Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ba8ab2cb574a38…

MALICIOUS

PDF

37.1 KB Created: 2020-04-07 10:40:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c56e6bc079518bc2f2cdf44b21fda818 SHA-1: a25185f11797743d41a6da3e21ecc9d9dc185014 SHA-256: d9ba8ab2cb574a38b243b17a67ba2c37f8e16f821910c445c047c50337e10fb1
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The presence of numerous, similarly structured URLs suggests a coordinated effort to distribute malicious content or host phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://taoswellwoman.com/uploads/1/3/0/6/130621020/130621020.html#media+armonica+geometrica+e+aritmetica
    • http://slautoworx.com/uploads/1/3/0/4/130489467/dojoxejakoluj.pdf
    • http://dannyswheeliebigadventure.com/uploads/1/3/0/4/130488565/6b866589b3edb.pdf
    • http://prstudio15.net/uploads/1/3/0/4/130477152/4839881.pdf
    • http://lunafeli.com/uploads/1/3/1/3/131398542/6286000.pdf
    • http://pacificcarehome.net/uploads/1/3/1/4/131413678/nukomudozag.pdf
    • http://cinful.online/uploads/1/3/0/6/130604536/6fa7c21.pdf
    • http://harleesalazarphotography.com/uploads/1/3/0/6/130621587/visibeko-jexuw-muwik.pdf
    • http://goodday420.com/uploads/1/3/0/7/130776277/wopewotodis-mikadusozo.pdf
    • http://temanbaiksukoharjo.com/uploads/1/3/1/4/131438225/2594039.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_off000066eb.bin
86bf6826443a4ea392da0cafb1c0520cf55ea120cf57d611a1173c341f43148a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66EB 9116 bytes

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