Malicious PDF — malware analysis report

Static analysis result for SHA-256 253d029b157601dd…

MALICIOUS

PDF

80.8 KB Created: 2021-06-07 19:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a2aa746dc0e2dee9ac6497126d8a7340 SHA-1: 68a1c407d764873c6b51ba4438b52eabeecae959 SHA-256: 253d029b157601dd092d103ac83421a3441aac7dfe37bb9d4a318750dd4d9c56
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and a malicious phishing document. The embedded URLs and the document's structure suggest it is designed to redirect users to external websites, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://medvor.ru/pbw?utm_term=convertir+pdf+a+word+archivos+grandes+gratis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380079/normal_6029a9ae2f952.pdfIn PDF document text
    • https://fojalexademu.weebly.com/uploads/1/3/4/8/134890314/6659556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477183/normal_5fda5e7df1562.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495395/normal_6038b956dade7.pdfIn PDF document text
    • https://visosoduvevup.weebly.com/uploads/1/3/4/2/134234588/c73635d5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452382/normal_602474faa35f5.pdfIn PDF document text
    • https://rowumojonudelaz.weebly.com/uploads/1/3/4/3/134335227/waveliwolata-motobi-suzamava-pinojata.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418973/normal_601470c7a3c1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451047/normal_601b98c710ebc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415951/normal_6039c08c3fbdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452171/normal_60519d3ccada2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473056/normal_5fcc7dfe6d469.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4370560/normal_60b3b5bd436b8.pdfIn PDF document text
    • https://gexoronigiz.weebly.com/uploads/1/3/4/2/134265935/vetawilages.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
    • http://bovojigu.pbworks.com/f/does_asta_turn_full_demon.pdfIn PDF document text
    • http://tojasakamu.pbworks.com/f/sas_interview_questions_for_banking_domain.pdfIn PDF document text
    • http://dijakezepo.pbworks.com/w/file/fetch/144469779/ponn_conquest_hose_friction_loss_chart.pdfIn PDF document text
    • http://zuwofig.pbworks.com/f/ribewekuferudakam.pdfIn PDF document text
    • http://fatakalewene.pbworks.com/f/pubg_hack_for_rooted_device_2020.pdfIn PDF document text
    • http://gibuwodebu.pbworks.com/f/79914149605.pdfIn PDF document text
    • http://dupalalo.pbworks.com/w/file/fetch/144780432/folopamomobebodipan.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_off0000edb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB8 5348 bytes
SHA-256: 7fb7c233469d983ab659d7acd05fc6bfed5feb76981f00c46178683560e34b2d
font_01_sfnt_off0000fff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF6 11584 bytes
SHA-256: 48229c7ff9dabe058d343adcc8ea1161dbaeb64a9e92e772683041622c9c75a9
font_02_sfnt_off000125b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B4 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3