Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eee45170ffab9a7…

MALICIOUS

PDF

81.5 KB Created: 2021-03-20 07:26:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 38881ba8c87ed051148d86d5f162be90 SHA-1: b30aaa2a9b2464eebb50f5d173f8a7fb74fa557f SHA-256: 4eee45170ffab9a72312cf1870d5bb166cbb7acaf0f94ca5e5a4dc36da5c8ae8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration of them pointing to disposable hosting and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of a URL like 'https://xajibur.ru/123?utm_term=tamil+news+hunt+software+free' suggests a lure for free software, likely to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/123?utm_term=tamil+news+hunt+software+free PDF link annotation
    • http://vesitifev.22web.org/77890084566.pdfIn PDF document text
    • http://servicesforsupport.com/glory_road_2006_soundtrack1iogp.pdfIn PDF document text
    • http://vas-rem.ru/4641573379047lr7.pdfIn PDF document text
    • http://jivopifavu.22web.org/best_spreadsheet_app_for_macbook.pdfIn PDF document text
    • http://rajenajodaf.iblogger.org/bawivilamuwu.pdfIn PDF document text
    • http://shopbest.online/dsc_add_user_codesak1tp.pdfIn PDF document text
    • http://delojenopow.66ghz.com/boy_scouts_whittling_chip_card.pdfIn PDF document text
    • http://rodina38.ru/jexuwusuxaud0qy.pdfIn PDF document text
    • http://goshop32.site/punctuation_in_compound_complex_sentences8tz4o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0d13d0a4-8e1c-4976-97a9-25f6f21197cd/xebogejegetoruzoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa7e4941-7810-4814-94be-f5efd8c86472/briggs_and_stratton_elite_series_pressure_washer_2500_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b76bed04-80d3-4efe-8ba8-1c7b5aca2921/tactical_medical_training_near_me.pdfIn PDF document text
    • https://e4c06157-4c4c-4c30-848d-1ce07482e123.filesusr.com/ugd/99e070_2985cc92368d4c4cb5d835cd4b202f51.pdf?index=trueIn PDF document text
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_41d59ca78a84418fbd45e5f48f054622.pdf?index=trueIn PDF document text
    • http://sajetubaj.epizy.com/85603420753.pdfIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_ff1e11969be446988a3323d26fbec8c0.pdf?index=trueIn PDF document text
    • http://gedonisezif.epizy.com/2015_ski_doo_owners_manual.pdfIn PDF document text
    • http://kesuzidadubitik.rf.gd/free_converter_to_word_file_online.pdfIn PDF document text
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_7b81ddec8a104f16959ba485b21eace0.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_af79f0d191454ccfbc867b0cf6486b0b.pdf?index=trueIn PDF document text
    • http://fubegamo.epizy.com/11667090256.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A6 4928 bytes
SHA-256: b486c397f097a148849d6ecf92eca674c4f58f56526b88b840a77cb96d8ca7bb
font_01_sfnt_off00010448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10448 10832 bytes
SHA-256: f5afd0f3004eaa4ccb668486a9fad9ceee7ae105c8589f6af1b8ea6dbde06121
font_02_sfnt_off00012908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12908 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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