Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5fa74d350ca6b3…

MALICIOUS

PDF

71.1 KB Created: 2021-06-08 05:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 943d9aabf92c28745fdd1026a461ddb0 SHA-1: 3fd9324e0611115b1cb22632b404fcda56f19668 SHA-256: bd5fa74d350ca6b3ded49c43611bfd357482128660ec7d3aa9c0188a40c8c9b2
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=vans%20old%20skool%20mens%20size%208.5 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4417040/normal_6004e4f483738.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384142/normal_5fdc2c7f34b7a.pdfIn PDF document text
    • https://desebenenoda.weebly.com/uploads/1/3/5/3/135348916/1d0197c7bca5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390371/normal_60253cff9e32d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426424/normal_5fe518922921a.pdfIn PDF document text
    • https://rajikaluniker.weebly.com/uploads/1/3/1/3/131383998/fanipenubu_xomuv_xukubigojime.pdfIn PDF document text
    • https://kipamafulu.weebly.com/uploads/1/3/4/5/134588126/varerilidegerojazi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454299/normal_5ffb65ffb7645.pdfIn PDF document text
    • https://gedenotovet.weebly.com/uploads/1/3/1/3/131379555/rajate-muriwowonakete-xotukefaxezi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zizovitunex.pbworks.com/w/file/fetch/144483423/kalnirnay_2021_marathi_calendar_march.pdfIn PDF document text
    • http://pigedigasexu.pbworks.com/f/27686290426.pdfIn PDF document text
    • http://luwivaj.pbworks.com/f/pinova.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/f/zopigexebuwenusixilipomev.pdfIn PDF document text
    • http://midevodimu.pbworks.com/f/sat_biology_practice_test_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bcb0ad8-5be9-4c8c-9363-cb2b337a231a/new_yorker_cover_last_week.pdfIn PDF document text
    • http://dumunivuniv.pbworks.com/f/fezisepapus.pdfIn PDF document text
    • http://mulasamesi.pbworks.com/f/besagejisidodaraxure.pdfIn PDF document text
    • http://redejok.pbworks.com/w/file/fetch/144521169/sujet_brevet_physique-chimie_avec_corrig_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3e129f4-aff7-4a40-8de2-2b63d288c97b/what_is_meant_by_the_term_just_social_structure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27a871e2-b123-41ca-a4de-fc7ab80c60f8/hp_photosmart_plus_b210_connect_to_wifi.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144422313/public_administration_books_for_upsc_optional.pdfIn PDF document text
    • http://zekodunu.pbworks.com/w/file/fetch/144447552/zojapunevusavemunu.pdfIn PDF document text
    • http://mudowomuxexo.pbworks.com/f/af_sosyal_bilimlerde_aratrma_yntemleri_ders_notlar.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_off0000d8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F5 5304 bytes
SHA-256: feee2f8acb7e2b92a79408bd7e0adcb6e48914aaf7faaf6000ea13412b870c37
font_01_sfnt_off0000eb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB04 10904 bytes
SHA-256: 50a6a4dfc5161def9185117be617bbec5fbd7fde803c50c193c5edfac25154fe