Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee765d9befda8886…

MALICIOUS

PDF

71.9 KB Created: 2021-03-09 02:50:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e9228f55ca8bba9cb1be5be3c14c5af5 SHA-1: 7f79e2a8446855096ec1ef966ba92749b2a47939 SHA-256: ee765d9befda888634317071ca94357d88d29b1213c40c006b0a12aef48471a8
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a prominent one pointing to 'xajibur.ru', suggesting a redirection to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of using disposable hosting for malicious links.

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 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://xajibur.ru/123?utm_term=connect+math+user%2527+s+guide PDF link annotation
    • http://bbcua.site/fizolokomuwajumeja8g7y6.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/nokuvojobevelenituxu.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/eFhfUgj/dokipumimilibig.pdfIn PDF document text
    • https://cdn.sqhk.co/dutigimomana/ihibjjj/american_drones_size.pdfIn PDF document text
    • https://cdn.sqhk.co/rodisukipi/hjHQaig/free_woodworking_plans_diy_projects.pdfIn PDF document text
    • https://cdn.sqhk.co/bilexodofose/9zmhccv/felefikazalekatafoti.pdfIn PDF document text
    • http://unonatur.space/rajavaxixudirni5w.pdfIn PDF document text
    • http://nickned.me/ateten_gmlek_kitab_indirmksb8.pdfIn PDF document text
    • http://bepelisufozasep.mywebcommunity.org/cautery_machine.pdfIn PDF document text
    • http://apparentlyopt.com/kikuyu_bible_appx1z5e.pdfIn PDF document text
    • https://cdn.sqhk.co/jokufemij/dichcZg/sivonugimaxubupijuzo.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/5Ig4he7/pubg_mobile_metro_royale_game.pdfIn PDF document text
    • https://cdn.sqhk.co/datolabevev/gdPjehf/wutigiwenewipugalusuta.pdfIn PDF document text
    • http://ketousa.site/sodafurovuzayhfc7.pdfIn PDF document text
    • https://cdn.sqhk.co/tovasodoj/igdOjca/58412478526.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/cf153428-e47e-4270-a390-64c75a37b0da/depif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d11aa439-bec6-40c0-ae56-93649841914b/how_many_calories_in_5_dunkin_donuts_munchkins.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d5eade1-c9b3-40c5-b2d5-8b967e9ae632/sony_dvp-sr510h_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/cursos_de_ingles_gratis_en_linea_para_nios.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/rorizuluxujolasor.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_off0000da46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA46 5260 bytes
SHA-256: b893634194ef6ce2081b58b3efd75a272b211a5549e593e78dd421c0cf138052
font_01_sfnt_off0000ebf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF8 11540 bytes
SHA-256: b5a30904d38dc5153c279c2b250cb46386fbe658944e96ac009493711837c522

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