Malicious PDF — malware analysis report

Static analysis result for SHA-256 79229fd87eb83fbf…

MALICIOUS

PDF

43.5 KB Created: 2020-06-13 14:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5959dde719acb25cb1f34eebeb41240 SHA-1: 5d99028d99a6d3af02009e73ff7799a844586c86 SHA-256: 79229fd87eb83fbf7e5934b8d31c552c7e1df22ab3540eb95ec49bdbb5a26993
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. The document body contains garbled text but also includes URLs that are likely part of a link farm designed to manipulate search engine results or direct users to malicious content. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious classification.

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://pulque.com/uploads/1/3/1/1/131164174/131164174.html#kosgeb+i%25C5%259F+plan%25C4%25B1+%25C3%25B6rne%25C4%259Fi+word+2015
    • http://shawinsurancerealty.com/uploads/1/3/1/4/131453450/07d4fd02e1.pdf
    • http://office.seasholmen.org/uploads/1/3/0/5/130547150/5798358.pdf
    • http://premiumdetailingco.com/uploads/1/3/0/9/130968935/sewezim.pdf
    • http://778.bpmtc.com/uploads/1/3/1/3/131380065/954577.pdf
    • http://equinemassageschool.com/uploads/1/3/1/3/131398117/51007fd3488.pdf
    • http://cpcontacts.fairwaymemorial.com/uploads/1/3/0/5/130546457/dejetimezevigog-jifif-sawixawojuwi-puguguzaruj.pdf
    • http://mta-sts.tracymedeiros.com/uploads/1/3/1/3/131383332/ca81b009.pdf
    • http://autoaccidentlawyerswtl.com/uploads/1/3/0/6/130622077/6568137.pdf
    • http://vildro.com/uploads/1/3/0/8/130813635/3892217.pdf
    • http://katskornerinternational.org/uploads/1/3/1/4/131438202/razonegupel_boriz.pdf
    • http://hhehenryhamerenterprises.com/uploads/1/3/0/2/130289696/bibeme_pamipopav_wawijiti_zegupenisur.pdf
    • http://cpanel.lynn-gustafson.com/uploads/1/3/0/3/130323733/bowanegod.pdf
    • https://kawebori.files.wordpress.com/2020/06/18648530557.pdf
    • https://ziradodenu.files.wordpress.com/2020/06/lemugirasumefanojomimof.pdf
    • https://sexepik.files.wordpress.com/2020/06/lenotezuva.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065eb.bin
09b8348e7c2db1d2c2e4d3171914eea114202f23761d6f8e8ac73ebaa9beae4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x65EB 11604 bytes
font_01_sfnt_off00008a26.bin
028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A26 16312 bytes