Malicious PDF — malware analysis report

Static analysis result for SHA-256 315c14e9fb312e58…

MALICIOUS

PDF

33.8 KB Created: 2020-05-26 22:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0e7693099a0fc3ffb8a29fdc8a2498d SHA-1: f03be8efd0a43d9b999a69a48ca709e150c71ef6 SHA-256: 315c14e9fb312e58e5f884bec7fddf2623cd8eb355b1ca5369272b002dd63dcf
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to similarly structured URLs on various domains. This pattern is indicative of a link farm or redirection scheme designed to lead users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://kbknitsforyou.com/uploads/1/3/1/8/131856119/131856119.html#http+www+irfanview+com
    • http://studio10glamour.com/uploads/1/3/0/6/130603838/sikalidezof_zanatikipusarek.pdf
    • http://carlkatz.com/uploads/1/3/0/6/130639296/e4387daa34.pdf
    • http://susannahscott.com/uploads/1/3/0/3/130379114/nanomivagetakul-jesilep-seliw-gelodapo.pdf
    • http://publicspeakingwisdom.com/uploads/1/3/1/4/131406281/58969.pdf
    • http://clearbramilwaukee.com/uploads/1/3/0/4/130476102/zudusekavirufaxamife.pdf
    • http://epapa.org/uploads/1/3/0/7/130776220/zasutukolidudap.pdf
    • http://massagebychristina.live/uploads/1/3/0/8/130873843/5576546.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_off00005bfa.bin
685d138cfe977a960b16cdf61ff063712759b01033f568cf391bc9e22d26d388		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BFA 9532 bytes

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