Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cc0d96fd8f857e5…

MALICIOUS

PDF

38.5 KB Created: 2020-03-13 01:37:12 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4ad9713d2fe87b820ee32f87dbb35cd0 SHA-1: fc6f74942ae76269af0533ede03a0c331bb8f1f9 SHA-256: 5cc0d96fd8f857e5464a12de2e43ebab56ebcb0aed6827992076de0dae0c936c
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or a method to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs supports a phishing or malware distribution attempt. No scripts were extracted, but the structure suggests the document is designed to redirect the user to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://host178.carmichaelnl.com/uploads/1/3/0/7/130775746/130775746.html#solving+a+system+of+linear+equations+algebraically+-+item+1630
    • http://vivoutloud.com/uploads/1/3/0/6/130604682/nomatulu-gavikedorilapub-xebatojimulide.pdf
    • http://www.reubenwalkerbaritone.com/uploads/1/3/0/8/130813921/1372182.pdf
    • http://www.clarepaniccia.com/uploads/1/3/0/6/130605104/cfeaaa713.pdf
    • http://mikesrefinishing.com/uploads/1/3/0/5/130540928/398414.pdf
    • http://unityofstockton.com/uploads/1/3/0/6/130640019/futuwugowoga-fulogoja-xewumute-bikis.pdf
    • http://okcrepair.com/uploads/1/3/0/9/130969862/983805.pdf
    • http://difficultdriving.com/uploads/1/3/0/5/130550690/7598916145.pdf
    • http://server.clientdemo.co.nz/uploads/1/3/0/4/130475932/pofomakajunejupa.pdf
    • http://inside-the-distance.net/uploads/1/3/0/8/130815095/caf7cf4e2a.pdf
    • http://aquase.net/uploads/1/3/0/2/130289327/vepabuvelovupesuv.pdf
    • http://healthandorincome.com/uploads/1/3/0/5/130588478/xufofe.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_off00006ea0.bin
08a9ee16d11acb7d7032aeae22cee7ffcde5565cf578a8aeb33b89f5a5658080		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA0 7868 bytes

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