Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e82de516f5075f…

MALICIOUS

PDF

75.7 KB Created: 2021-02-26 07:43:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6aff467682725f8788dc15237c800599 SHA-1: c9d49d2f686e358e64806ccf27995d4be0f848fe SHA-256: a4e82de516f5075f3cf86eaad9ab54d412dbcf3179c80ac9c6c4d68800a74fdb
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. The embedded URLs point to various domains, suggesting an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://seumenha.ru/123?utm_term=librecad+or+freecad PDF link annotation
    • http://dumubemajizukov.medianewsonline.com/how_to_use_ly_adverbs.pdfIn PDF document text
    • http://orbitan.fun/a_series_of_unfortunate_events_the_end_bookmo0y0.pdfIn PDF document text
    • http://podjem2.club/69880845416d1129.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/33373187469.pdfIn PDF document text
    • http://complect-tech.ru/savita_bhabhi_google_drive7wye0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384307/normal_5fcef56770e41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370304/normal_5ff5315d17f73.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/idjijhb/libuliwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444882/normal_60215464db496.pdfIn PDF document text
    • http://italia-doc.space/Aditi_gupta_y_harshad_chopra_estn_cw0ziq.pdfIn PDF document text
    • https://cdn.sqhk.co/kadefowuvun/gcHgdTE/70131963398.pdfIn PDF document text
    • http://delinapod.mypressonline.com/hp_elitedesk_800_g1_mt_desktop_pc_power_supply.pdfIn PDF document text
    • https://cdn.sqhk.co/nijusukelok/bghbCmG/1995842558.pdfIn PDF document text
    • https://cdn.sqhk.co/navotezive/pDmZijy/union_gospel_press_sunday_school_lesson_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/lanuniwa/ZOzCJjc/f1_racing_games_free_download_for_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/6NJMwjc/linkedin_app_for_windows_10_free_download.pdfIn PDF document text
    • http://rijewomel.scienceontheweb.net/6112980726.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/jdgcjgh/vogefav.pdfIn PDF document text
    • https://cdn.sqhk.co/juwafajem/gdxhjmr/99692670438.pdfIn PDF document text
    • https://cdn.sqhk.co/fagisuxupinu/igcgjDO/55841902651.pdfIn PDF document text
    • https://cdn.sqhk.co/puburasar/mhbhagc/luvapiwazabawimaxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rogofideb.onlinewebshop.net/does_uppababy_go_on_sale_on_black_friday.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_off0000ecce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCE 4888 bytes
SHA-256: 03bfc7eea8b095af822787f3ebe725742c28b224112be19b60c20b8ffd81aaaf
font_01_sfnt_off0000fd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7E 10784 bytes
SHA-256: 24fa03abb502d9b65b5d29af37347b8deb35e64da3c984554826a356d45700d2

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