Malicious PDF — malware analysis report

Static analysis result for SHA-256 240f66c6f818dd13…

MALICIOUS

PDF

87.0 KB Created: 2021-03-24 02:37:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: eb644805e3ac018cbdcb68238943739c SHA-1: 108e95fd50f349d5251f6b8974404eca824acd43 SHA-256: 240f66c6f818dd135a9d1ea92a61b10d81c34470a2a4c27d2ef4d623df0d333d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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.
  • 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://crophysi.ru/wix?keyword=microsoft+mathematics+add-in+64-bit+download PDF link annotation
    • http://wedidizelajat.mypressonline.com/bolt_and_nut_torque_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/nivavepe/iAhjrjh/history_vault_annual_subscription.pdfIn PDF document text
    • https://cdn.sqhk.co/banamasuvaj/gEidehe/clash_of_clans_mod_apk_hack_2018_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vagizabibo/jhiaidz/knight_solitaire_2.pdfIn PDF document text
    • https://cdn.sqhk.co/retagigimusa/ghaagdS/best_crafting_games_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/bipaneri/bjgNKhi/tumblr_apk_for_android_2._3._6.pdfIn PDF document text
    • http://wejaduz.mypressonline.com/basics_of_affine_geometry.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarasam/iecgjgh/romantic_couple_stickers_for_whatsapp.pdfIn PDF document text
    • http://tozofuji.scienceontheweb.net/lowrance_hds_7_gen_2_cover.pdfIn PDF document text
    • http://bidetoluji.getenjoyment.net/wevumizixosivo.pdfIn PDF document text
    • https://cdn.sqhk.co/bikulatitaxe/0a0ifje/55451980279.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/vuzotisenixava/soundcraft_ui24r_tutorial_espaol.pdfIn PDF document text
    • http://xufoziminep.onlinewebshop.net/xenotimavebiwemuke.pdfIn PDF document text
    • http://jaxunukologefis.onlinewebshop.net/mahabharata_amar_chitra_katha.pdfIn PDF document text
    • http://tevaluzax.atwebpages.com/basic_principles_of_graphic_design.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/lexus_350_rx_2021_for_sale.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/how_to_learn_hindi_basic_words.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/avancemos_3_workbook_answers_page_151.pdfIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_73b16a9cb41349fd871fc0ec15e3c2fe.pdf?index=trueIn PDF document text
    • http://gixarewujedel.atwebpages.com/46055368526.pdfIn PDF document text
    • http://purewowesajumu.myartsonline.com/python_data_analysis_practice_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/65235403965.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/android_app_development_course_fees.pdfIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_b682dfdbcb214413a8b47845f1172d13.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11649 5772 bytes
SHA-256: 490f110cdf6f330c6a48e75ad03358b0652f5b3d33bba25b945309107c3c3937
font_01_sfnt_off000129e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E9 10580 bytes
SHA-256: fd0309991dd002616cd0d542782969785e086b94faef2ff2b4c3605ab24c99fd