Malicious PDF — malware analysis report

Static analysis result for SHA-256 e72bb24ece4519f6…

MALICIOUS

PDF

86.5 KB Created: 2021-03-10 03:04:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: eb7e0b9a397629ad7c3ef535efaaad1d SHA-1: 7ba529055aa5219f5a7e1d77b5b9be4788449d96 SHA-256: e72bb24ece4519f6b7820c817849ad962fe9fa8f22550689fd1097fc4a6f657f
186 Risk Score

Malware Insights

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

This PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristics point to the use of embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://baarspo.ru/award?keyword=beethoven+sonata+appassionata+pdf PDF link annotation
    • https://judadumoxa.weebly.com/uploads/1/3/4/7/134718892/wozegomupesavog.pdfIn PDF document text
    • https://dafizigupiteg.weebly.com/uploads/1/3/4/4/134492389/574f563450211.pdfIn PDF document text
    • https://cdn.sqhk.co/baxemazisod/bdihCK4/pathogen_meaning_simple.pdfIn PDF document text
    • https://nawenakugod.weebly.com/uploads/1/3/6/0/136048640/nuvaxekivuxuka_wopofujamasovob_dunakolu_kimilumivanik.pdfIn PDF document text
    • https://cdn.sqhk.co/kewukapugino/Did9gc3/bezazomidalugekafimov.pdfIn PDF document text
    • https://cdn.sqhk.co/kinerufi/jhjjWia/13382585162.pdfIn PDF document text
    • https://cdn.sqhk.co/luwosera/ghMUBI2/zapowibatu.pdfIn PDF document text
    • http://velavedi.iblogger.org/babbel_spanish_apk_cracked.pdfIn PDF document text
    • https://leniwexobopusez.weebly.com/uploads/1/3/4/7/134713406/b9ce95e12339.pdfIn PDF document text
    • https://cdn.sqhk.co/desiruzag/TgGhdhb/use_better_camera_for_zoom_mac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_cadcae56b7f8430aaa42a0a8f33a0019.pdf?index=trueIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_98f33a2d96064ae9a4d82c318ae0bd7a.pdf?index=trueIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_56cb500ebb524157b03636c2b59d33f3.pdf?index=trueIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_31f9c21bc3a34a4eb7bd709df1329f28.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/68aa18c5-fed4-44b8-8850-095be97b9dd0/12940238307.pdfIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_ca336a5079bc449ea715ce38e31a7da6.pdf?index=trueIn PDF document text
    • http://jemudizibumak.epizy.com/cabelas_dehydrator_owners_manual.pdfIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_443b8f0b895f40b0aa396239fe911419.pdf?index=trueIn PDF document text
    • http://tofodubigar.epizy.com/cuanto_equivale_5_pies_y_3_pulgadas_en_metros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63d9f66c-47f1-4ac2-a959-6ff2eaa38c54/pagututefulid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10aa662b-1c0c-4923-b60d-d8a85cd9fbc2/tippmann_98_custom_barrel.pdfIn PDF document text
    • https://584dc5e1-4449-4bca-b3d9-d0e1fa08a972.filesusr.com/ugd/185caa_f69f9e7773dd4206b6ad9ca9702bf7da.pdf?index=trueIn PDF document text
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_6ec9b6982fb04bcb94ca09fd2f4b1f70.pdf?index=trueIn PDF document text
    • http://vedavapum.epizy.com/7367210562.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f29eb5ba-6a65-4c34-94eb-97481e946dc6/nefodikedibumemipidoz.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_off000105e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E5 5108 bytes
SHA-256: 6b559fde681ca4db0d610bb6b099bac7e5d6799ce1fbe8614e88b28be48db61a
font_01_sfnt_off00011757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11757 17312 bytes
SHA-256: 3641b9d833b943fbb68918896eaac641eea19c4fe34d771f956ef6041009a99f