Malicious PDF — malware analysis report

Static analysis result for SHA-256 17623034d6d6cf3d…

MALICIOUS

PDF

79.1 KB Created: 2021-04-01 22:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eaed98d65d0b4e2822953a917cc8f1e7 SHA-1: ebce3e79bbcc262c0d436af60f6a9219481d3cd8 SHA-256: 17623034d6d6cf3da11b0810f07e30614637b8298cec03df84b03ea82e6d5f62
126 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating it's a link farm on disposable hosting, with a specific URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the embedded URL is the primary indicator of a phishing or redirection attempt.

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://jacksth.ru/strik?utm_term=how+to+remove+stuck+beater+from+kitchenaid+mixer
    • http://nugitesa.iblogger.org/sekomajoruwikebasofur.pdf
    • https://cdn-cms.f-static.net/uploads/4489058/normal_604aff4aa5047.pdf
    • https://static.s123-cdn-static.com/uploads/4444647/normal_5ffefc01cf0af.pdf
    • http://bebinovixox.iblogger.org/66188382535.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rexogeguxosix/continental_girbau_washer_for_sale.pdf
    • https://s3.amazonaws.com/zarusegibitumet/what_are_the_3_types_of_writing_creative.pdf
    • https://uploads.strikinglycdn.com/files/6a32ed12-c513-45fc-9abc-f89474299673/dell_1905fp_driver.pdf
    • https://uploads.strikinglycdn.com/files/d42d5e2a-8e5d-4ccd-abac-b38f87aaa850/separating_john_updike_analysis.pdf
    • https://uploads.strikinglycdn.com/files/db5a0913-3c27-4eea-8aa1-fd3411b49ae2/how_to_book_driving_test_appointment.pdf
    • https://uploads.strikinglycdn.com/files/be6ade1a-b805-4b2b-b3c7-0ecec6e70813/fadem.pdf
    • https://uploads.strikinglycdn.com/files/a7a9675a-26c7-434b-b370-dc2fbac30f0b/how_to_look_up_driver_license_number.pdf
    • https://s3.amazonaws.com/sasufufa/usmle_step_1_dates_2021.pdf
    • https://s3.amazonaws.com/xufoxorog/20853812478.pdf
    • https://s3.amazonaws.com/gozilum/bang_bang_songs_free_2014.pdf
    • http://wotiputega.epizy.com/2618404768.pdf
    • http://varoniwarovez.rf.gd/2193830415.pdf
    • http://suludigana.epizy.com/impartial_reporter_phone_number.pdf
    • http://gavomowiwolaxu.rf.gd/anemia_peru.pdf
    • http://wekameti.rf.gd/61583473018.pdf
    • http://bisidajidosetuj.rf.gd/maths_riddles_with_answers_for_class_7.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f50f.bin
8a726eab4f4fdaf65f010060676dc6b1d1a16d93b8762cd7d75a8e1b61bfaa62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 5612 bytes
font_01_sfnt_off00010815.bin
4564231df39741ba5873ec0e51448cc2a9fba1e096116bb0d13c9dc1e6e4189e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10815 10868 bytes

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