Malicious PDF — malware analysis report

Static analysis result for SHA-256 6515269c27aee329…

MALICIOUS

PDF

33.5 KB Created: 2020-05-14 15:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ea8edf757bafd18331049e790d40dcd6 SHA-1: db111a477701e50815ce7a0a7fc0b0b242554577 SHA-256: 6515269c27aee3297aed9d646d233c63d5776617348a8c9e2d07c398bc111bd5
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are structured as a link farm. One prominent link, disguised as an Adobe Flash Player update, directs to a suspicious URL. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it being used for malicious purposes, such as downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://texaspridetv.com/uploads/1/3/0/5/130539696/130539696.html#adobe+flash+player+10.+1
    • http://livelegendaryllc.com/uploads/1/3/1/4/131454482/5826281.pdf
    • http://burracing.com/uploads/1/3/1/4/131407179/3811105.pdf
    • http://thehairgrowthinsitute.com/uploads/1/3/1/4/131406356/8953323.pdf
    • http://tuetinhonline.net/uploads/1/3/0/5/130543318/xonuvolovitedug-wakekadew-daxiwekipimema.pdf
    • http://kldesignstudios.com/uploads/1/3/0/7/130775607/5387123.pdf
    • http://csgladstone.com/uploads/1/3/0/5/130551339/141662adb8768.pdf
    • http://gchautomotive.com/uploads/1/3/0/7/130776790/vegol.pdf
    • http://shieldcreditprofessionals.com/uploads/1/3/1/4/131406473/xakutipewikifupu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00005858.bin
bea13f1b3994d7968a73a309a6883128dc06a25c2ba1f8486d0424f1e8c0319c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5858 10368 bytes

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