Malicious PDF — malware analysis report

Static analysis result for SHA-256 5934b67dae125533…

MALICIOUS

PDF

83.0 KB Created: 2021-03-10 12:38:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d63d76737e58f539ece2abb4edb1174a SHA-1: 47205608e1820765883be4b7271408a9709d6d65 SHA-256: 5934b67dae125533d22f54832eddd3117ec96d13b9a5a95f343de21a2659ddb7
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The primary malicious URL identified is https://kuzutuzo.ru/wix?keyword=hip+hop+music+demographics, which is likely used to redirect users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=hip+hop+music+demographics PDF link annotation
    • https://fusopozosasotex.weebly.com/uploads/1/3/4/4/134477759/aaa1a6.pdfIn PDF document text
    • http://itclick.info/gelubiwuvapasulotalerodig3k1d.pdfIn PDF document text
    • https://sidutoxa.weebly.com/uploads/1/3/4/8/134886075/febijadexumo-nasufivobapo-rorejevekiteru-jalifunududi.pdfIn PDF document text
    • http://ipai.online/how_to_install_hampton_bay_ceiling_fan_wall_controlczpeo.pdfIn PDF document text
    • http://kushtanash.ru/saxon_math_2t9y58.pdfIn PDF document text
    • http://lorenbayi.com/98918081216ylrzm.pdfIn PDF document text
    • http://toteganutiv.66ghz.com/pejonufepimas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff1e087e-4c7f-4694-ae26-83b88e3cd365/terogiwo.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/infographic_ppt_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f401e36-cb38-4511-aaf8-00ca48f7d7c2/fluent_python_clear_concise_and_effective_programming_2nd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aedadad-3953-4f3f-875c-5788a46a5ca4/cost_volume_profit_analysis_example_problem.pdfIn PDF document text
    • http://dinaxeziva.rf.gd/55094529840.pdfIn PDF document text
    • http://vugoban.epizy.com/guideposts_writing_contest_2018_winners.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/bwv_1013_flute.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/line_cutting_practice_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/70862480216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d426b3cb-4ffe-4c52-9746-42033776abd5/how_to_export_blender_to_unity.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/vagonawugakonezitolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/981f93ce-d19d-4384-8bf4-1cb249541678/can_i_download_google_maps_on_iphone.pdfIn PDF document text
    • http://dadedejesewoji.epizy.com/what_baby_names_will_be_popular_in_2030.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cc60215-787a-4838-953a-7b9f8c0d7816/banowazizobiposonupevene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc0811a0-21bc-4ce4-83b4-c7e72f474872/what_is_culture_journal_article.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ac19f13-6576-46c6-bd07-f2a399e32ec1/88726506085.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cac63e8-b912-4e03-a51f-10eeeeea0277/lowrance_elite_3x_ice_transducer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d229caa6-cd43-47a4-a50b-1359fd5a0b5c/70947214680.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10819 5416 bytes
SHA-256: d212487379a6d7daf30442aa8fe3a0c71821daa64f881fbc0ce10e0b14b139f0
font_01_sfnt_off00011a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A58 10460 bytes
SHA-256: 5b144d70e1df131ce2fe9146dd34ea329824a00842b250ea8966fc8009d4dde2

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