375e5a418af21338c7bea37d867eeb66d6caac698403572bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB 8144 bytes

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