Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae3238c4fc09707…

MALICIOUS

PDF

39.5 KB Created: 2020-03-22 05:12:13 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 14d05c1c5d647f5c1a4264c7b0490c77 SHA-1: fbcba9bd08ba9f0dcc8bf2951fa6d0887a6ede6d SHA-256: 5ae3238c4fc09707cfeee523332169609a59fdef6f3c13f48c512cb5a997ef01
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, pointing to various domains. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to redirect users to potentially harmful content or for SEO manipulation. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://strigiformae.net/uploads/1/3/0/5/130551653/130551653.html#caperucita+roja+cuento+infantil+con+imagenes
    • http://music4am.com/uploads/1/3/0/6/130620613/d0f92e91b.pdf
    • http://deblokletter.be/uploads/1/3/0/6/130639580/5823758.pdf
    • http://readingthegame.org/uploads/1/3/0/8/130874648/zogew_disotiriberune_muwedefaruvedi_zafabiziseram.pdf
    • http://stevecoltrain.com/uploads/1/3/0/6/130621277/wogorulivoduwakupus.pdf
    • http://davezajac.com/uploads/1/3/0/6/130621045/9e670ddce5af6b.pdf
    • http://spartanragelife.com/uploads/1/3/0/6/130639409/vulor.pdf
    • http://northolmesjuniorschool.com/uploads/1/3/0/7/130775012/kixesapow.pdf
    • http://74-123-77-9.mgwnet.com/uploads/1/3/1/0/131071167/7cec8b2.pdf
    • http://ministrypartnersfunding.net/uploads/1/3/0/5/130538816/4916267.pdf
    • http://siegmancreative.com/uploads/1/3/0/6/130621784/3823966.pdf
    • http://www.bagleyallschoolreunion2019.com/uploads/1/3/0/4/130483772/mexafeges.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_off00006f88.bin
17c95854f0845c1c2a112781bd6492702a393e3cd58d1d71f30ce2585d5652e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F88 8748 bytes

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