Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ccbf8aaaabb136…

MALICIOUS

PDF

75.8 KB Created: 2021-03-17 07:00:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 0dd024fefbf4c63b5baa4ed8873f9458 SHA-1: 247d254be2dcd0f842b530d218178986a068ffcc SHA-256: 66ccbf8aaaabb1367857de33c82ef2cd1f714718dedb424eee57142e7cb3778c
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV both strongly indicate maliciousness. The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links, potentially to spread malicious content or phish for credentials.

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://pelibifir.ru/123?utm_term=a+b+c+d+video+song PDF link annotation
    • http://siwutasir.iblogger.org/puvojerovo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424953/normal_6038ceb724985.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425235/normal_602643c8da1ae.pdfIn PDF document text
    • http://dasiwujupuna.sportsontheweb.net/assimilation_and_dissimilation_in_phonology.pdfIn PDF document text
    • http://rumigiwataj.getenjoyment.net/92306116840.pdfIn PDF document text
    • http://zisezamerares.mygamesonline.org/advanced_life_support_manual.pdfIn PDF document text
    • http://lefavapexusa.iblogger.org/best_formal_dress_stores_melbourne.pdfIn PDF document text
    • http://pepariravifaza.getenjoyment.net/novel_the_hunger_games_bahasa_indonesia.pdfIn PDF document text
    • http://votatiji.22web.org/3rd_conditional_questions.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389354/normal_5ff12087b51a0.pdfIn PDF document text
    • http://dogalijun.scienceontheweb.net/citizen_eco_drive_world_time_chronograph_easyjet.pdfIn PDF document text
    • http://werikipirojenob.scienceontheweb.net/26910615053.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffe60813-44f7-40da-8a36-7d00d0070598/analisis_del_libro_el_lenguaje_del_cuerpo.pdfIn PDF document text
    • http://fogovulosuzan.onlinewebshop.net/curso_apicultor.pdfIn PDF document text
    • http://fonugaxow.epizy.com/pathetique_sonata_2nd_movement_sheet_music.pdfIn PDF document text
    • http://tefixifurelo.epizy.com/life_after_death_in_hinduism.pdfIn PDF document text
    • http://lizedugenok.epizy.com/soguzokesafonujiliv.pdfIn PDF document text
    • http://runuvezufonesex.rf.gd/fitaluk.pdfIn PDF document text
    • http://dabigox.rf.gd/best_anti_inflammatory_foods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a19b583c-b358-4238-bd68-05d3f2bc570b/19566086037.pdfIn PDF document text
    • http://nifukugobu.rf.gd/dremel_router_template_guide.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_off0000eb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB20 4960 bytes
SHA-256: 914dec257fd4571c22a9903837538e0d03860c6962da7449854fc783a72c99ad
font_01_sfnt_off0000fc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1F 11132 bytes
SHA-256: f228ae3ab554d2c654a800206f9289924d60d87dc0aae059976a420ffec7e0fe

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