Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eb83d9334777a8a…

MALICIOUS

PDF

33.6 KB Created: 2020-06-02 21:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28da3bfcb5d1defa33ec367941eecc04 SHA-1: 8ee06636b3a1194240a2a0c4208c4bbe1206bd36 SHA-256: 2eb83d9334777a8acf0432c3d9043490594dae9a4498b2f23db0a54641b2b049
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body, though partially corrupted, contains references to these URLs and appears to be a lure for a study guide. The primary intent seems to be directing users to these external sites, which are likely hosting malicious content or engaging in SEO abuse. No scripts were extracted from this sample.

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://kellymurphyteam.com/uploads/1/3/0/2/130287727/130287727.html#catcher+and+the+rye+study+guide+answ
    • http://majesticallips.com/uploads/1/3/0/6/130639209/6213212.pdf
    • http://eurostar-media.com/uploads/1/3/1/3/131398125/3877717.pdf
    • http://mooreequineevents.com/uploads/1/3/0/7/130739656/d4b0cc5.pdf
    • http://mta-sts.mx.elitegardensbynatalee.com/uploads/1/3/0/9/130969654/9631777.pdf
    • http://kellymurphyteam.com/uploads/1/3/0/2/130287727/terms.html
    • http://kellymurphyteam.com/uploads/1/3/0/2/130287727/dmca.html
    • http://kellymurphyteam.com/uploads/1/3/0/2/130287727/policy.html
    • https://dumabodu.files.wordpress.com/2020/05/7895802381.pdf
    • https://texazupux.files.wordpress.com/2020/05/zerakilajezipe.pdf
    • https://gijatok.files.wordpress.com/2020/05/tovorosava.pdf
    • https://vupowuforoj.files.wordpress.com/2020/05/18588627803.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_off0000595c.bin
4340b55117249ca9eff628e12e8dd68092815fc764d2c012dbce2228ec206217		 pdf-font-stream PDF embedded font (sfnt) at offset 0x595C 10260 bytes

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