Malicious PDF — malware analysis report

Static analysis result for SHA-256 780ae10c52a86b29…

MALICIOUS

PDF

69.9 KB Created: 2020-04-01 19:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-04
MD5: 58172536d726c7da583e114af0489eab SHA-1: 73e4df21a774c62063fd6b8902177387589811cb SHA-256: 780ae10c52a86b2936262ac2786c22263332bd79297192fc082551e23f468271
96 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous external URLs embedded within its structure. The ML classifier strongly indicates maliciousness, and the presence of a large number of external links suggests an attempt to direct users to potentially harmful content or phishing sites. The document body, though heavily obfuscated, contains a URL that mirrors one of the embedded links, reinforcing the attack pattern.

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://bluestonewinery.com/uploads/1/3/1/3/131384771/131384771.html#asp.net+core+3.0+web+api+tutorial+for+beginners PDF link annotation
    • http://kristajana.com/uploads/1/3/0/9/130970003/ac1a0f0aa5.pdfIn PDF document text
    • http://griderfamily.net/uploads/1/3/0/4/130491594/48f837031.pdfIn PDF document text
    • http://journeyisthepath.com/uploads/1/3/0/4/130435771/b9f38782d724f32.pdfIn PDF document text
    • http://greenlifelawncare.net/uploads/1/3/0/6/130640104/wojava.pdfIn PDF document text
    • http://keren-s.com/uploads/1/3/0/6/130621228/3635929.pdfIn PDF document text
    • http://newhomeswithashley.com/uploads/1/3/0/6/130639706/4176950.pdfIn PDF document text
    • http://blingafied.com/uploads/1/3/0/2/130272388/wobamuwufi-sazelazamojurud-sulagabigifo.pdfIn PDF document text
    • http://premiumprocessing.net/uploads/1/3/0/3/130324112/d957892.pdfIn PDF document text
    • http://tienichnho.net/uploads/1/3/0/7/130776066/6198457.pdfIn PDF document text
    • http://thefongs.net/uploads/1/3/0/6/130620694/3471281.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text
🗂 Part of campaign: hamiltonsystemsintegration.com 4 samples

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB59 9592 bytes
SHA-256: e9c3f5983e01308ad156b990970979606b8529e7dda09d73d826cbbf5654ddcd
font_01_sfnt_off0000ffdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDC 2652 bytes
SHA-256: e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea