Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d6be741795309e…

MALICIOUS

PDF

78.1 KB Created: 2021-04-06 10:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5b7b4f42af365de0a370d540aba5a31e SHA-1: d9eb1ded602b75d2fc7d9d3658ab1a69bf309edd SHA-256: a3d6be741795309e1a2d37249746e2111f6e05398c75df63f1a7e29b2cde92e7
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The embedded URLs suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://botokaw.ru/strik?utm_term=a+christmas+carol+fx+schedule PDF link annotation
    • http://tizadejaso.getenjoyment.net/world_history_final_exam_multiple_choice.pdfIn PDF document text
    • http://tuzojexis.mypressonline.com/cursos_para_aprender_hablar_ingles_gratis_por_internet.pdfIn PDF document text
    • http://mimisijuz.mypressonline.com/60335442623.pdfIn PDF document text
    • http://dusamoka.mywebcommunity.org/assurance_maladie_universelle_en_cote_d_ivoire.pdfIn PDF document text
    • http://gajaxujifusokul.mygamesonline.org/annuity_guide.pdfIn PDF document text
    • http://ladujose.sportsontheweb.net/duxutilesu.pdfIn PDF document text
    • http://pojebanidik.mywebcommunity.org/academy_xperts_mikrotik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_d43b071d86a44095be6bfd3224f1bb4a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/733b8098-31ae-4d20-97c6-f3393386decd/rutuvewizedipezuwom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/821c71ca-f6ab-4f12-a142-00fbbe6cc1cf/physics_fundamentals_worksheet_conservation_of_momentum_answers.pdfIn PDF document text
    • https://4fcc26ae-a476-48f2-98aa-cdc5c12f4544.filesusr.com/ugd/32d0e1_34d2b7d3310d416798c4b10eef0bf27e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4292cd7-e69e-48d7-a4eb-4c11b6be137f/tipos_de_planes_netflix_mexico.pdfIn PDF document text
    • http://koxolavomuzo.myartsonline.com/chandra_prakashan_assam_tet_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/534f4ab1-fb7b-41a1-a1de-f4f531e9b423/army_combatives_level_1_handbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af58c1a7-6cda-47c5-9267-d0bf62e52079/tirowutemovop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5390b8c0-e6c0-436f-a407-f6f362683d88/36344040847.pdfIn PDF document text
    • http://domebiwek.myartsonline.com/fuzarivekutox.pdfIn PDF document text
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_6d052c4e73b1485cb1b1dce88df1b9f6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf9bd671-b62f-4326-963a-5a06c736fc52/excel_spreadsheet_templates_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96c8fb92-218b-408d-85ae-8759ee2906a9/godedanuvonu.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_off0000f1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B0 5320 bytes
SHA-256: f8cfb25dadd349eba66f307a13ee20ac88c4483d9c95c911e68de7aee7c01c50
font_01_sfnt_off000103a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A0 11184 bytes
SHA-256: 3dd5ab49d9469aea2766689e97e196686039cbde750c49bc1ae713f287aa26d9