Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ee61492c96f8359…

MALICIOUS

PDF

34.3 KB Created: 2020-06-03 12:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94864bf4e62fa4048213db753fed8ab0 SHA-1: a3862e3907ec4b8294091d9fe6fa459979ae6c02 SHA-256: 6ee61492c96f83594bd11efc8ac0ea7195e8017ad65e85c45faeece8cbf83cfd
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 domains structured for SEO or link farming. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to redirect users to potentially harmful content hosted on these external sites. While no scripts were directly extracted, the PDF's nature and the numerous external URLs suggest a malicious intent to lead users to malicious pages.

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://host48.carmichaelnl.com/uploads/1/3/0/3/130379381/130379381.html#berlitz+complete+guide+to+cruising
    • http://thehadlowtower.com/uploads/1/3/1/3/131381946/7304912.pdf
    • http://faenakosher.com/uploads/1/3/1/1/131163841/pijuzowivovavexapev.pdf
    • http://nndc-india-foundation.com/uploads/1/3/0/3/130323647/8382352.pdf
    • http://vgplumbing.com/uploads/1/3/0/2/130271159/23f9cf913718e.pdf
    • http://jaajjansoozi.com/uploads/1/3/1/4/131437926/6029217.pdf
    • http://themarchofhistory.com/uploads/1/3/0/6/130639532/pubowepubefokijedor.pdf
    • http://host48.carmichaelnl.com/uploads/1/3/0/3/130379381/terms.html
    • http://host48.carmichaelnl.com/uploads/1/3/0/3/130379381/dmca.html
    • http://host48.carmichaelnl.com/uploads/1/3/0/3/130379381/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ragupawagev.files.wordpress.com/2020/06/nejosujitutejomotareg.pdf
    • https://fugebetowipo.files.wordpress.com/2020/05/6829356381.pdf
    • https://wogareverep.files.wordpress.com/2020/05/jupelezagemedimanofuwinaj.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_off0000597a.bin
0cd7e360c8eb77a2c3c39b336be9b7b1e6afec989ac95311a48135185b9c6bc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x597A 10644 bytes

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