Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae5f8bc8ccbfda0…

MALICIOUS

PDF

42.3 KB Created: 2020-03-09 08:17:09 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c8d1167cfdfccf97fd450dcdeabbb037 SHA-1: 3a29932a472f11ccdc95805cd969d80ae5302e14 SHA-256: aae5f8bc8ccbfda0d58201ca3924b3ec7b3df3eb142f6d455f4dcb915e0b2c7b
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or redirection mechanism. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to a multitude of external PDF files, likely to distribute further malicious content or for SEO manipulation.

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://74-123-73-95.mgwnet.com/uploads/1/3/0/6/130620869/130620869.html#akiane+kramarik+sua+historia
    • http://saintaidansfestival.co.uk/uploads/1/3/0/4/130477083/654295b64cd.pdf
    • http://stihi.info/uploads/1/3/0/7/130775742/pimuwore_sudovigojize_vubera.pdf
    • http://mail.churchweddingspaphos.com/uploads/1/3/0/8/130874063/3272527.pdf
    • http://franksamslawncare.com/uploads/1/3/0/6/130639853/muwotumelefu.pdf
    • http://clean-cooling.org/uploads/1/3/0/4/130435673/tuwazugefiwizela.pdf
    • http://woodvalepizza.com/uploads/1/3/0/2/130291415/1394256.pdf
    • http://driving-instructor-tuition.com/uploads/1/3/0/3/130379529/bovitevafubilaz_dizudafavuxugor_xodilesaxiwem.pdf
    • http://awispaloalto.org/uploads/1/3/0/9/130969684/98554.pdf
    • http://dcsummerleague.com/uploads/1/3/0/4/130436171/sutebilosuvizor.pdf
    • http://mochasandjavas.net/uploads/1/3/0/7/130775588/06f3fbab.pdf
    • http://mrsmichelebrown.com/uploads/1/3/0/6/130605015/8868637.pdf
    • http://thewomensavenue.org/uploads/1/3/0/4/130476564/judogejemidamak.pdf
    • http://www.drstevekoc.com/uploads/1/3/0/7/130776680/4101960.pdf
    • http://suterafamilydentistry.com/uploads/1/3/0/6/130639370/9901665.pdf
    • http://alexpbolling.com/uploads/1/3/0/6/130639408/ziviguniwepe.pdf
    • http://wukun.com/uploads/1/3/0/5/130589396/6840232.pdf
    • http://lhs98.com/uploads/1/3/0/6/130621060/zipek.pdf
    • http://louisvillemoldsolutions.com/uploads/1/3/0/6/130639658/3559265.pdf
    • http://dishinthedirtmoms.com/uploads/1/3/0/7/130776267/7437269.pdf
    • http://taylorsinclair.com/uploads/1/3/0/7/130775727/7828401.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d94.bin
8d3920deaf2a61d0d85192dbbf57272c47cce8bb45d27b2a79621c0ed1e4943e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D94 10480 bytes
font_01_sfnt_off00009080.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9080 2652 bytes

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