Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e912351da8cb3e…

MALICIOUS

PDF

34.2 KB Created: 2020-04-12 13:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f5d2b924f9147d3d3a09d295d7285128 SHA-1: 0246b1676d15c5d8745205533f0257e213fff0d8 SHA-256: c4e912351da8cb3e83d8b8eed226e309e0a18c8a8f6d730220fb01781ae2d605
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF file contains a large number of external links, many of which point to other PDF files with numeric slugs, indicative of a link farm or SEO spamming technique. The ML classifier strongly flagged this PDF as malicious. The embedded URLs suggest a redirection or hosting mechanism for further malicious activity, potentially leading to credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://flametreecommunications.com/uploads/1/3/0/7/130775654/130775654.html#como+se+hacen+las+graficas+de+ojiva
    • http://sparksphilippines.com/uploads/1/3/1/3/131378970/a2bbfb180a.pdf
    • http://landclearingcollegestation.com/uploads/1/3/0/3/130313316/xamav.pdf
    • http://primeamazon.org/uploads/1/3/1/3/131398024/8694163.pdf
    • http://premierbrokersrealestate.com/uploads/1/3/0/7/130738697/vinuvejidozaw.pdf
    • http://awakentampabay.com/uploads/1/3/0/8/130813447/6117080.pdf
    • http://michellemahnke.com/uploads/1/3/0/5/130588702/xutuxilalipibi.pdf
    • http://plact.org/uploads/1/3/0/9/130969191/afc8a2983.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_off00005af5.bin
69cc4e7e9f34006f4b56169abd53acc10b5b3d7c9be49ad33260f75ef18586dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF5 8980 bytes

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