Malicious PDF — malware analysis report

Static analysis result for SHA-256 939e3780594b3577…

MALICIOUS

PDF

131.0 KB Created: 2021-02-19 14:33:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f797edd50f4d8ea6262c85146d67f6ea SHA-1: 5bdf138667563447b2ba26c29aec38bbb3c0acda SHA-256: 939e3780594b3577f85664206753f2df027313a88458dbbdcf8e4cced7f49d64
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically 'https://yafferge.ru/strik?utm_term=sound+blaster+evo+zx+software'. The ML classifier and ClamAV also flagged this PDF as malicious. While no scripts were extracted, the presence of malicious URLs suggests an attempt to redirect the user to a phishing site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/strik?utm_term=sound+blaster+evo+zx+software In PDF document text
    • http://prizinsta365.website/expendables_4_full_movie_in_englishqxc3n.pdfIn PDF document text
    • http://in-arenas.com/wow_wotlk_blacksmithing_guidevdxtz.pdfIn PDF document text
    • http://grizhoff.ru/espn_basketball_fantasy_cheat_sheetzujlc.pdfIn PDF document text
    • http://mubinazo.22web.org/what_are_the_different_roles_in_scrum_process.pdfIn PDF document text
    • http://nasporte1.fun/jusudosetekuummh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/vuxuviban.pdfIn PDF document text
    • http://tiguvazigavis.epizy.com/progressive_tense_quiz_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/web_application_development_proposal.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/valavemozalopako.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/characteristics_of_quality_management_information_system.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/77843295752.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/23819321062.pdfIn PDF document text
    • http://kunaraxanoxun.epizy.com/color_red_worksheets_for_preschool.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/halo_the_fall_of_reach_full_movie_free.pdfIn PDF document text
    • http://lofomaseforuz.rf.gd/31594771992.pdfIn PDF document text
    • http://kipixuge.epizy.com/commission_sharing_agreement_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/computer_systems_a_programmers_perspective_3rd_edition_github.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/65425622922.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/13878949873.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_off00019194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19194 8348 bytes
SHA-256: 02e52ce7b9d95d63a67f7657355b1062467d62cc71ba39568c2d9d39d13151f7
font_01_sfnt_off0001aca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACA5 5412 bytes
SHA-256: 184ce47aa744532a77cbc5078a7b89cf8d3156ad89e36a5d840fba38937c77d3
font_02_sfnt_off0001bf3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF3B 23024 bytes
SHA-256: 153144fa02deeefa874fa99a058e2022a700bd5a5a265015c61e43412b9ba818