Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf2ec41a6da41a5…

MALICIOUS

PDF

85.5 KB Created: 2021-03-01 19:06:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: ca03065af483b4751b9b2b19e010a2b0 SHA-1: 5ac0e875028a65a173d00cfed140452500b3bf6d SHA-256: 3bf2ec41a6da41a565d8ec62975754429e7873d6f391132d903b4c8fadc3dbc6
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content, though heavily obfuscated, are consistent with attempts to redirect users to potentially harmful web resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/wix?keyword=completing+the+square+worksheet+pdf PDF link annotation
    • https://kimiligemapi.weebly.com/uploads/1/3/4/3/134343210/9944511.pdfIn PDF document text
    • https://dotofufodil.weebly.com/uploads/1/3/5/3/135313806/e2053503f23b6.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/jbChek9/xelozibexowiruzefufisa.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/h44jjhj/craftsman_tool_set_450.pdfIn PDF document text
    • http://sipipewawezizuf.getenjoyment.net/6252738916.pdfIn PDF document text
    • https://pudewufaziv.weebly.com/uploads/1/3/0/7/130739775/9851632.pdfIn PDF document text
    • https://wixalotoduf.weebly.com/uploads/1/3/5/3/135305273/difipe.pdfIn PDF document text
    • https://bitoxogosem.weebly.com/uploads/1/3/4/3/134386372/57288599396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481062/normal_5fd1a97332489.pdfIn PDF document text
    • https://cdn.sqhk.co/taranumota/SHu6sVm/jiffy_lube_chicago_il_60617.pdfIn PDF document text
    • https://cdn.sqhk.co/gujipiror/gjCjhif/jugotenekugel.pdfIn PDF document text
    • http://kobivoweder.mypressonline.com/what_replaced_omb_circular_a_133.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xegafezoze.rf.gd/lorubozibafaxokulobodoj.pdfIn PDF document text
    • http://nabenejajoko.myartsonline.com/dispositivos_de_entrada_salida_almacenamiento_y_procesamiento_de_una_computadora.pdfIn PDF document text
    • http://pepukogabam.rf.gd/wivorolusuvigapediloma.pdfIn PDF document text
    • http://gurabagoderes.atwebpages.com/does_tegrity_record_your_screen.pdfIn PDF document text
    • http://fijukarevi.epizy.com/kallis_sat_practice_test_3_answers.pdfIn PDF document text
    • http://pitugozuput.epizy.com/pasekasisowazilavaniv.pdfIn PDF document text
    • http://mitikujedusor.epizy.com/78564732988.pdfIn PDF document text
    • http://futakanawus.onlinewebshop.net/sedimuxobofujazigaj.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_off00010997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10997 5644 bytes
SHA-256: 4b78943be9a519ac1b115f64f9d960abb935f5440ece7ccdba18478d85d987d0
font_01_sfnt_off00011ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA5 13732 bytes
SHA-256: 7bc569ca6f1f098ff0e2e234cc9328d749d86d5eb4d80d3152b27a26d353a454

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