Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcdd48df8585c268…

MALICIOUS

PDF

36.8 KB Created: 2020-04-06 05:40:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fd6df5852c0b8d3991b65d55ce2a412a SHA-1: bc9e2a60c1750d543f216d0a0a014bdac458fe47 SHA-256: bcdd48df8585c268e33769993967e41c7dd3f8431464dacbb0d352ff46b5ea51
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various domains, characteristic of a link farm or SEO abuse. The ML classifier strongly flagged this PDF as malicious. The primary intent appears to be directing users to a network of potentially malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://embodiedleaderpath.com/uploads/1/3/0/7/130738644/130738644.html#forward+chaining+vs+backward+chaining+in+pega
    • http://crazysnails.com/uploads/1/3/0/2/130289669/zepanexarasujumub.pdf
    • http://wendywangauthor.com/uploads/1/3/0/4/130489172/buroropaxazupo.pdf
    • http://interculturalwork.com/uploads/1/3/0/5/130588570/4311075.pdf
    • http://birobiewergolddustclub.org/uploads/1/3/0/7/130775111/3f570cd523e8b.pdf
    • http://meanttoment.com/uploads/1/3/1/4/131437554/jamiserukum-gonetunit-xuwasimo.pdf
    • http://thebuttertarts.com/uploads/1/3/0/5/130543418/kuzas-fogeg.pdf
    • http://amateureventingblog.com/uploads/1/3/0/7/130774965/dozowafadak.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_off000067b5.bin
41d6d55147e760f5556ea1595d5998787d73124d9248e61efeec93889a189f49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B5 7884 bytes

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