Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1e9a4cb03da0f7…

MALICIOUS

PDF

44.3 KB Created: 2020-04-04 11:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c67257867aa79db0ad43fee9aeee0c7a SHA-1: 3479904dcf4c4d9602a448dfa1479a4d70b44135 SHA-256: ac1e9a4cb03da0f713cd2aca5a07feaaa947d6d6daeab1d2089063ab29ca2e0b
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The document body contains garbled text and the title 'Que era rep ubblica bananera', suggesting a potential lure or distraction. The embedded links point to a network of domains, many of which follow a similar naming convention and structure, indicating a coordinated effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bejustalittlebetter.com/uploads/1/3/0/7/130776866/130776866.html#que+era+rep%C3%BAblica+bananera
    • http://takecareguardianship.biz/uploads/1/3/0/6/130639205/xumugibof_danadugu_wokulegik_lelepobikojixo.pdf
    • http://martineventteam.com/uploads/1/3/0/5/130588191/fepaxalomixuguruj.pdf
    • http://physicalcultureproject.com/uploads/1/3/0/6/130639175/ruxurupodumilefi.pdf
    • http://cwtechsummit.com/uploads/1/3/0/4/130488486/rifogoropoz.pdf
    • http://cubriendocfl.net/uploads/1/3/0/9/130969695/lofukixob-bipipinisafowug-xeliponopude-masolekajani.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_off00007ff2.bin
5dc39ca2d9de12e7e1241e9e71bebbfb6d0115740839b4c866946f52f382ef9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF2 9784 bytes

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