Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ca68433d0250db…

MALICIOUS

PDF

80.1 KB Created: 2021-03-30 05:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cf96e3473302d9ea8933e2f063d0716a SHA-1: 9c6dc98cfb14699361febd3820dc68abdc2b9f67 SHA-256: 84ca68433d0250db0a9471ac1edcbe183b7eaf971772044ae3eb7c5e5e07c7cc
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are presented as downloads for various content, including a game. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings confirm malicious intent. The primary attack pattern involves luring users to these sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/strik?utm_term=jack+and+the+beanstalk+story+book+with+pictures PDF link annotation
    • https://cdn.sqhk.co/fusunusol/fO2jcia/top_football_manager_2020_apk_mod.pdfIn PDF document text
    • http://watertea.space/6213237352poyoa.pdfIn PDF document text
    • http://babysampler.com/principia_discordia_portuguesj5dih.pdfIn PDF document text
    • http://golosa-spasibo.ru/ponuvafosulagojatuwapamufx4br.pdfIn PDF document text
    • http://shop-kid-toys.online/how_to_divert_panasonic_phone_to_mobile6bru5.pdfIn PDF document text
    • http://slmit.space/bottle_flip_3d_mod_apk_1._25e0pbl.pdfIn PDF document text
    • https://cdn.sqhk.co/pudamunipum/OggiieV/ophthalmology_cases_for_medical_students.pdfIn PDF document text
    • https://cdn.sqhk.co/tamupoto/lTghPVB/mortal_kombat_3_characters_ranked.pdfIn PDF document text
    • http://about-igsupport.com/zajugix9nhvj.pdfIn PDF document text
    • http://datingsexchat.site/oedipus_play_reviewunhtc.pdfIn PDF document text
    • https://cdn.sqhk.co/reretukida/lu3hjo5/wirarazag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/bad51f84-d788-4afa-aed7-e18d45ea0866/pefipezodobemolid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afdd1301-065a-44e7-bf5b-bf34cd05f8d3/parkour_definition_in_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5983cc9-0ca6-45b2-b658-c9fabea13086/81514192447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73704dbf-8f86-45d5-9ea6-3ce8c00db463/sandisk_clip_sport_driver_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2decb280-6a6c-4024-bb21-e6ac450b951b/tosavonokuxomapuxudujota.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/papuralilusukibipiji.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/streaming_app_android_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/big_bang_bang_bang_bang_ringtone.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1C 5428 bytes
SHA-256: 6abf4c21ab85024bee5c9c4dd982a38234dfc6869497074ba19d286e566ebd56
font_01_sfnt_off0000ff8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 10324 bytes
SHA-256: 3adf97d7b97901d90426da98cc4e9cf5fd3fdb0c785a62e5d9d3c4c8cd7b9152
font_02_sfnt_off000122e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E7 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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