Malicious PDF — malware analysis report

Static analysis result for SHA-256 62480566b3a7e46b…

MALICIOUS

PDF

77.9 KB Created: 2021-05-13 04:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 62152f71e6db5a0b83afa69d16005ca4 SHA-1: 4aa551db29ec3b362515ad9f0dda87dff8b641fa SHA-256: 62480566b3a7e46bcc66fe1b68d85ed910be42a9190cfb60aad120f730af7687
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to 'jacksth.ru' which is flagged as suspicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/strik?utm_term=what+is+the+lucky+color+for+year+2021 PDF link annotation
    • https://cdn.sqhk.co/gaxokakijefe/93RyhiZ/bepibipowumomususisugom.pdfIn PDF document text
    • https://cdn.sqhk.co/gowamojon/8ggfbG0/fruit_cut_ninja_game_to_play.pdfIn PDF document text
    • https://cdn.sqhk.co/muzorefu/heW2pjc/kubimiretu.pdfIn PDF document text
    • https://cdn.sqhk.co/jagapifa/EBdwifX/custom_notification_sound_android_programmatically.pdfIn PDF document text
    • http://fidisop.22web.org/black_and_decker_cordless_hedge_trimmer_18v_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/wirubetena/btiaxAy/electric_wood_hammer_mill.pdfIn PDF document text
    • https://cdn.sqhk.co/ziriziwebu/Tyd88jg/marshmello_tiles_hop_beats.pdfIn PDF document text
    • https://cdn.sqhk.co/porekige/piebWen/collectible_toy_pogs.pdfIn PDF document text
    • https://cdn.sqhk.co/tofigidukug/C37GIig/2955171608.pdfIn PDF document text
    • http://sezuxopi.22web.org/test_de_apgar_minsa.pdfIn PDF document text
    • https://cdn.sqhk.co/turaxulefa/eSieUgi/bike_race_bike_blast_rush_descargar.pdfIn PDF document text
    • http://zufuruz.22web.org/samsung_2333hd_tv_stand.pdfIn PDF document text
    • https://cdn.sqhk.co/modonasuje/1hdrCij/bleacher_report_nfl_fantasy_mock_draft.pdfIn PDF document text
    • https://cdn.sqhk.co/dewozoju/YiatGPb/81295912081.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/palikuvexake/how_to_win_a_tiny_house.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/mariboketupozizoriteja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19390eca-983b-4953-a484-1de154a652e4/rawobeb.pdfIn PDF document text
    • http://piruxogijuba.rf.gd/81404557550.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/edipo_rey_autor_sofocles_resumen.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/which_brokerage_is_the_best.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e662e992-464f-4110-b2d6-991d27f2dab1/how_much_to_build_a_wordpress_website.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/expert_quotes_about_school_uniforms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebf85aa7-51cf-4b8b-bc48-3a5e035faeb1/simpson_scientific_method.pdfIn PDF document text
    • http://folijurojavagig.epizy.com/53575154170.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_off0000eec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC4 5476 bytes
SHA-256: 2893a69bc7c5e4897645315873fc5534690775bd68cc0bfcd658aaccb11b0918
font_01_sfnt_off00010177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10177 11432 bytes
SHA-256: 9acad77a4b3836286540dd5d66fcff3d27eeefa1991c3863d445c2ced9f96162

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