Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8d312f2339091e…

MALICIOUS

PDF

75.3 KB Created: 2021-04-27 07:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfefbbda755e61426ba2cd1e845e348f SHA-1: d1bc8aa17259133bf1624063704d2bd0c6ad4613 SHA-256: ef8d312f2339091e61294af32aafb970d1c82c93f1ece35f76c2f9593f1c1204
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is part of a link farm designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=how+to+connect+epson+wf-2760+printer+to+wifi
    • https://cdn.sqhk.co/rowazazapa/8gjighW/goripevasufavu.pdf
    • https://cdn.sqhk.co/nusatabi/iapharm/bodoni_sans_display_font_free.pdf
    • https://gifogesedex.weebly.com/uploads/1/3/4/6/134625351/nuxavototijeb.pdf
    • https://xefolulewonud.weebly.com/uploads/1/3/1/4/131406676/92da95ccc9.pdf
    • https://cdn.sqhk.co/sotatixorawi/gjghhcr/75455050105.pdf
    • https://cdn.sqhk.co/pedidagow/cwicfjd/91052329717.pdf
    • http://pedosapabosa.iblogger.org/what_is_the_salary_of_hardware_engineer_in_us.pdf
    • https://sumomaduge.weebly.com/uploads/1/3/4/8/134884200/124c0445c891.pdf
    • https://cdn.sqhk.co/xovinexesun/cj4ge8J/vlc_music_player_for_android_free_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_84a2082a4c6e49489a8b024c6d5f151b.pdf?index=true
    • https://s3.amazonaws.com/ruzumeb/kijir.pdf
    • https://s3.amazonaws.com/mefonevimimix/zebav.pdf
    • https://s3.amazonaws.com/jijari/daginigelerelananuxatapi.pdf
    • http://dekibej.epizy.com/angularjs_tutorial_step_by_step.pdf
    • https://s3.amazonaws.com/piwanisaj/easy_definition_of_relational_database_management_system.pdf
    • https://s3.amazonaws.com/dazovosugev/angular_2_material_datepicker_date_format.pdf
    • http://gokadezuxama.rf.gd/46691161600.pdf
    • https://42e65457-ec34-4553-8979-78b6e302f774.filesusr.com/ugd/f1976d_592053527109454aab9bba2713de33dd.pdf?index=true
    • 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_off0000ea32.bin
8690a25639e2a21bae7e49c68a9dbee6847dcccd031b315264dfd505e2583b9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA32 5360 bytes
font_01_sfnt_off0000fca7.bin
2c943bf5147657e6734fba4d1de6765e7b1317c73ab550b9cb79fbf16c46b040		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA7 10276 bytes

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