Malicious PDF — malware analysis report

Static analysis result for SHA-256 5536c6d122ebc5a4…

MALICIOUS

PDF

78.3 KB Created: 2021-04-07 21:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 341fad425fd03d8be1a3722e08d94e8b SHA-1: 9a43c71e312ae7baafb68563837bde1e92318acb SHA-256: 5536c6d122ebc5a49c504021a1f3d37df61491f3ed0783123ddbd5242a7996a8
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing campaign. The presence of external URIs and the 'link farm' heuristic strongly indicate an attempt to redirect users to potentially harmful websites.

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://nipisod.ru/strik?utm_term=how+to+fill+a+walgreens+humidifier PDF link annotation
    • http://xitabijasava.getenjoyment.net/frame_relay_protocol_architecture.pdfIn PDF document text
    • http://kudusakepupa.sportsontheweb.net/autocad_mcq_questions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450046/normal_60443990b7be9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409607/normal_602a839a51ba6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456122/normal_5fdc661e650d1.pdfIn PDF document text
    • http://naxajogilelog.medianewsonline.com/absolute_value_worksheets_with_answer_key.pdfIn PDF document text
    • http://libidisebosuv.22web.org/254713320.pdfIn PDF document text
    • http://vaxisezawoged.scienceontheweb.net/dante_purgatorio_canto_xi.pdfIn PDF document text
    • http://levojefozaloro.mywebcommunity.org/variables_in_qualitative_research.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/lang_complex_analysis_solutions.pdfIn PDF document text
    • http://devivitonewe.sportsontheweb.net/advantages_and_disadvantages_of_centralised_curriculum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487386/normal_5fd7f29225250.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388407/normal_5fddc154070f8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gafodix.myartsonline.com/lapolodolulejuk.pdfIn PDF document text
    • http://ximedamolaxeve.epizy.com/ip_calculator_subnet.pdfIn PDF document text
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_a42b9a1ba42742d19571a9a3005f5777.pdf?index=trueIn PDF document text
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_054ce810475b452487da2862de22a642.pdf?index=trueIn PDF document text
    • http://gorefoverotiw.epizy.com/buvufexepurilunewubaw.pdfIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_43a93e63b8984a1087549ba56cd9d9f5.pdf?index=trueIn 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_off0000f51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51E 5376 bytes
SHA-256: bb88f98cfa762f40a2b8868e23fae567f43a4e88bafae3bb56ee98e736a3d30d
font_01_sfnt_off00010749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10749 10912 bytes
SHA-256: 3729e9bee7702f246623f94edcc8a525f840d1a643323c0cff688feeb69d8065

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