Malicious PDF — malware analysis report

Static analysis result for SHA-256 6661850247f8178f…

MALICIOUS

PDF

42.0 KB Created: 2020-04-17 03:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6a22a3dcc2bf0c0557f438ee02e03dfe SHA-1: 6b76b143ce71b9b05364d00f47bd7483ae7c9324 SHA-256: 6661850247f8178fc60092e1fdae47f61e4292b740ed1b25f5462ba0965e97aa
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to domains structured for SEO link farming, suggesting a malicious intent to redirect users. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a mailing label template. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious document designed to distribute further content.

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://1890joyridgeroad.com/uploads/1/3/0/6/130639443/130639443.html#mailing+label+template+for+google+docs
    • http://instakimbakti.info/uploads/1/3/1/1/131163787/65e0850.pdf
    • http://reclaimyourhealth.info/uploads/1/3/0/7/130775443/8536751.pdf
    • http://abundanceinabox.com/uploads/1/3/1/3/131383480/a9cfbd6e2e296.pdf
    • http://jc-mixology.com/uploads/1/3/0/7/130739713/voviw.pdf
    • http://en-bici.com/uploads/1/3/0/2/130289521/4483194.pdf
    • http://inspireinet.com/uploads/1/3/0/5/130543598/7fc4da728923cf.pdf
    • http://rootsdesignco.com/uploads/1/3/1/4/131438848/2379597.pdf
    • http://pcolegal.net/uploads/1/3/0/6/130639462/a75c8e1.pdf
    • http://endurancevc.us/uploads/1/3/0/5/130539287/dumopemar.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_off00007bf0.bin
ef1357e28eebe7b68794f53233856d4eaadfb8ca2a067d9e7500615ffbf7aa46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF0 7760 bytes

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