Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf26c12981d071d6…

MALICIOUS

PDF

48.8 KB Created: 2020-11-09 02:02:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d1ea0bbfdb0ee4bcbc21911aa0fbd567 SHA-1: dbd36d006770379353dbf84c1a0a9ce22cf5eaa9 SHA-256: cf26c12981d071d6e2a5e38b5c884bf0fae3a112a366d3363778f8a6f00634ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://trafffi.ru/123?keyword=mother+teresa+speech+on+abortion PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385020/normal_5f901e51e24b1.pdfIn PDF document text
    • https://juzomewe.weebly.com/uploads/1/3/4/3/134350864/xidinimaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384469/normal_5f9e12a8ce27f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447276/normal_5fa0abfca4a8a.pdfIn PDF document text
    • https://gejosabuvin.weebly.com/uploads/1/3/4/4/134457948/riwazatoze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403283/normal_5fa4247899d22.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/25242019011.pdfIn PDF document text
    • https://suvarofora.files.wordpress.com/2020/11/95519257918.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/carnaval_rio_de_janeiro_2020_dates.pdfIn PDF document text
    • https://zilexir.files.wordpress.com/2020/11/2804562883.pdfIn PDF document text
    • https://zetetojowu.files.wordpress.com/2020/11/xamemofejimibig.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/bijafavu.pdfIn PDF document text
    • https://jaxeliniz.files.wordpress.com/2020/11/lawadupuxofibape.pdfIn PDF document text
    • https://botebofeji.files.wordpress.com/2020/11/15963812645.pdfIn PDF document text
    • https://firomikodow.files.wordpress.com/2020/11/michelle_cunningham_online.pdfIn PDF document text
    • https://paseneg.files.wordpress.com/2020/11/imprimer_etiquettes_dossiers_suspend.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/definition_of_demigender.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_off00007a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A21 5132 bytes
SHA-256: ea59f6ff59ad76e0d646995fefa19199fb471fa396bfe2f62d26403080c8f23c
font_01_sfnt_off00008b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B95 14736 bytes
SHA-256: 2bc3881283ed5b81f9f4cc79f5c61a2c760d07539d8010c34d885e2f5de8cc77