Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af9b95391d8bf32…

MALICIOUS

PDF

78.7 KB Created: 2021-04-06 13:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 513df3bfa2e72793e2d65ce188e3ecbb SHA-1: 5fb3f82eff8a8c1f4af47d357712c9a628539ceb SHA-256: 1af9b95391d8bf322518b36621da716d097e7ca6d227c1cbbdf76af6d1877502
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary link pointing to a domain associated with phishing. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to create a link farm for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/award?keyword=asymmetric+phase+transfer+catalysis+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/sajezife/esmo_guidelines_2018_rcc.pdf
    • http://zorarizasodefa.epizy.com/wevuke.pdf
    • http://nufewaruxemo.epizy.com/exceptional_c_free.pdf
    • https://s3.amazonaws.com/rimejiguvif/cules_son_los_derechos_humanos.pdf
    • https://s3.amazonaws.com/datarofapakil/airplane_landing_video.pdf
    • https://uploads.strikinglycdn.com/files/c7bf5d71-cc3f-4e6e-b49a-03487408fb74/how_to_use_a_xbox_controller_on_dolphin_emulator.pdf
    • https://s3.amazonaws.com/kotodur/vubexapif.pdf
    • https://s3.amazonaws.com/savukojubusum/cnn_ratings_drop_after_mueller_report.pdf
    • https://s3.amazonaws.com/somamere/hip_hop_charts_2008.pdf
    • https://uploads.strikinglycdn.com/files/ed37424a-46d6-4432-8109-2f3ac8ea033d/kung_fu_hustle_english_dubbed_full_movie.pdf
    • https://c9977776-9e37-4432-9eae-e541147807da.filesusr.com/ugd/bb6cc6_a8b0019f54054bc8a8c80c48ca4e1d79.pdf?index=true
    • https://fc9a8e44-b853-4378-b933-957c6fa9ceda.filesusr.com/ugd/1da781_18903b137fe1439380e45822ad0576d7.pdf?index=true
    • https://s3.amazonaws.com/wupixufekijax/easy_reading_comprehension_worksheets_for_kindergarten.pdf
    • https://uploads.strikinglycdn.com/files/85c81c0c-91d4-4930-b5d8-f29c1eebae9b/ipega_9023_to_pc.pdf
    • http://lifazurufinu.epizy.com/ibps_po_2020_approximation_questions.pdf
    • https://s3.amazonaws.com/duzexefemosaxe/zagugop.pdf
    • https://s3.amazonaws.com/serogajugomiji/rejalex.pdf
    • https://s3.amazonaws.com/ropuba/free_printable_blank_birthday_card_template.pdf
    • https://s3.amazonaws.com/folexapurilowe/ruwupu.pdf
    • https://s3.amazonaws.com/lerezazo/79268104464.pdf
    • https://s3.amazonaws.com/pisedij/xewuzebadafexetowu.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_off0000e81b.bin
00c30fd85ae9dab44f5f9a632cc334ab8f55305606e7c1b85baca223856d4362		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE81B 5164 bytes
font_01_sfnt_off0000f981.bin
3c945b46f3e95141f35ff06e8d3e72492a7d30d7e7552c736788b00ef7b9882c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF981 11228 bytes
font_02_sfnt_off00011f2e.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2E 4324 bytes

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