Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a139a3b423ed04…

MALICIOUS

PDF

49.2 KB Created: 2020-05-14 14:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1d40a8a8ad0f390022c981689da106d0 SHA-1: bd74b35591b21e37ebbeef8306ea10eb85217dde SHA-256: 25a139a3b423ed04b59648bdd36893d8e0b348e145a531b2dc6923d51ea2d422
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains text related to 'Esophageal cancer guidelines uk' and mentions 'wkhtmltopdf', suggesting a lure to potentially malicious content hosted on the numerous extracted URLs.

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://marmarworld.com/uploads/1/3/1/6/131637276/131637276.html#esophageal+cancer+guidelines+uk
    • http://paintretainer.org/uploads/1/3/1/3/131379525/baxutapi-guzisetefa-tefabutap-powifajofol.pdf
    • http://hokukaiphotography.com/uploads/1/3/1/4/131406893/kivaduve_xugusudiketusa_pikomogelokasib_tazejaruwuzij.pdf
    • http://visiontoheal.net/uploads/1/3/1/3/131383977/zibafajes.pdf
    • http://adodistribution.com/uploads/1/3/1/4/131454482/vidiwefev.pdf
    • http://beyondtrim.com/uploads/1/3/1/8/131871954/1e869bc.pdf
    • http://mannylopezconstruction.com/uploads/1/3/0/3/130313215/tuwemomimoxe.pdf
    • http://simplyhello.com/uploads/1/3/0/5/130590561/e5daa323b8.pdf
    • http://plussizebridalsma.com/uploads/1/3/0/4/130477719/f8de229d5.pdf
    • http://djtommyd.com/uploads/1/3/0/8/130874153/boledumofiwip_jirakag_mejebekulofut_vorigamileviva.pdf
    • http://msbennettsclass.com/uploads/1/3/0/7/130775846/terunozetazofi_dadev.pdf
    • http://nexgentestosterone.com/uploads/1/3/1/4/131438419/debew-fuzipuwome-xujeba.pdf
    • http://617567757374656e.com/uploads/1/3/0/2/130270873/vagoxir.pdf
    • http://oiemi.com/uploads/1/3/0/2/130288523/8fd82d1.pdf
    • http://federalsolutions.com/uploads/1/3/0/5/130538816/09e355e70b.pdf
    • http://thirddraftlife.com/uploads/1/3/0/3/130379711/fad40ee501.pdf
    • http://drumvoice.org/uploads/1/3/0/6/130621134/5279071.pdf
    • http://prepandprimehairstudio.com/uploads/1/3/0/2/130270934/kirabomomoxeziv.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_off00009525.bin
14269e3daaea36d12f277df4e6d7a2385c567680d3663435ea7e7a67fe45b132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9525 10660 bytes

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