Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3bb40ca0e2b6ff8…

MALICIOUS

PDF

80.4 KB Created: 2021-04-07 11:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6aaad59b6ff13ede6fcfa6abba7c8167 SHA-1: 9ef43f47261f5c2c0d211e2b9ce3ae68f675dc33 SHA-256: b3bb40ca0e2b6ff81a3de1eca76a9af15d18f71ea03c41f38ccd7a3a6411cd65
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML score. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick the user into installing malicious software by pretending to be a necessary browser update or plugin. The presence of numerous external links, many pointing to PDF files, suggests a link farm or redirection mechanism to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://xezojetit.ru/123?utm_term=acrobat+2019+dc
    • http://jamisixed.22web.org/ancylostomiasis_pada_anjing.pdf
    • http://xojitufos.66ghz.com/centrifugal_compressor_inlet_guide_vanes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/tuxenipup/xuxobafesijakubanebavenur.pdf
    • https://s3.amazonaws.com/pewebopufupe/harry_potter_wands_amazon_canada.pdf
    • https://s3.amazonaws.com/jagux/avena_arrollada_informacion_nutricional.pdf
    • http://xumolax.rf.gd/corpse_bride_piano_duet.pdf
    • https://s3.amazonaws.com/lowuwofuxali/wowib.pdf
    • https://s3.amazonaws.com/bulujono/what_happens_to_ahsoka_after_season_7.pdf
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_a4a190379e8c420cbd6dbea476aeae61.pdf?index=true
    • http://katosijuxemewex.rf.gd/javascript_cancel_form_submit_onsubmit.pdf
    • http://fezesotufixodow.epizy.com/optimization_algorithms_in_machine_learning.pdf
    • https://13dbc848-c95e-4197-a439-3ae2050b6ee2.filesusr.com/ugd/46bbe5_7cbe01cdaffd41fab65e3236f640faab.pdf?index=true
    • http://fevirafi.rf.gd/17420298395.pdf
    • http://zasegusof.epizy.com/spoken_english_video_lessons.pdf
    • https://s3.amazonaws.com/metubevozisul/how_to_clean_lg_inverter_direct_drive_washing_machine.pdf
    • http://nibudomatimemi.rf.gd/nawijiletorimu.pdf
    • https://s3.amazonaws.com/lemefofutomapox/60713467065.pdf
    • https://s3.amazonaws.com/fejififimaketo/zidozokafusina.pdf
    • https://s3.amazonaws.com/zugutixe/50575544854.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f06a.bin
57baca067398efafee8231a08d66d32f49a018ef3efdcc45bb444a4f914183dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF06A 4852 bytes
font_01_sfnt_off000100e6.bin
cc1c548520b55062a3f02cbc14bf34a316406a1f572942d1bfe2d71a3b361ff8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100E6 11088 bytes
font_02_sfnt_off000126ab.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126AB 4324 bytes

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