Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ebbc7bcad7901d…

MALICIOUS

PDF

35.4 KB Created: 2020-04-26 23:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f6adb4410912d0df570b75f08d41b320 SHA-1: ed0638582f7999d361958bd98776d31ae6db3a00 SHA-256: 99ebbc7bcad7901d005bc391b9a4e151a600de4b9a14e34ccda62b8fbf4cd3a1
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to domains that appear to be part of a link farm. The document body, though heavily obfuscated, contains references to 'Israel tourist guide pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to drive traffic to these external sites. The ML classifier strongly indicated maliciousness, and the presence of numerous unknown URLs supports a malicious intent, likely for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://thrifty.garden/uploads/1/3/0/5/130543537/130543537.html#israel+tourist+guide+pdf
    • http://lukalahfarm.com/uploads/1/3/0/6/130621591/nofijorimapez-fokav-vadudexofijebod.pdf
    • http://bracerental.com/uploads/1/3/1/1/131163563/2f62286e486cc0d.pdf
    • http://jennyhartzler.com/uploads/1/3/0/7/130775320/pukuvijuwa.pdf
    • http://elanabode.com/uploads/1/3/1/4/131437393/wowiril.pdf
    • http://saraygirard.com/uploads/1/3/0/3/130313784/garadipisogamiminow.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_off00006380.bin
e53db8c570cb04c7f3f06cf1419fcf064feb8f371b1d3e6615d9b90a62f3d070		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6380 7964 bytes

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