Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6d41748c06a124…

MALICIOUS

PDF

73.6 KB Created: 2021-06-12 04:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 54ceeadb84fa51eace5dd50c145c38ce SHA-1: 03e94d160b4b9a692e5796d3a6a2ceeab0931833 SHA-256: 2b6d41748c06a124399884f1aef00bad99516d2125ea488fdf1971304b4bf838
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The PDF functions as a link farm, containing numerous embedded URLs pointing to external sites, with at least one URL (`https://oniceh.ru/pbw?utm_term=geralt+witcher+series`) being directly associated with the malicious detection. The presence of many links on disposable hosting further supports a phishing or malicious redirection scheme.

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://oniceh.ru/pbw?utm_term=geralt+witcher+series PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4502511/normal_5fe1a3c850979.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480383/normal_5fe4fa71b5e12.pdfIn PDF document text
    • https://fifukujujaki.weebly.com/uploads/1/3/2/6/132680890/8dab47d6d763b92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425916/normal_5fd2a14948ce0.pdfIn PDF document text
    • https://buxijoxusezo.weebly.com/uploads/1/3/1/4/131483018/jivuguwevaxaberuse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465400/normal_601a29d9564f6.pdfIn PDF document text
    • https://fojefutitamok.weebly.com/uploads/1/3/3/9/133989463/rebusasuram_rumine_mojas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420939/normal_60527a618742f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479474/normal_605998ec9c588.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jutifakukap.pbworks.com/f/lg_oled_65e7p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11dae21f-e32c-4b9d-befa-dbfece26515c/fozivafiwonowufe.pdfIn PDF document text
    • http://najapenoz.pbworks.com/w/file/fetch/144620349/kametukejalapupobapo.pdfIn PDF document text
    • http://nukuxim.pbworks.com/w/file/fetch/144752973/after_effects_cc_2017_full_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c26efea-8bcc-4570-9197-63d79a1a6621/kaberawarirotufa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b945ea0f-d12b-4f61-a1fc-e595161fcc65/how_do_i_add_mendeley_to_word_2019.pdfIn PDF document text
    • http://lulatigono.pbworks.com/w/file/fetch/145117518/free_robux_2021_apk.pdfIn PDF document text
    • http://joraxakegeg.pbworks.com/f/97740347772.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/f/pdf_to_word_online_free_i_love.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2874051-ac48-49fc-81b4-89ca05cd18d5/carry_on_liquid_size_jetblue.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_off0000e089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE089 5008 bytes
SHA-256: 61475b527839c0b8c81d8f4ced159916b97e6165a7d74bc31e2c832723a25f5f
font_01_sfnt_off0000f19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19A 11944 bytes
SHA-256: 341f14a5db044f148ee35967669740ede59f305e19a4d69a1643e4581852611a

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