Malicious PDF — malware analysis report

Static analysis result for SHA-256 4763b86f444c717d…

MALICIOUS

PDF

83.5 KB Created: 2021-04-20 16:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e98cff052cfea0a179500638cd79b1a9 SHA-1: 5f1733e6863a2cabc74ed9eaf3e0a16cc473286e SHA-256: 4763b86f444c717d7affe41ef21279a873b20c796cb8bcaa97a22149097f84f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/strik?utm_term=machine+learning+a-z+udemy+free+course PDF link annotation
    • http://expo-kit.ru/48971186508kb1zd.pdfIn PDF document text
    • http://cz-nitrof.website/wuziveluwebiwirufaj8ues2.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/vgThcic/7_level_156.pdfIn PDF document text
    • https://cdn.sqhk.co/pugirunosamo/UbgfHhh/stickman_soccer_2018_kits_serie_a.pdfIn PDF document text
    • https://cdn.sqhk.co/sunaxidida/jahgljj/snake_xenzia_1997_rewind_pro_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nivavepe/ehhibig/rivak.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/jheDRjj/20900399111.pdfIn PDF document text
    • https://cdn.sqhk.co/zulatobi/bliaFbm/frontline_commando_world_war_2_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fowijuseziju/jdibCja/microsoft_word_checklist_template_download_free.pdfIn PDF document text
    • https://cdn.sqhk.co/jupufopil/gi7ghhd/jiwenexinafewijerevevo.pdfIn PDF document text
    • https://cdn.sqhk.co/sevigexew/ahctigy/brain_surfing_2_level_74.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/uhaPgjX/fire_alarm_testing_report_format.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/45058919890.pdfIn PDF document text
    • http://jafafikano.epizy.com/9322191803.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/zusesuzawulex.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/android_backup_texts_to_sd_card.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/will_there_be_a_captain_underpants_season_4.pdfIn PDF document text
    • http://jilerixam.epizy.com/25041760602.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/lead_acid_battery_charger_circuit.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/parasitic_diseases_in_humans.pdfIn PDF document text
    • http://nawopadawejiw.epizy.com/what_religion_dominates_japan.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/who_is_considered_a_native_american.pdfIn PDF document text
    • http://pabipinipimano.epizy.com/comcast_wireless_cable_box_price.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/jusixakifenuremumuvexam.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBB 5624 bytes
SHA-256: 75c177a848ea0d169c5322b48996c11addc9cfb154dd578b70048a883bc41d3e
font_01_sfnt_off000100d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D4 11612 bytes
SHA-256: cd1813a9114626777e45e2f8f61f7a0e0876c0b7f4037903dfd05e00508712c7
font_02_sfnt_off000128c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C2 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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