Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8647e4c9e1b26e5…

MALICIOUS

PDF

38.9 KB Created: 2020-06-05 02:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24f420bb9a32ba51a47a7a517cebb0d3 SHA-1: 0ab1004e0c465e69b6f2f3b7781522fcc14c20de SHA-256: e8647e4c9e1b26e50ffe1f3cab811c63981541db874f0ba325b4f1f34c6e81f7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which are hosted on suspicious domains and appear to be part of a link farm. The document body suggests a lure related to a "Six sigma practice test", likely intended to entice users to click on the embedded malicious URLs. No scripts were extracted, and the primary malicious activity observed is the distribution of links to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://e-erni.com/uploads/1/3/1/3/131384797/131384797.html#six+sigma+practice+test
    • http://ns.dovmc.com/uploads/1/3/0/7/130776125/sewusedujulaso_zuwepoji_ponasonif_ruvezulijowe.pdf
    • http://gclub.lucky1st.com/uploads/1/3/0/9/130969505/9dbec6.pdf
    • http://aviationwiki.net/uploads/1/3/0/7/130740489/gipavanumi_misavup_geminev.pdf
    • http://theloja.com/uploads/1/3/0/4/130436163/e3e41f18f2dd.pdf
    • http://crucifiedgirl.com/uploads/1/3/0/9/130969981/1170021.pdf
    • http://nautifoods.com/uploads/1/3/0/7/130775823/65ab04b25.pdf
    • http://celtac.com/uploads/1/3/0/6/130639309/lidozasisanevufu.pdf
    • http://jenniersmithlaw.com/uploads/1/3/1/1/131163494/6849829.pdf
    • http://e-erni.com/uploads/1/3/1/3/131384797/terms.html
    • http://e-erni.com/uploads/1/3/1/3/131384797/dmca.html
    • http://e-erni.com/uploads/1/3/1/3/131384797/policy.html
    • https://marexoxudu.files.wordpress.com/2020/06/28801891721.pdf
    • https://detekekud.files.wordpress.com/2020/06/52206934694.pdf
    • https://lilarawumevu185719009.files.wordpress.com/2020/06/varuroxifa.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_off00006c86.bin
2f3d31898e15b9aa0ee210d0c8c4dceef6e5e1d9857e7d2484e5357b82fa2374		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C86 10524 bytes

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