Malicious PDF — malware analysis report

Static analysis result for SHA-256 b545aded5d81067a…

MALICIOUS

PDF

71.0 KB Created: 2021-04-08 01:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 559a464dda1c05ce7ddc9c077276951d SHA-1: d99f950d21ee2e47387cade932564bff7e0f4fbc SHA-256: b545aded5d81067a4d84c266fe155187fac4b4e723fc7fe6b3da54bf25b0864d
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The presence of embedded URLs and the PDF's structure point towards an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=binomische+formeln+%25C3%25BCbungen+mit+l%25C3%25B6sung+pdf PDF link annotation
    • http://kepuxom.mypressonline.com/altronix_power_supply.pdfIn PDF document text
    • http://mebovedu.getenjoyment.net/tesis_arquitectura_sustentable.pdfIn PDF document text
    • http://bisapusid.mypressonline.com/anatomy_of_bone_marrow.pdfIn PDF document text
    • https://cdn.sqhk.co/jevamivuvugi/ia8idgh/kobe_and_gigi_wallpaper.pdfIn PDF document text
    • https://lukobuguw.weebly.com/uploads/1/3/5/3/135396798/fcee38b24f0b125.pdfIn PDF document text
    • https://miletotafog.weebly.com/uploads/1/3/4/7/134758503/9765238.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/instrumentos_para_la_recoleccion_de_datos_concepto.pdfIn PDF document text
    • http://foripekomufotir.mypressonline.com/lijute.pdfIn PDF document text
    • https://lizameguxif.weebly.com/uploads/1/3/1/6/131606128/sejumodigakerojo.pdfIn PDF document text
    • https://cdn.sqhk.co/baxijaxazixi/lhgSjcw/jiboratuzefilu.pdfIn PDF document text
    • https://zanobevaduj.weebly.com/uploads/1/3/2/6/132682049/3414749.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_9674b08371b64d40aab665d2503d4531.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sewamos/o_que_faz_um_cerimonial_de_formatura.pdfIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_f9a64358abb5441bbab4f74f15486fc2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/61923182130.pdfIn PDF document text
    • http://gemovimuwopete.atwebpages.com/introduction_to_composite_materials_design_third_edition.pdfIn PDF document text
    • http://rugoxesoteko.myartsonline.com/13492788526.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/39676867069.pdfIn PDF document text
    • https://6cb1c90e-07cf-4522-b85d-4edd8abc33c8.filesusr.com/ugd/0c41e7_4239411ea03044e99491fbc33eb1d061.pdf?index=trueIn PDF document text
    • http://vesedakowata.onlinewebshop.net/novakewanetiba.pdfIn PDF document text
    • http://buzumigasox.myartsonline.com/nios_admission_form_download.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_off0000d32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32B 5804 bytes
SHA-256: 00221835ea67ab6152157152337bbbf16a0b356578c78b427a004c1190d9218a
font_01_sfnt_off0000e63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63D 11544 bytes
SHA-256: 79f83b8bd65c1c5270b12412836e2101aa04c4ab86248d06b3c4f635ed61e7df

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