Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bcb7eee837cde68…

MALICIOUS

PDF

88.3 KB Created: 2021-03-18 04:22:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0ed920572b763d7264adaef8be605a2d SHA-1: 6f88efebf9ae7b8cff68c5807df08fbba8e10354 SHA-256: 7bcb7eee837cde68c335ba998be28fb0465541167d6ef7120a2011f58ba50610
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with several pointing to disposable hosting domains and employing UTM parameters, suggesting a phishing or scam campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm designed for SEO manipulation or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/123?utm_term=tesis+amenaza+de+parto+pretermino+pdf PDF link annotation
    • http://sexefowox.22web.org/7234151704.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387821/normal_5fcf14a09e766.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_601964e41801e.pdfIn PDF document text
    • http://zipogagu.iblogger.org/ultrasound_guided_subacromial_bursa_injection.pdfIn PDF document text
    • https://lepuzabokagat.weebly.com/uploads/1/3/4/3/134333079/7e973461bd19d89.pdfIn PDF document text
    • https://fotijaxak.weebly.com/uploads/1/3/4/1/134108731/8268006.pdfIn PDF document text
    • http://savupubib.22web.org/candide_voltaire_francais.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454545/normal_601d96b2a7e02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420927/normal_601b2ebe75560.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378605/normal_5fee515b9a449.pdfIn PDF document text
    • https://barobinamad.weebly.com/uploads/1/3/4/7/134756413/vinomororatako.pdfIn PDF document text
    • https://koxipaburejoxow.weebly.com/uploads/1/3/2/6/132681725/newarixekedatorin.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/sogovekevi/how_to_get_bff_charm_on_snapchat.pdfIn PDF document text
    • http://vusatalejud.epizy.com/tabla_de_conversion_puntaje_psu_matematicas.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/92302639525.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/avast_offline_full.pdfIn PDF document text
    • http://pigadupujegojum.rf.gd/75131712043.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/instrumental_trap_type_beat.pdfIn PDF document text
    • http://zotijoxamofos.epizy.com/fapovorexilozazufidaxeb.pdfIn PDF document text
    • http://wugadavax.epizy.com/basicity_definition.pdfIn PDF document text
    • http://wipupagajefi.rf.gd/81599870485.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_off0001177c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177C 5156 bytes
SHA-256: 011deee6c0e35866d2ac9abae7af54e398505767fdbede68dd427c73eea52305
font_01_sfnt_off000128f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F5 13052 bytes
SHA-256: e07c721b662d75ee9deb7eee9df3f0708ecdfcad1b895394ef37792fc4ff0c61

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