Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b2a7a6d41f7389f…

MALICIOUS

PDF

72.5 KB Created: 2021-03-23 18:43:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f506838da9c3db8a1b8ce16da92e3ef7 SHA-1: 753e97c7d5f21f65aa8a55c648f6f0c0bde7f767 SHA-256: 0b2a7a6d41f7389f6b36734f6b935c094e90cad66d69db5ce0d701886bad7f78
126 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including external URI links and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. The embedded URLs point to suspicious domains, likely intended to host malicious content or phishing pages.

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://pelibifir.ru/strik?utm_term=focusrite+control+tutorial
    • https://cdn.sqhk.co/bedazume/X7N5hdV/miralax_and_metamucil_together.pdf
    • http://japancar-sib.ru/taking_sides_clashing_views_on_legal_issues_18th_editiontomld.pdf
    • http://hellesypakk.online/vonesomuvawamuviwugs0uf.pdf
    • http://xebupado.mypressonline.com/zagepixonubunizupomurival.pdf
    • http://copyrightsafetyhelps.com/who_said_there_will_be_rivers_of_bloodoqkk6.pdf
    • http://bu-markett.com/narijedilurilagowuweganupay.pdf
    • https://cdn.sqhk.co/rifokinimito/ijeljis/34745896913.pdf
    • http://gufurebu.medianewsonline.com/monster_vault_4e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jotizifime/how_do_i_reset_my_verifone_terminal.pdf
    • https://s3.amazonaws.com/takateg/capstone_project_report_example.pdf
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_cd7517d77bf942079159969e24ae686b.pdf?index=true
    • http://ravesezubepad.epizy.com/psychological_effects_of_war_on_soldiers.pdf
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_6e51ec294a054a5ab83382efebb84141.pdf?index=true
    • http://zatuvejamubolo.atwebpages.com/38872427388.pdf
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_05fa4147abb84bdb9e330a00c8be1928.pdf?index=true
    • https://s3.amazonaws.com/jevelel/94495316760.pdf
    • http://gesuposobevexo.rf.gd/eriksons_stages_of_development_scholarly_articles.pdf
    • http://jovuxajir.rf.gd/45663493186.pdf
    • http://winenezufu.epizy.com/factors_affecting_students_academic_performance_quantitative_research.pdf
    • http://zopopujeji.rf.gd/bosunobazefo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df34.bin
74b8e3df0709f581968a9bedf3c82956cddfc5f3c947551c5553f1ac7895aa4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF34 4748 bytes
font_01_sfnt_off0000ef66.bin
0f77fc5ff0eed9c71436c5d89425ee0e27cbe9e2b675e59648d59f044f5b9956		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF66 11016 bytes

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