Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b830f8c0b52b684…

MALICIOUS

PDF

33.3 KB Created: 2020-04-21 14:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d3ac3433bdc21baa9c0b4b988e0eb655 SHA-1: 0b0750440f7214c76acb28de8cd48c0d662c5cd3 SHA-256: 9b830f8c0b52b684e7fd05783e92115179ae096dd7989a575060b1380aaf3043
94 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious. It contains a large number of external links, many of which point to domains that appear to be part of a link farm designed for SEO manipulation. The document body, though heavily obfuscated, contains a URL that matches one of the extracted external links, suggesting an attempt to redirect users. No scripts were extracted, limiting the analysis of direct malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://ecgcore.com/uploads/1/3/0/4/130478295/130478295.html#aerodynamics+pdf+free
    • http://lorenzettiinformatica.info/uploads/1/3/0/9/130969052/jufetonipabod.pdf
    • http://blynxboutique.com/uploads/1/3/0/4/130483260/e9eb337f273eb47.pdf
    • http://myrealestaterx.com/uploads/1/3/1/0/131069991/diguwazegupuxub.pdf
    • http://sherilynlaurie.com/uploads/1/3/1/3/131379049/tojadoxobi.pdf
    • http://epicofficeprinting.com/uploads/1/3/0/4/130478484/ravigivasasuk-nigazuxi-xuxejigobujinu.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_off00005af0.bin
88006dbad67a042b9a21b5dd6b474d8f0a1bce8f95d5cc1df5611fadb2b93521		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF0 7956 bytes

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