Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d485b53aef3b332…

MALICIOUS

PDF

74.4 KB Created: 2021-02-23 05:08:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 426423e9e066697441e1db70b3e60e9a SHA-1: 5ac732e7b07ed316ff9af803cf6d28d39ea80450 SHA-256: 2d485b53aef3b3323007b2c3c6f177a4374cfa3f4f84cc97ca1afa8c69e22159
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one prominent URL pointing to 'bologen.ru', suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://bologen.ru/123?utm_term=what+comes+after+3%252F16 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491671/normal_5fd8bc87e2a82.pdfIn PDF document text
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/kevezapeki_gevoxedadoni_zakifomikudaxuj_zewox.pdfIn PDF document text
    • http://silkhfig.bid/worst_superhero_fight_sceneslyt0p.pdfIn PDF document text
    • https://jupawipomilat.weebly.com/uploads/1/3/2/7/132741176/6042075.pdfIn PDF document text
    • https://tojabefe.weebly.com/uploads/1/3/2/3/132303019/nepojutura.pdfIn PDF document text
    • https://dubuweni.weebly.com/uploads/1/3/1/6/131637072/gutudebeposufakekim.pdfIn PDF document text
    • https://vajunepiw.weebly.com/uploads/1/3/2/6/132681590/ffb03bc0f802fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446497/normal_601dd9e82f63b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386361/normal_60134540157e7.pdfIn PDF document text
    • http://paypallsecurity.com/zawopamosexibemilhvyxp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406208/normal_5fdb0f42df64a.pdfIn PDF document text
    • http://dreabling.online/ielts_speaking_task_2_samplesd4az3.pdfIn PDF document text
    • http://voicebftyi.com/athens_tech_nursing_intent_formglzss.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377095/normal_602da9659abaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427077/normal_60100c2123bd9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393035/normal_5feb2f84486a2.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/gagotaniwipure/hodder_cambridge_primary_maths_stage_4.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/generos_periodisticos_informativos_definicion.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/barragens_de_rejeitos_no_brasil.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/property_development_manager_cv_template.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_off0000e383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE383 5508 bytes
SHA-256: 88c5d7f80f1572a066468aad62d791a11a6555afe2bd3d5d42ab3625ee6ae3e1
font_01_sfnt_off0000f629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF629 11248 bytes
SHA-256: 01d3da156df64a38385bd97339d8d3946f57569cb661dc7864437e265aa86ba2

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