Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f406490a638828…

MALICIOUS

PDF

75.1 KB Created: 2021-04-01 23:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0f67713ff14ed846f2cdced028cf93fb SHA-1: 20afc114329cbe7629c08a9406082aecce4dec6c SHA-256: a0f406490a6388282eaa2ed4c380ed5f2637154e892b35569f7c7f4909de457c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant heuristic firing indicating it's a link farm hosted on disposable domains. One prominent URL, 'https://jottigo.ru/strik?utm_term=effective+communication+skills+examples', is identified as a potential phishing or malware distribution point. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jottigo.ru/strik?utm_term=effective+communication+skills+examples PDF link annotation
    • http://zibikudupe.mywebcommunity.org/61907323403.pdfIn PDF document text
    • https://cdn.sqhk.co/givikofuf/c7jjAie/the_walking_dead_season_one_apk_data_rexdl.pdfIn PDF document text
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/remozij_kelezedivuwe_kujegubiso_tolobexefusut.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/he1ja4B/guitar_ringtone_wallpaper.pdfIn PDF document text
    • https://naxujurimarawe.weebly.com/uploads/1/3/4/6/134640244/7001934.pdfIn PDF document text
    • https://cdn.sqhk.co/takularozo/djgifhi/griswold_christmas_house_location.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/IiaBvgZ/gangmasters_licensing_act_2014.pdfIn PDF document text
    • http://worozoxiw.sportsontheweb.net/bank_management_and_financial_services_9th_edition_ebook.pdfIn PDF document text
    • https://cdn.sqhk.co/kasuvapexal/gdigo6M/baixar_videos_engracados_para_status_do_whatsapp.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/liguwubore/nawugiminuvodumogi.pdfIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_35d7daf1df7b42d996d1efb1c0af529e.pdf?index=trueIn PDF document text
    • http://zipemoluligera.myartsonline.com/tobakivanuwozugodesi.pdfIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_19715886e0e745d28c7cb884b5254191.pdf?index=trueIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_2b14f7467ac946f28453409cc1a1638d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/549a2d64-f37d-4ee7-8d64-b31a692bee94/tv_ears_dual_digital_wireless_headset_system.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/cecenka_sac_formasi.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/anniversary_images_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/how_many_scoops_of_coffee_for_6_cups_cuisinart.pdfIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_b152cb4cc27348288ecbd200ea9ecf04.pdf?index=trueIn PDF document text
    • http://duxepivol.myartsonline.com/cantigas_medievais.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d114fc82-ea03-4d2a-ae18-8766988b80f7/how_to_turn_on_a_split_ac_without_remote.pdfIn PDF document text
    • http://mobukug.myartsonline.com/mathematics_12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3bca843-3e0c-46c8-bd46-ebc437b1f63f/ms_excel_formula_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d9d3bdd-56be-4b51-ad44-ae3dd7c640cd/instruction_manual_for_butterball_electric_turkey_fryer_professional_series.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/newasaru.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_off0000e88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88E 5216 bytes
SHA-256: 170945d0f56e806b0c5797b0e04efb5c6203eecfc6b42e115b609775487afd67
font_01_sfnt_off0000fa4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4E 10628 bytes
SHA-256: 6ca5132d20a88d0d50336994f9368ae5e0482b314e60c6fcfba722f481d47e9b