Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d585bcd376b0f33…

MALICIOUS

PDF

38.1 KB Created: 2020-05-27 18:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 184f251bc3ae4c381e07b8dda1bc0497 SHA-1: d4b693a0a47c71f4f41cf4d1328ecb6b354c84a4 SHA-256: 6d585bcd376b0f33ba6bdb32a68586f304bc93ba6043f7a06c619e40489e713e
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links to external websites, many of which appear to be part of a link farm designed to obscure malicious activity. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest the PDF is designed to redirect users to potentially harmful content. No scripts were extracted, but the extensive use of external URLs points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://akinspiredwritings.com/uploads/1/3/0/4/130477541/130477541.html#spanish+books+pdf
    • http://festivalnunlocal.es/uploads/1/3/0/6/130620716/bagifuxor_bunutimedigij.pdf
    • http://applied-online.ca/uploads/1/3/0/2/130274368/3400077.pdf
    • http://teamclm.com/uploads/1/3/0/5/130539840/fezim-fijibuwigimexe.pdf
    • http://chinoxx.com/uploads/1/3/0/7/130739188/7923275.pdf
    • http://vernevisitors.org.uk/uploads/1/3/1/3/131398243/kopir_dezasinufonifaw_zivuxaf_lazelifopanemir.pdf
    • http://gvsupermercado.com/uploads/1/3/0/7/130776262/rawotiduxebezukabun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off000068cf.bin
0e991b51ccd7c5f61fd8f1c73c22c31e380a576a0f7296d5e5c3a933ee3d652a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68CF 10984 bytes

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