Malicious PDF — malware analysis report

Static analysis result for SHA-256 6636f1905862bdef…

MALICIOUS

PDF

65.4 KB Created: 2020-04-12 02:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4588bded4361b4453cfc1a3fc6c6113f SHA-1: 6e566b70c6dca4f9506958e9fc15ffccde3864a1 SHA-256: 6636f1905862bdefe98d0a924d3659e1c31a84eec158ef4ec54579ca4956862f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded external links, many of which point to similarly structured URLs. This pattern is indicative of a link farm or a mechanism to distribute malicious content or phishing lures. While no scripts were directly extracted, the PDF_SEO_LINK_FARM heuristic and the sheer volume of suspicious URLs suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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://shine-bu.com/uploads/1/3/0/9/130969429/130969429.html#caracteristicas+del+modelo+economico+crecimiento+acelerado+en+mexico
    • http://elegantcreations.net/uploads/1/3/0/2/130288453/kosezegikab-mebuw-kolinexuk.pdf
    • http://enhancinglivesbobmas.com/uploads/1/3/0/8/130814642/12ec59f578e0.pdf
    • http://idstatement.com/uploads/1/3/0/7/130776865/5735531.pdf
    • http://christinatrutiak.com/uploads/1/3/0/3/130313149/8481365.pdf
    • http://releasecurve.com/uploads/1/3/0/6/130604036/bopokez_finupedapeworu_xenen.pdf
    • http://cantonbiblechurch.net/uploads/1/3/1/4/131453208/5b5075b8f.pdf
    • http://onboardforacure.com/uploads/1/3/0/8/130814874/1509323.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb50.bin
2f7ea1067fef269fd46b3f5031880a0b14fa694fe5c99ab053c2b74e094691bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB50 2104 bytes
font_01_sfnt_off0000d4d0.bin
6501e6d2f9bcd1e8316c98a96921766e53661719733128da2f29e74d659b678d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D0 9668 bytes

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