Malicious PDF — malware analysis report

Static analysis result for SHA-256 8daeaec4860793b9…

MALICIOUS

PDF

40.8 KB Created: 2020-05-26 16:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb57d42a51c5f325026165acbcef9644 SHA-1: 7055f85f60c53c77e0cc8acbb25cd7316d87e783 SHA-256: 8daeaec4860793b90ddca52e927e5863947e4e614c2adb5f60b717add74ddc60
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which are dynamically generated and point to suspicious domains, indicating a link farm or redirection mechanism. The ML classifier strongly flagged this PDF as malicious. The embedded URL 'http://4ek.undesirable.us/uploads/1/3/0/6/130621530/130621530.html#webmail+uel+br+src+redirect+url' suggests a webmail lure, likely intended to phish credentials or redirect to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://4ek.undesirable.us/uploads/1/3/0/6/130621530/130621530.html#webmail+uel+br+src+redirect+url
    • http://eirljouyromain.com/uploads/1/3/0/9/130969754/nunamowumof-nalise-wejugu-rikuxe.pdf
    • http://hollysbeautifulbrides.com/uploads/1/3/0/6/130639659/sewaposene-wokukofumej-muperem.pdf
    • http://lifeexerciseonline.com/uploads/1/3/1/1/131164039/jisopuzefuje.pdf
    • http://buyahouseinbarrie.com/uploads/1/3/0/2/130289630/votegeku-tegofofuwag.pdf
    • http://vacationrentalstrategy.com/uploads/1/3/0/6/130620420/dusoxubox.pdf
    • http://lojabrubru.com/uploads/1/3/0/2/130274368/e6f8ca9.pdf
    • http://test.real-fake-doors.com/uploads/1/3/0/6/130639192/7403172.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_off0000715c.bin
f850bb4e53afce4c2cea720e84a58058ced469876be5656942824f4554b7bc7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x715C 11276 bytes

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