Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed0936ec8fd5fd3…

MALICIOUS

PDF

76.0 KB Created: 2021-03-05 12:44:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9aa5e5a232d557bf50f3eba8cc67c250 SHA-1: 67c4b4da4ba0e4fd74c1d2897b5553c21c6d0bb6 SHA-256: 1ed0936ec8fd5fd34c6e62450d49ed32be1f45fd199a503243d36e30d8933c10
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains, and one specifically to 'xezojetit.ru/strik' with UTM parameters suggesting a phishing lure. ML and ClamAV heuristics confirm its malicious nature, classifying it as phishing and a Trojan. Although no scripts were explicitly extracted, the PDF structure and embedded URIs strongly indicate an attempt to redirect users to malicious sites, likely for credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xezojetit.ru/strik?utm_term=youtube+ukulele+music+theory PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460449/normal_5fd37a011f96f.pdfIn PDF document text
    • http://bikelumonekodex.mygamesonline.org/oracle_sql_concatenate_string_and_number.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365624/normal_6031adb8c172f.pdfIn PDF document text
    • http://vitofemegawe.getenjoyment.net/danby_premiere_12000_btu_portable_air_conditioner_manual.pdfIn PDF document text
    • http://diluzadumavotux.getenjoyment.net/suviwunesovitit.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/88275423161.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480905/normal_5fd3caff374da.pdfIn PDF document text
    • http://namedaun.fun/mopesasujuzexrnzc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467306/normal_5fdea14f36679.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423714/normal_5fe10183e6c7e.pdfIn PDF document text
    • http://adminhalil.com/system_verilog_casezhevml.pdfIn PDF document text
    • http://jobware.pro/chevening_reference_letter_template2ex68.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lupixopuvir.onlinewebshop.net/pigukewoxetudisosoxisima.pdfIn PDF document text
    • http://fetekovabu.onlinewebshop.net/dibezeluwumexew.pdfIn PDF document text
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_8d5afbc3a9fa4e29880a09b49f0260bf.pdf?index=trueIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_585876be9b3c445db6803d06932a5b05.pdf?index=trueIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_7c4f3f16c98e4074b956f30010b769a6.pdf?index=trueIn PDF document text
    • https://b7f5b04e-b247-49a4-9dc0-39f0c843ec09.filesusr.com/ugd/b56f86_df1e4fd3f76b4450bd61222bf5805281.pdf?index=trueIn PDF document text
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_841610e55ff14ca5902da09a402ae277.pdf?index=trueIn PDF document text
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_97d5486efbe54326a4acb32df2bab9e8.pdf?index=trueIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/tasajukexabubo.pdfIn PDF document text
    • https://6b2f37ea-3696-4b87-858b-663c379f6f6f.filesusr.com/ugd/16879a_f4c23f91ec114e329be155109f93947e.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_off0000ed36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED36 5096 bytes
SHA-256: 37909ddc0a19805debabd6a404069d7743dc218a80c3c23ee28e8e646cef9030
font_01_sfnt_off0000fe72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE72 10460 bytes
SHA-256: 1c3af4d2baf5344d4212a79596f6a373a87520f2df1fa54eb8d7d42999bd1a97

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