Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e9d639236bf62f4…

MALICIOUS

PDF

67.0 KB Created: 2021-04-16 05:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 42b4c4a9c060afbe61402bc68a22c6dc SHA-1: c18202d7db7651a532e014ffd693056d02e61716 SHA-256: 1e9d639236bf62f4afdba90659ce64db42ecfd6f409c99265d542ab257e19fdb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The PDF contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing attempt. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://lozipotod.ru/strik?utm_term=are+options+good+for+day+trading PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449602/normal_6000a170233b9.pdfIn PDF document text
    • http://nanutoz.22web.org/sabezom.pdfIn PDF document text
    • https://diwuxofemuji.weebly.com/uploads/1/3/1/4/131407179/tuwik.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/zZOyEji/project_management_certification_costa_rica.pdfIn PDF document text
    • https://cdn.sqhk.co/modonasuje/fhgggg9/coin_drop_machine_game.pdfIn PDF document text
    • https://lodunuvivilaz.weebly.com/uploads/1/3/0/7/130775731/5974085.pdfIn PDF document text
    • http://pumujavebedopa.iblogger.org/mupiriduzelezowunid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450039/normal_603122824850d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403680/normal_6045febea5bf9.pdfIn PDF document text
    • https://cdn.sqhk.co/sugefixa/gaKNbdu/vobegux.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/YEjdlal/energy_blaster_neopets.pdfIn PDF document text
    • http://darusupula.22web.org/the_passage_justin_cronin_movie.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/39d71ad1-080e-4591-86d1-c84359293969/foxumitok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc9bdde9-2dd0-4ad3-b068-b9327de96aaa/cursos_de_ingles_en_houston_economicos.pdfIn PDF document text
    • http://rovafitazilom.epizy.com/enquiry_letter_in_business_communication.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/51653214071.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/tizovebogogapotaxaxer.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_off0000ca19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA19 5268 bytes
SHA-256: 979bc954d9b637b15969b617bcb6ef4e430b6ab9c6080c7666bdde2c468082a4
font_01_sfnt_off0000dc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1F 10212 bytes
SHA-256: a189197a2008c43f9f53a53faf7a11295f482018dd5be4f0024cefbe9b4fc8e5

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