Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a2e60b85b4120d1…

MALICIOUS

PDF

63.7 KB Created: 2020-11-18 22:50:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5e587f28ab644e80c9cd19a0749bfcd3 SHA-1: 99632fdae884d66becb5a6ebdbc2d8d33a4ae30e SHA-256: 6a2e60b85b4120d16afa476703ad2be08e6b307a1299c6a52dcb25db9c4f0830
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards techniques used in phishing and malicious redirection schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=exercice+de+ponctuation+ce2 PDF link annotation
    • https://radigaligoled.weebly.com/uploads/1/3/4/3/134333621/sitobalimob-vewivew-pugaz-vopadu.pdfIn PDF document text
    • https://winapusumebut.weebly.com/uploads/1/3/4/6/134695108/lezixizujiviton.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470523/normal_5faa837f898d0.pdfIn PDF document text
    • https://sisodiwitamusoz.weebly.com/uploads/1/3/2/6/132681746/5090826.pdfIn PDF document text
    • https://zatafepe.weebly.com/uploads/1/3/4/0/134000007/045f1d989469.pdfIn PDF document text
    • https://tupipukevoluda.weebly.com/uploads/1/3/4/0/134041298/tesibo-pubidovasozow.pdfIn PDF document text
    • https://vukumurumijolot.weebly.com/uploads/1/3/4/4/134433046/goroxivaxuzuv.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/lorifawuvawot/peppermoths_weebly_answers_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9191ef4-b089-4325-9b49-d2e3acb48fe8/96546506299.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/multivariate_data_analysis_a_global_perspective.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/examples_of_an_annotated_bibliography_ama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f3dc394-f20b-403c-948a-4008d7fa7eed/77626086115.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_off0000b957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB957 5012 bytes
SHA-256: c2ca0358100e2e84a1cf6b93d29d47227d89ad6af60d2adad035e36e0739bee5
font_01_sfnt_off0000ca7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7B 12124 bytes
SHA-256: ff10c07dbef07fb3551d8e625a0d62afdd72cfad9c0dc1d0aba0833ce338c420