Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6bef0ea103cdb2c…

MALICIOUS

PDF

121.2 KB Created: 2021-03-03 02:52:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fdcf70aa2932f9153b8a8bb948248bb8 SHA-1: 78319c2def57de8f854001f7ec7f5904d0150368 SHA-256: c6bef0ea103cdb2c1c5c25ccac67b22de8641120bb9a01dc02558d255fa04495
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=amazon+echo+dot+user+guide+uk PDF link annotation
    • https://cdn.sqhk.co/sofizagumup/RjeGj3u/what_song_would_you_dedicate_to_me.pdfIn PDF document text
    • http://hargotel.xyz/chloroform_solvent_interactionsz75w9.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/MgfBAii/brilliant_distinctions_coupon_october_2020.pdfIn PDF document text
    • http://snapchat-alert.com/842549296234xhnb.pdfIn PDF document text
    • http://joici.xyz/absent_class_formal_letterm9yqg.pdfIn PDF document text
    • http://kyhni.site/comforting_words_for_mournersespw3.pdfIn PDF document text
    • http://creditinquiry.info/45898331744r0cdq.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/icLWrpK/niwiratuxurazokuvuxoroj.pdfIn PDF document text
    • http://zvezdasevera.online/operatoria_dental_barrancos_5ta_edicion_gratis6wuys.pdfIn PDF document text
    • https://cdn.sqhk.co/goganededem/whfidgw/fozuwoj.pdfIn PDF document text
    • http://adanakebap.org/smart_insights_marketing_campaign_plan_templatey9fgg.pdfIn PDF document text
    • http://chambrehub.xyz/tronicaltune_plus_set_type_c_chrome_strat_styled9ivc.pdfIn PDF document text
    • http://byseles.xyz/la_estancia_cierra_a_m_azul_nile_le50xjr.pdfIn PDF document text
    • https://cdn.sqhk.co/joxonorapa/diaM3BO/dorujibebozewogofizak.pdfIn PDF document text
    • http://esclick.pro/samsung_health_weight_management_not_workinghov98.pdfIn PDF document text
    • http://minuette.me/ropefepabuferutekblqgp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xubeveg.epizy.com/cinema_4d_full_version_free_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/models_of_health_psychology.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BAE 5304 bytes
SHA-256: f77ec87d97e562587c4febd7c492b7e46e79e755d3dc9ecf9343b54c91504878
font_01_sfnt_off00019d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D85 14168 bytes
SHA-256: 5261ee6443749c55d9035f5c0256fe09ccaee82b9ed3fa7862f340cfde5e656e
font_02_sfnt_off0001c95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C95F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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