Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ed6152b4f4ac3a…

MALICIOUS

PDF

48.4 KB Created: 2020-04-11 09:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ee76381edcdc2086bb987a929e255df0 SHA-1: cd713567eccbd8347b26f934a749bc91ccdde27a SHA-256: 82ed6152b4f4ac3a752104fbf04c95e59b54f05c32baa2c76fec6d941cb61ac4
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDFs hosted on various domains, indicative of a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The embedded URLs and the heuristic firings suggest a campaign focused on SEO-poisoning or driving traffic to malicious content. No scripts were extracted, limiting the analysis of direct payload execution.

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://clarkdentalassociates.net/uploads/1/3/0/6/130621124/130621124.html#tips+for+darkest+dungeon
    • http://sweetcarolineliving.com/uploads/1/3/0/7/130776460/aee42165.pdf
    • http://gregoryfanning.com/uploads/1/3/0/3/130324136/sinuzawoximitew.pdf
    • http://aumkarayurveda.com/uploads/1/3/0/6/130604165/bomatadarobegaz.pdf
    • http://mypersonalgifter.com/uploads/1/3/0/2/130289583/saruloxogulajaf.pdf
    • http://7addik.com/uploads/1/3/1/4/131438280/063d0.pdf
    • http://huntingtonbeachmurals.com/uploads/1/3/0/6/130640200/ec5cbb5d850c87.pdf
    • http://mahablanket.com/uploads/1/3/0/6/130604175/bb91784cb2.pdf
    • http://diamondbellranch.com/uploads/1/3/0/6/130605206/8751898.pdf
    • http://hbiart.com/uploads/1/3/1/1/131163945/davomorebokanod.pdf
    • http://initialgeek.com/uploads/1/3/0/3/130313803/sajatekozi-kimiguxix-vitiso-kotekerafulu.pdf
    • http://oilbossacademy.com/uploads/1/3/0/2/130270945/wobitumizekubu_mogojivi.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_off00009738.bin
5b6f235465725543bb18a1c1cbf3dde81132e8e0a7f500c0b77f9d37851c4a7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9738 8100 bytes

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