Malicious PDF — malware analysis report

Static analysis result for SHA-256 873207cdd88a8452…

MALICIOUS

PDF

105.5 KB Created: 2021-06-05 03:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e905b76c2ef7feb8498af79fca4998da SHA-1: 2718e06de86d66c510918e1fb70f845c478a2293 SHA-256: 873207cdd88a84528d3380f5ff0f29b8dc14ac5d366bc0d6f598e6c2c33851c9
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting it is part of a link farm designed to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive link farm heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://coretry.ru/pbw?utm_term=tabela+de+%25C3%25ADndice+glic%25C3%25A9mico+dos+alimentos+portugal PDF link annotation
    • https://dajixogemozuv.weebly.com/uploads/1/3/1/4/131438707/02ab196.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385848/normal_6056f8964dbbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379615/normal_60662755150e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484814/normal_606b54af61f4f.pdfIn PDF document text
    • https://daxefumusadaja.weebly.com/uploads/1/3/4/7/134763928/024d2719e034746.pdfIn PDF document text
    • https://zemejinifuv.weebly.com/uploads/1/3/4/5/134577925/motilawilap-vodatilabe-deweb.pdfIn PDF document text
    • https://dowabibagugodu.weebly.com/uploads/1/3/4/6/134697665/zudulazubo.pdfIn PDF document text
    • https://sukopowe.weebly.com/uploads/1/3/4/4/134499194/1a68e7be75ed3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449183/normal_602473d1a0dff.pdfIn PDF document text
    • https://fedofiri.weebly.com/uploads/1/3/2/6/132681193/4907974.pdfIn PDF document text
    • https://ralirepiputup.weebly.com/uploads/1/3/4/8/134852471/naxixaju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4c3197a6-1334-49f1-8642-64f90077c2c1/xinujubuzu.pdfIn PDF document text
    • http://barumena.pbworks.com/f/how_to_download_microsoft_powerpoint_2016_in_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e45a979-f291-40f3-b0bb-6cdf200ade42/cva_wolf_209_for_sale.pdfIn PDF document text
    • http://mupalunava.pbworks.com/w/file/fetch/144492711/the_great_depression_commonlit_answers.pdfIn PDF document text
    • http://dewubuk.pbworks.com/w/file/fetch/144422889/52060642698.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/566af65e-b414-4ae6-a849-94626620bc0c/gafesinusorolekelekebaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35800aad-e125-4078-a4d4-d683d96aed9f/45945588007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9727474a-f5f2-4f63-bd0b-f62afb3f7fd8/pmdg_747-8_crack_p3dv4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab9a012c-876b-4232-adac-23f61aa57532/dan_brown_robert_langdon_reading_order.pdfIn PDF document text
    • http://sagidetubi.pbworks.com/w/file/fetch/144623289/vomanezutowalonu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e89fb1c2-a84e-43d3-8b36-da48cc962266/37369312595.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14608 5560 bytes
SHA-256: e9833dac048d70bf8ffd4d086ae37d2a45bcbaccdfce8dbc2a23a34a52adf094
font_01_sfnt_off00015882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15882 16128 bytes
SHA-256: b1c56fd1178bbbb849e8343b4085c68da04547e997d5b283c5cd2cfab5ca1223
font_02_sfnt_off000187c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187C2 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378