Malicious PDF — malware analysis report

Static analysis result for SHA-256 60177141526da34d…

MALICIOUS

PDF

32.4 KB Created: 2020-06-01 00:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4c96b3c1ab9d4196cd2ac55a865b52b SHA-1: 8099815c155d22a0c0e8c3c6e653663a6ea5f6e1 SHA-256: 60177141526da34df3bc397f1ddd7493db0bcfcc2780a85a272894369fbfa8c1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded URLs, many of which point to external sites that appear to be part of a link farm designed to host malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a large number of external links. While no scripts were directly extracted, the structure and heuristics suggest the document is intended to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://3g0.undesirable.us/uploads/1/3/0/2/130289019/130289019.html#midland+public+alert+manual
    • http://hostmaster.thebigcanvas.co.uk/uploads/1/3/0/6/130621771/kexegotebefoguvuwa.pdf
    • http://mborganizing.com/uploads/1/3/0/7/130738658/4f28556.pdf
    • http://kaitheology.com/uploads/1/3/1/3/131384208/7269372.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://sibasux.files.wordpress.com/2020/05/bukasebozeduka.pdf
    • https://kavuzolujor.files.wordpress.com/2020/05/libut.pdf
    • https://bomukibi.files.wordpress.com/2020/05/9126392651.pdf
    • https://tinugezova.files.wordpress.com/2020/06/pirepe.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005459.bin
490f98aafc9fbaeffb11976432f3d93f04f8eebd32c71836ff4292b92a8b3bbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5459 10148 bytes

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