Malicious PDF — malware analysis report

Static analysis result for SHA-256 374163d530ae0359…

MALICIOUS

PDF

52.9 KB Created: 2020-04-16 13:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c9a3d09382c58eb5222c2a0f2df4e0e9 SHA-1: be5f8c8385924807e6ed366349e4e35d1cdb39a8 SHA-256: 374163d530ae03597a32df2be7a4a35d0e48b4d8187273b7e88cf9ac74fcd94c
94 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier with high confidence. It contains a large number of external links, many of which point to similarly structured URLs on different domains, suggesting a link farm or SEO abuse tactic. One of the embedded URIs is http://halefamilyrealestate.org/uploads/1/3/0/4/130477490/130477490.html#castlevania+dracula+x. The document body contains garbled text and references to 'Castlevania dracula x' and the wkhtmltopdf application, which is often used to generate PDFs from HTML, potentially for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://halefamilyrealestate.org/uploads/1/3/0/4/130477490/130477490.html#castlevania+dracula+x
    • http://theskinnhaven.com/uploads/1/3/0/7/130775456/dupamebeb.pdf
    • http://wearemindnmusic.com/uploads/1/3/0/6/130620437/182b0982a.pdf
    • http://ch-ck.co/uploads/1/3/0/6/130621026/d9e290.pdf
    • http://flaminggnomestudios.com/uploads/1/3/0/3/130323271/f9cfd53d.pdf
    • http://dreamcatcherfishingtours.com/uploads/1/3/0/8/130874389/jezewigazugadi.pdf
    • http://sheffield-telephone-engineers.com/uploads/1/3/0/2/130272557/lazijon_jufaxa.pdf
    • http://jrosefeidnerphotography.com/uploads/1/3/1/4/131454216/5531506.pdf
    • http://silvercreekoutdoorexpo.com/uploads/1/3/1/6/131637691/922791.pdf
    • http://silvercreekoutdoorexpo.com/uploads/1/3/1/6/131637691/9
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000646f.bin
7d89d9ae013a32e663a8fe65a8a4750bc9c8de2d34542916bf7efbc3e96555b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x646F 7724 bytes
font_01_sfnt_off00008295.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8295 2652 bytes
font_02_sfnt_off00008bd2.bin
f07af44bcda440121d90f51cda722af8ed88395284cc6a9692b984200d3f2d63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD2 18600 bytes

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