Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ce66680296beb6c…

MALICIOUS

PDF

29.2 KB Created: 2020-05-17 01:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: 381f1a9859aa7e7b6dff614fb597bb19 SHA-1: 73a558f4ed86ed43539ecbb352b7caa77cba4573 SHA-256: 6ce66680296beb6c42c6884f5b1e5d6211127ef2df880e9f5edf60318595c0ba
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. While no scripts were directly extracted, the PDF structure and the sheer volume of external links suggest a malicious intent to redirect users. The ML classifier strongly supports this assessment.

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://thesweetmission.com/uploads/1/3/1/4/131454762/131454762.html#bootstrap+html+template+basic PDF link annotation
    • http://wetmarket.net/uploads/1/3/1/6/131636677/9345727.pdfIn PDF document text
    • http://connecticutflyboard.com/uploads/1/3/0/5/130588571/fejabi.pdfIn PDF document text
    • http://legacycaengineering.com/uploads/1/3/0/6/130640044/6884186.pdfIn PDF document text
    • http://motionfuels-arkansas.com/uploads/1/3/1/6/131636862/5511792.pdfIn PDF document text
    • http://clgoods.com/uploads/1/3/0/8/130814083/2bcd1ac5909.pdfIn PDF document text
    • http://ascinsurescaffoldtoolbox.com/uploads/1/3/0/4/130491932/jumuz.pdfIn PDF document text
    • http://expertagentideas.com/uploads/1/3/0/3/130379315/1050404.pdfIn PDF document text
    • http://mobilefooter.org/uploads/1/3/0/4/130483393/67431a9.pdfIn PDF document text
    • http://karsanstash.com/uploads/1/3/0/5/130541944/c484931025fe.pdfIn PDF document text
    • http://rugcleanerspro.com/uploads/1/3/0/7/130739983/8756065.pdfIn PDF document text
    • http://tektronicusa.net/uploads/1/3/1/3/131380992/804694.pdfIn PDF document text
    • http://docbwell.com/uploads/1/3/0/4/130477363/956aa2d5d.pdfIn PDF document text
    • http://shabbydabbsdesign.org/uploads/1/3/0/4/130489467/f8ec62a42.pdfIn PDF document text
    • http://dananpowellrealestateteam.com/uploads/1/3/0/5/130588393/kidapu_wizazig_memugelego_zixabebufimada.pdfIn PDF document text
    • http://yourcareercollaborator.com/uploads/1/3/0/3/130323403/tasetil.pdfIn PDF document text
    • http://quantensprung.info/uploads/1/3/0/7/130776659/28c0a849559e.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000049fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49FB 9232 bytes
SHA-256: b2656c11592ec81bc7c7dc06f2934b61a3f5500bbed563461eafee8338bf97fc

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