Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09ec64ba38644eb…

MALICIOUS

PDF

73.3 KB Created: 2021-02-16 00:48:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 52b4b8130e20eac949092a6bc3b45fc0 SHA-1: 26062fe5ea338bdb5b7435c0896b0e52c62f4f51 SHA-256: b09ec64ba38644eb7a55aab9103b12ac473c204413e16b87c76f905b6ecc72fd
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ML classifier strongly indicates maliciousness. The primary purpose appears to be directing users to a network of external websites, likely for SEO manipulation or to host further malicious content. No scripts were extracted, but the PDF structure and numerous URLs suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 https://druttle.ru/123?utm_term=la+esposa+que+ora+d%25C3%25ADa+12 PDF link annotation
    • https://verulezame.weebly.com/uploads/1/3/0/8/130814285/1242244.pdfIn PDF document text
    • https://ziropiwos.weebly.com/uploads/1/3/4/3/134311351/790d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426810/normal_5fc5ed577c4f0.pdfIn PDF document text
    • https://fijogukovope.weebly.com/uploads/1/3/1/3/131379832/banerurixu_vopajutanoxu_lonel_gizenoripijunox.pdfIn PDF document text
    • https://munuteme.weebly.com/uploads/1/3/4/8/134862418/3fcc0ace8ed.pdfIn PDF document text
    • https://zubisixoligifi.weebly.com/uploads/1/3/4/4/134479514/lunosumoxeku_mapoxuj.pdfIn PDF document text
    • https://nadagedo.weebly.com/uploads/1/3/1/8/131858166/nufen_dolukefo_sidobinozugewob_bezasisozonolib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373522/normal_5fd93c35af688.pdfIn PDF document text
    • https://patoxudiza.weebly.com/uploads/1/3/0/7/130739147/fedopurojuw.pdfIn PDF document text
    • https://sovajavab.weebly.com/uploads/1/3/4/0/134041947/7763772.pdfIn PDF document text
    • https://jimivisimobud.weebly.com/uploads/1/3/4/9/134901817/9955671.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372682/normal_5ff2671d1a471.pdfIn PDF document text
    • https://bitiwinelezom.weebly.com/uploads/1/3/1/8/131856531/vonejelezoji-nagilowoxod.pdfIn PDF document text
    • https://vakogiguwowokel.weebly.com/uploads/1/3/0/7/130775334/wilugulatilave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380857/normal_60112845431d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fugebuxojawuris.epizy.com/sql_server_2008_r2_rtm_enterprise.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02A 5224 bytes
SHA-256: e4f9c9bddc1a1f60316866d9c9a4a442970c8f1552719c0a063c196667cb8427
font_01_sfnt_off0000f206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF206 11216 bytes
SHA-256: d49893f2b13d5f7b638d456337c6c59353562c1b89f0a3e28fc8fd407b1fab46

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