Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e691cd840f829d1…

MALICIOUS

PDF

88.7 KB Created: 2021-03-15 10:32:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 51da7ff6bb1be3e408d3300e334aebdb SHA-1: db4ac6e9a2c92ef398976dfe75ad3a1aa13e311a SHA-256: 5e691cd840f829d11868815d087591d936a47a49c4793a2a35d98b871e89e911
186 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 SEO spam or phishing. The primary malicious URL, 'https://baarspo.ru/award?keyword=node+js+book+pdf+free+download', is presented as a free download for a Node.js book, a lure to attract users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://baarspo.ru/award?keyword=node+js+book+pdf+free+download PDF link annotation
    • http://bijopesenof.iblogger.org/types_of_houses_worksheet_for_grade_2.pdfIn PDF document text
    • http://jijoxep.getenjoyment.net/60912309011.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/buxudigexuni.pdfIn PDF document text
    • http://xunogivovere.22web.org/interactive_smart_board_software_free_download.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/deloxipopu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/000e7300-91dc-44e4-a02c-0907fb52b1ce/31105514990.pdfIn PDF document text
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_092ccda02f70484eb76a560be077e3fe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/96ab37f1-1f61-4ce6-b219-d29033ccede8/gopro_hero_4_silver_update_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c52b5a4-8b06-413e-aa8c-c0300e6944d5/how_to_turn_on_american_standard_jacuzzi_tub.pdfIn PDF document text
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_07162c93686b4ce0ab770eb01762c9a1.pdf?index=trueIn PDF document text
    • https://5b3500e9-40b4-440a-9ada-171ed8bcf4c9.filesusr.com/ugd/7820d0_b22fa5e6318645ec941fd6b3f384160b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4af6c00b-101c-46a6-9cc7-721688c6024d/91612241149.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3304f6f9-5fee-4c2b-9cfe-b30fcc7d8078/53223722063.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb058190-e037-47bd-9190-27bb0c19ab62/95405121878.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/19097416733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abe9bf63-3894-47f7-9268-9b2170aafc0d/29676249616.pdfIn PDF document text
    • https://54e283d8-6946-47af-b6e3-c78582312647.filesusr.com/ugd/22cd47_aba7ef93028c47118ae74d0d17631c12.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fapaga/49338871306.pdfIn PDF document text
    • http://pugijomo.epizy.com/icloud_unlocker_zip.pdfIn PDF document text
    • https://c4a0f302-b060-43a0-af10-a0364da5eca7.filesusr.com/ugd/c6d327_4cd8880c1667472ea4c151b49b5533e8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fed8896a-95a7-4d2c-9cbc-a419c49145dc/nuxusubip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bf09a58-1087-46d9-a8b8-de34d1cae6d6/88594931500.pdfIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/wotajirugulugijematado.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80B 5036 bytes
SHA-256: 92a4102b769d30ba24d7b1194c13aab9652aa780b1b4793790be61be6a304981
font_01_sfnt_off00010949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10949 11452 bytes
SHA-256: f820a39fc57c7f32985cfbadeb8a0a3d04608f3ea94fcf72845335610c62eb73
font_02_sfnt_off0001304e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304E 16480 bytes
SHA-256: cfb81015ccc48e34430eefe4798d2ceb6eb399c3071117bcf8196ad78feeec32
font_03_sfnt_off00014653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14653 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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