Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd225644fba1f3e3…

MALICIOUS

PDF

91.9 KB Created: 2021-03-05 01:23:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: dbe8feff6af0daf10ced857e0d32a27c SHA-1: 7843feb9b9c3d4fe014c02ab20c1ff4ad42cf253 SHA-256: dd225644fba1f3e3b4baa0f0487b437ebd37c9049df911605f39a52a210455ae
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF link farm. One of the primary external URIs points to a domain associated with SEO content, and another critical heuristic indicates a mass external PDF link farm. The ClamAV detection and ML classifier also flag this PDF as malicious, likely due to its structure and embedded links designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/award?keyword=exercices+de+grammaire+francais+avec+corrig%25C3%25A9s+pdf PDF link annotation
    • http://servisvds.ru/jirinejusuzuxoturpyr.pdfIn PDF document text
    • http://1xbet-football.fun/girl_guides_ontario_event_calendarb88ky.pdfIn PDF document text
    • http://nikaold.site/alexander_amador_caldera_salasc7u79.pdfIn PDF document text
    • http://shopsupergood.site/294890097784i5ex.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/does_jumping_rope_build_abs.pdfIn PDF document text
    • http://jirenaxapibetig.scienceontheweb.net/nobifumorekudigitadu.pdfIn PDF document text
    • http://kittyplay.online/52893661178a4y1u.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/6088ef2f-a0ed-4ccb-be3d-086156b439cf/my_garbage_disposal_stopped_working_suddenly.pdfIn PDF document text
    • https://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_285e97fc13ab4427b657b12b24217682.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/6976271287.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/zelasorow.pdfIn PDF document text
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_2c8db1a4e4a145cfa48ea68d0f987418.pdf?index=trueIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_4a3241f3984545a7a44660b30e5626f0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8434d20-ad1b-4899-a875-0e9dad359063/lenovo_t430_docking_station_monitor_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/happy_new_year_song_2019_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/21537524066.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/consumer_reports_best_subcompact_suv_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/psychology_book_by_nagarajan_in_english.pdfIn PDF document text
    • http://zotubune.myartsonline.com/a_midsummer_nights_dream_summary_act_1.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C9 6440 bytes
SHA-256: a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c
font_01_sfnt_off000123bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BD 5672 bytes
SHA-256: 95a1b8a6d78ed14c426596323449eb61ae4700ddd9e51899efeffaae12587e31
font_02_sfnt_off000136c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C1 13176 bytes
SHA-256: c274981c9f5356467c481e573e14f15b79ff2f6d804b21d59a72282f2a9fbdf8

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