Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfbd6f109609d41a…

MALICIOUS

PDF

72.7 KB Created: 2021-03-28 12:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3bd86fd0a73276ab8d10e2d5dcc30a99 SHA-1: 297f59cc841ed16eae21551b29afceee6da0ef7a SHA-256: bfbd6f109609d41afd9e627bf8c2af98576eaf158a5370a4c5baafabff1360ef
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'office 365 administration' and 'wkhtmltopdf', suggesting a lure to a potentially malicious site disguised as a document download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://yafferge.ru/award?keyword=learn+office+365+administration+pdf In PDF document text
    • http://shopsupergood.site/fireproof_mineral_wool_insulation2l7fm.pdfIn PDF document text
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/ramoxoxapojew-boxovuxit.pdfIn PDF document text
    • http://smartline58.ru/2077972207au088.pdfIn PDF document text
    • https://zujuwaxi.weebly.com/uploads/1/3/5/3/135307850/9538020.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/el_cuervo_edgar_allan_poe_descargar.pdfIn PDF document text
    • https://gupijevud.weebly.com/uploads/1/3/1/4/131407369/4159736.pdfIn PDF document text
    • https://vebuleme.weebly.com/uploads/1/3/4/3/134321641/3655370.pdfIn PDF document text
    • http://novubelugalij.medianewsonline.com/zerom.pdfIn PDF document text
    • http://ionatr.fun/534995024963m8m.pdfIn PDF document text
    • http://gta-msk.ru/sokobumiruduno28r.pdfIn PDF document text
    • http://rifajobabinafe.22web.org/94390346094.pdfIn PDF document text
    • http://taribada.22web.org/cuidados_post_cateterismo_cardiaco.pdfIn PDF document text
    • http://wepisoja.mypressonline.com/english_unlimited_placement_test_cambridge.pdfIn PDF document text
    • http://healthit.space/pipekugavadiwavudoswiopb.pdfIn PDF document text
    • http://ductsunlimitedins.com/ben_10_ultimate_alien_coloring_pages_to_printzb8uc.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://sukokovevaz.atwebpages.com/44145407719.pdfIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/administracion_de_medicamentos_via_otica.pdfIn PDF document text
    • http://vunonam.atwebpages.com/how_to_reset_equate_blood_pressure_monitor.pdfIn PDF document text
    • http://bawavejukedosuv.epizy.com/vosigaz.pdfIn PDF document text
    • http://sivikonalijuto.myartsonline.com/topufixunoxamotipixe.pdfIn PDF document text
    • http://zevesijuduma.atwebpages.com/non_governmental_organizations_list.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_off0000d10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10A 5440 bytes
SHA-256: 64b3fa6f212decab0a90da2f5d61500e685d0fe1845036d1db59f3e849236725
font_01_sfnt_off0000e36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36A 10884 bytes
SHA-256: 8add35c6628b8b61196f1b04e1aa292cf127c1cc0c354448dcb5122c24bd843e
font_02_sfnt_off00010781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10781 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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