Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c25b9adb6878230…

MALICIOUS

PDF

73.5 KB Created: 2021-03-27 14:59:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 23b6dbbf0a3660b365df10aea7a795ca SHA-1: d462a04ee74c50b728a1318a120cd0c603761b5e SHA-256: 4c25b9adb6878230c3400c5e3591713ce4e0e3279d111ebe01a822257ec7972a
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous links on disposable hosting suggests a link farm designed to distribute malicious content or phish for credentials.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=local+anesthesia+pdf+download In PDF document text
    • https://lulitetuxopibol.weebly.com/uploads/1/3/1/1/131164377/jejofezezewakebira.pdfIn PDF document text
    • http://ita-yog.space/tedigubumobazawiduxobrlmv.pdfIn PDF document text
    • http://instapriz.online/94786451883i43fr.pdfIn PDF document text
    • http://suvolupijiro.mygamesonline.org/download_abbyy_transformer_3._0_free.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwutelurew/2jbhfic/argentina_vs_england_world_cup_mexico_1986.pdfIn PDF document text
    • http://snatural.space/bangla_movie_mp4_song_download_a_to_zccxfq.pdfIn PDF document text
    • http://kedepoba.sportsontheweb.net/the_future_of_life_quotes.pdfIn PDF document text
    • http://fidesuwuranotif.getenjoyment.net/55443941704.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479222/normal_5fdcb4d48cd0a.pdfIn PDF document text
    • https://cdn.sqhk.co/fogibadeku/M9hjLgj/pinball_arcade_game_online.pdfIn PDF document text
    • https://lulefimoka.weebly.com/uploads/1/3/2/7/132740328/3748095.pdfIn PDF document text
    • https://fisupipegapug.weebly.com/uploads/1/3/4/5/134515512/magejilejivojatijofu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456982/normal_6046a14f33452.pdfIn PDF document text
    • https://cdn.sqhk.co/lokovipazal/jbjegf3/regal_cinemas_14_summer_movies.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379848/normal_6011839fd6639.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369656/normal_602a0aad46a4c.pdfIn PDF document text
    • http://biditudoti.22web.org/33655351428.pdfIn PDF document text
    • http://perakaganiw.iblogger.org/how_to_fly_a_dji_drone_for_beginners.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suvalomimo.atwebpages.com/small_gods_audiobook_download.pdfIn PDF document text
    • http://malejuvi.epizy.com/muletajolivitujo.pdfIn PDF document text
    • http://bopebewi.epizy.com/karol_bagh_new_delhi_weather_report.pdfIn PDF document text
    • http://samesesodore.onlinewebshop.net/luganda_bible_download.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_off0000e255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE255 5180 bytes
SHA-256: 21b56a085adde62be0cc1dab29b18ab4abf613068cd05637afa2d0684c81dc77
font_01_sfnt_off0000f40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40B 10848 bytes
SHA-256: 8392b586678bfaefd46fa59dc6ad4b7491b8644034c29efd1224617c97e20c34

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