Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a273a8d485da3d…

MALICIOUS

PDF

31.9 KB Created: 2020-05-13 13:38:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d9cf83fc2c6800c978e72d2a09d4e809 SHA-1: b79143ed9df7b587db05d4e5501bf1eb51aff012 SHA-256: a2a273a8d485da3db5e926035fcda3b183c15bb5cf94356de6d584a125f446bb
94 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body, though heavily obfuscated, includes text suggesting it's a 'Formal email example uk', which serves as a lure. The ML classifier strongly indicated maliciousness. The primary attack pattern involves redirecting the user to these external sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://gospelbridge.org/uploads/1/3/0/7/130776042/130776042.html#formal+email+example+uk
    • http://ralivladi.info/uploads/1/3/0/7/130740490/8181548.pdf
    • http://yvettara.de/uploads/1/3/0/7/130776858/774dff662ff2b.pdf
    • http://velascopaintingandconstruction.com/uploads/1/3/1/0/131070719/pizexosub-zikixaw-zetajogudova.pdf
    • http://happycows.net/uploads/1/3/0/3/130313605/dadorofakexotuvul.pdf
    • http://wpcg.org/uploads/1/3/0/4/130483697/9240313.pdf
    • http://innocentsoul.org/uploads/1/3/1/4/131455636/sisibokiwax.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_off000051ad.bin
311d9cec1ea483420ae34863b3e2b0148b551667af6b029e4ccd58c7ea2b9b6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51AD 10480 bytes

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