Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5a7d25f611d9dc…

MALICIOUS

PDF

111.8 KB Created: 2021-04-16 14:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fa6acbe54fed8b612971b8ecff2feb2b SHA-1: 638790232e56b64e0a1ed7a70d518f7609152658 SHA-256: 2a5a7d25f611d9dc56fcdb26659df8a7eba3b4557b517d66275c03010cf32b0a
186 Risk Score

Malware Insights

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

The PDF file contains a link farm designed to redirect users to potentially malicious websites, disguised as a search result for 'Burger King breakfast menu uk 2020'. The presence of numerous external links and the ML classifier's high confidence score indicate a phishing or malware distribution attempt. Although no scripts were directly extracted, the PDF structure and embedded URLs strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=burger+king+breakfast+menu+uk+2020 PDF link annotation
    • https://cdn.sqhk.co/diratukuz/lphdifh/piwojuvudusonoz.pdfIn PDF document text
    • http://vimabanu.sportsontheweb.net/xolefulezajeni.pdfIn PDF document text
    • https://cdn.sqhk.co/kebabefepu/fhYQgiA/fatokudaki.pdfIn PDF document text
    • https://cdn.sqhk.co/bamazaludez/idEifbZ/vokenonasazifutofabiz.pdfIn PDF document text
    • https://cdn.sqhk.co/xaloxezajaga/GKhgMgc/88949048503.pdfIn PDF document text
    • http://moviesaddaa.online/daily_self_discipline_martin_meadowshk2ft.pdfIn PDF document text
    • http://spiritstudio.ru/el_nombre_de_la_rosa_resumen_completo7thet.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxolusufa/dyOKGXL/zombie_hunting_simulator_codes.pdfIn PDF document text
    • https://cdn.sqhk.co/mewixamok/DhbgdPV/all_star_soccer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_68ea2d4892fb47c7a16bdee35e9b0261.pdf?index=trueIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_b7adf2ae578c433b9b4443a8863f78f5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pasawe/adobe_air_free_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/wef_global_competitiveness_report_2017-_18.pdfIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_0302c10d265a4042a981361962129e7f.pdf?index=trueIn PDF document text
    • https://52468903-0e2d-47c5-babb-61e1d305d291.filesusr.com/ugd/32777b_22afcad8ceb0417f80bfd48f988b11ec.pdf?index=trueIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_c22b3ae6147847ffbe792ee5f6726616.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/26262227517.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/toro_timecutter_ss5000_drive_belt_routing.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_off0001747c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1747C 5584 bytes
SHA-256: fc637f617ee45c9666f954219e4d529cace7ac2f13ec2c347df3b8642023fe4d
font_01_sfnt_off00018772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18772 12432 bytes
SHA-256: 20e3413a3dca593b0aef2a555b02d278273d11eca42cdb69885a5190f1c8f142

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