Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc9efbac005dc7a…

MALICIOUS

PDF

48.5 KB Created: 2020-03-30 07:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e9d13087844a795ec1f2f4d9b7cd3ea4 SHA-1: b438d2830b5fc4bbdcd0a5d4b9874989c68e5273 SHA-256: 5fc9efbac005dc7a80276886822738882c667a471ec07bf23e349ea7e2450468
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The primary link points to 'http://74-123-77-252.mgwnet.com/uploads/1/3/0/2/130287246/130287246.html#antigua+civilizaci%C3%B3n+egipcia+organizaci%C3%B3n+social', which is likely part of a link farm or a lure to a malicious site. The ML classifier strongly supports the malicious verdict.

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://74-123-77-252.mgwnet.com/uploads/1/3/0/2/130287246/130287246.html#antigua+civilizaci%C3%B3n+egipcia+organizaci%C3%B3n+social
    • http://dumptruckstevesadventures.shop/uploads/1/3/0/5/130588286/perod.pdf
    • http://marig.se/uploads/1/3/0/2/130270864/luxudafikono.pdf
    • http://mansonscloset.com/uploads/1/3/1/1/131163962/josajek.pdf
    • http://josephdeleon.com/uploads/1/3/0/6/130620603/ebddaaaa4f14ff1.pdf
    • http://thunderbirdsfoundation.com/uploads/1/3/0/5/130551282/c6753289ab5f.pdf
    • http://downundermigration.com/uploads/1/3/1/4/131437669/608184.pdf
    • http://nursesdirectllc.com/uploads/1/3/0/9/130969278/8144642.pdf
    • http://bigcitygraphics.ca/uploads/1/3/0/8/130873787/78984.pdf
    • http://conneracup.com/uploads/1/3/0/4/130483519/mufuguka.pdf
    • http://kerrycannon.com/uploads/1/3/0/5/130589229/1984063.pdf
    • http://fielddaycreativeco.com/uploads/1/3/0/7/130739153/9753380.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_off0000914f.bin
a019c5604ddff844025de39d0ec58d8417f6adbe3d8579376b3c7b92911bd9d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x914F 9244 bytes

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