Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e970090b7a66aa1…

MALICIOUS

PDF

83.3 KB Created: 2021-03-30 06:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fe5ec1b1649ada059b09ca6ad83bd8d3 SHA-1: c266fe14e0a63629306ea24aaa54a5f10505469a SHA-256: 3e970090b7a66aa1e1fd06b39c06e5524d20a4a39f57b5d304bb524e74a2e772
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL leading to a site that appears to be a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting and multiple distinct hosts, suggesting an attempt to obscure malicious activity. 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

  • 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 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://jacksth.ru/award?keyword=curso+de+frances+gratis+pdf+descargar PDF link annotation
    • http://pugisapi.mypressonline.com/rokoxaselino.pdfIn PDF document text
    • https://cdn.sqhk.co/wenovasew/6ihrVnq/fidget_spinner_mod_apk_1._3.pdfIn PDF document text
    • https://cdn.sqhk.co/kapidibewomu/hfigdjj/bejuvezatajejewotasani.pdfIn PDF document text
    • http://kijofizovurisos.medianewsonline.com/calendario_mundial_rusia_2020_horario_mexico.pdfIn PDF document text
    • https://cdn.sqhk.co/baresupujar/icVhiba/94300406682.pdfIn PDF document text
    • http://zabovawupe.mypressonline.com/league_of_legends_patch_10.24b.pdfIn PDF document text
    • https://cdn.sqhk.co/midipijikami/cwT6Cor/36624621552.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/byly3he/vietnam_era_music_60_s_70_s_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/duwenaxiseve/Ascjdqe/strikers_1999_mod_apk_rexdl.pdfIn PDF document text
    • http://xusetifawog.mypressonline.com/6254547051.pdfIn PDF document text
    • https://cdn.sqhk.co/lisesemafo/hfUvEdE/russian_alphabet_pronunciation_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/kototokim/qjevibN/mr_love_queen_s_choice_shaw_x_reader.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/jq1Onjg/dental_assistant_courses_cost_uk.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/te_mueves_tu_lyrics.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://s3.amazonaws.com/fixararololu/25569422177.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/avira_antivirus_security_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58e596da-65f0-45dc-a0b8-c2998b3f56a1/how_to_reset_the_maintenance_light_on_a_2005_honda_odyssey.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/atami_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/the_courts_of_heaven_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6b20401-25b4-4ee8-9520-1ebcf6ea1f23/fixukina.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/mountain_horse_polar_breeches_size_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF653 5196 bytes
SHA-256: 5ebf7afecf8baf7e4b517ad2017ac809f9ddc44bac6c632bf6280d42ad49f974
font_01_sfnt_off0001080f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080F 12468 bytes
SHA-256: 2fef8db4a0256aaee7bd27724329224b5b8d6823b15077c25c442ce847437550
font_02_sfnt_off00012fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE9 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3