Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b129997e4126ec6…

MALICIOUS

PDF

76.8 KB Created: 2020-04-04 14:39:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f0e85a0dfac4e6a33c098cfc63843e3f SHA-1: b4eac3e2dd6be357dc88298d003dc6939d332e1b SHA-256: 4b129997e4126ec6835dd0fa87e46e38cd0c13455d9f7d6bf481bf55e6c68673
94 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm. The primary URL, http://skaosg.net/uploads/1/3/1/4/131410187/131410187.html#mr+banks+actor+mary+poppins+returns, is part of this farm. The ML classifier strongly indicated maliciousness. The document body text is heavily obfuscated and contains what appears to be metadata rather than user-facing content.

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://skaosg.net/uploads/1/3/1/4/131410187/131410187.html#mr+banks+actor+mary+poppins+returns
    • http://bestclinicla.com/uploads/1/3/1/4/131406600/4473558.pdf
    • http://learntoroar.com/uploads/1/3/0/5/130588772/noretixa_mewag_mirowadosa_mitiwari.pdf
    • http://sherrycrawford.ca/uploads/1/3/0/6/130604153/pisivegogij-zivamewiw.pdf
    • http://solustand.com/uploads/1/3/0/7/130739362/sakajevizazanap.pdf
    • http://pathwaygems.com/uploads/1/3/0/4/130476385/medibi-timiw.pdf
    • http://docentcoaching.com/uploads/1/3/1/1/131164024/lorezajib.pdf
    • http://givinghandsassociation.com/uploads/1/3/0/5/130551162/d70cfd8.pdf
    • http://mountbarkerstrathcatholic.com/uploads/1/3/0/6/130620964/vigusixiwoz-punepesexon.pdf
    • http://nationalvendingbot.com/uploads/1/3/0/6/130639764/vawoluka.pdf
    • http://vorbata.net/uploads/1/3/0/2/130287872/9aa9d.pdf
    • http://donluis.net/uploads/1/3/0/2/130289019/wowos.pdf
    • http://striveline.com/uploads/1/3/0/7/130739779/3802541.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_off0000ed14.bin
a79569b5f125bcaf7c8022bc2df2159b19f914ead9b4489fd3c92b2e35c810e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED14 9300 bytes
font_01_sfnt_off00011012.bin
677e71428f97d697e1d37b94920902cc1f79d6c40420e53eae369df573da2ac3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11012 16192 bytes

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