Malicious PDF — malware analysis report

Static analysis result for SHA-256 918ebef8653c7c59…

MALICIOUS

PDF

33.0 KB Created: 2020-05-20 22:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 263732bb24111c394e33ac3dee249226 SHA-1: 4867b2e6db07ea87696a249081934e258bdc0418 SHA-256: 918ebef8653c7c595a67ba6c893553b0ecd30c53b959385bf282fcb5fbeeb775
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Dropper.Agent-8889117-0 and the ML classifier assigned a high probability of maliciousness. The document contains a significant number of external links, many of which point to domains that appear to be part of a link farm designed to host further malicious content. The presence of these numerous external links strongly suggests a role as a dropper or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.Dropper.Agent-8889117-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8889117-0
  • 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://veronicacastroweddingplanner.com/uploads/1/3/0/3/130323162/130323162.html#abyssinia+bet+app
    • http://yawushu.org/uploads/1/3/0/3/130323406/80e4f158b9f4de.pdf
    • http://sebrysolutions.com/uploads/1/3/1/3/131398272/6852596.pdf
    • http://enrouteboutique.com/uploads/1/3/0/8/130814241/5828665.pdf
    • http://photovoltaikgefaehrten.com/uploads/1/3/0/5/130548192/358613335fca.pdf
    • http://gloryinternationalministries.org/uploads/1/3/1/1/131164021/57713.pdf
    • http://fairfieldhomeinspection.net/uploads/1/3/0/6/130621413/pojepifiwoxugu-mekenunej-redap.pdf
    • http://annelisemeckelaert.com/uploads/1/3/0/4/130435857/jexitesejew.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_off00005668.bin
2940f856fd25bd812d88b7a2aaf8fb51ce7a356ff8e2c540f145d366bacb9b78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5668 10208 bytes

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