Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db0d1d0fa95a187…

MALICIOUS

PDF

32.4 KB Created: 2020-03-29 06:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0808620962f2cb83e740475706a2ab09 SHA-1: dcc53f3b4c0f21aac0e1618a8b7e97326ec39543 SHA-256: 8db0d1d0fa95a187fc6a55a44a216a8e721d9e7a2bd38d81e46c162a68743570
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains references to these URLs. The primary purpose appears to be directing users to a vast collection of other PDF files hosted across numerous domains, suggesting a link farm or a distribution mechanism for further malicious content. No scripts were extracted from this sample.

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://amazingjourneytravel.voyagerwebsites.com/uploads/1/3/1/1/131163666/131163666.html#funciones+en+cinemex+san+esteban
    • http://1012illinoisstreet.com/uploads/1/3/1/1/131164313/fa117761.pdf
    • http://9b48entertainment.com/uploads/1/3/0/7/130775293/fcdad5.pdf
    • http://petsinnsuites.org/uploads/1/3/0/5/130551449/d5ba5.pdf
    • http://www.zellue.com/uploads/1/3/0/5/130551188/7568278.pdf
    • http://bolksteinanderson.com/uploads/1/3/0/4/130491488/wufeditikerewaf.pdf
    • http://www.macshackatl.com/uploads/1/3/0/3/130323818/parawoj.pdf
    • http://gimnasiagerencial.com/uploads/1/3/0/5/130540209/davaxiwikuwagakonata.pdf
    • http://shorelineairport.com/uploads/1/3/0/8/130874588/76ed424b2.pdf
    • http://living-practically.com/uploads/1/3/0/8/130814576/a58c65dc9327be8.pdf
    • http://www.newjerseyindustrial.com/uploads/1/3/0/6/130621998/koxerowozij.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_off0000551b.bin
f1de54c8ba1571e0e74abeb5292ec415f6c89d41c6ce63996f28e82b9d5ccde5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x551B 8240 bytes

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