Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c24a3e2b258210…

MALICIOUS

PDF

82.5 KB Created: 2021-05-11 19:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 0e5fc74f413efaeee89fa30fc1fa71bc SHA-1: 0bd115644c49707140cca1ef977a978c5f6803d0 SHA-256: 84c24a3e2b258210f1cc6ffbec012c9ed24dc2150aaa280c5ec852c05a7dc85b
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The presence of a 'download' button lure further supports this. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fokemale.ru/strik?utm_term=the+zookeeper%2527s+wife+full+movie+download PDF link annotation
    • https://cdn.sqhk.co/xezojutatow/4Tihpid/baby_yoda_stickers_etsy.pdfIn PDF document text
    • https://gewolurigidanax.weebly.com/uploads/1/3/1/3/131383018/9357417.pdfIn PDF document text
    • http://cadenalia.com/kitchen_cabinets_plansrvdf0.pdfIn PDF document text
    • http://goodsun.fun/human_body_systems_worksheets_7th_gradeqn3n6.pdfIn PDF document text
    • http://reduslim-italiaoficial.site/what_length_barrel_for_224_valkyriecglby.pdfIn PDF document text
    • http://50off.pro/sfsu_dorm_priceshz7pb.pdfIn PDF document text
    • https://cdn.sqhk.co/wikelere/dG6wnha/advertising_agencies_nyc_jobs_entry_level.pdfIn PDF document text
    • https://cdn.sqhk.co/zelosoza/agci1Xc/41346393150.pdfIn PDF document text
    • https://sefoxobifi.weebly.com/uploads/1/3/6/0/136093232/81411c603.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/jeibXFy/pediatric_infectious_disease_doctors_nyc.pdfIn PDF document text
    • http://cesaregaspari.com/fox_wallpaper_iphone_6_cute3f15h.pdfIn PDF document text
    • https://fawimerena.weebly.com/uploads/1/3/4/6/134630635/8266804.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/331c3026-7e87-4d46-89f6-733ea9148ee7/how_much_does_an_engineering_manager_make.pdfIn PDF document text
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_51310f9f60a9491fae3d29acc3202ada.pdf?index=trueIn PDF document text
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_c17c5e63a0394776a1fc9d77ed824dce.pdf?index=trueIn PDF document text
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_68a53634813948678ca9ca1d7acd6d92.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98a7c318-1a27-4fad-b3c1-c641601a612c/sccm_client_installation_log_location.pdfIn PDF document text
    • https://3caa4030-7dd6-4be4-8a8a-e1981c45b3cd.filesusr.com/ugd/704988_24619069c3094af6882f25a64f82dc6f.pdf?index=trueIn PDF document text
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_1d20313c46e6438b88171d10226489af.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/42b9596f-0ca1-461a-978d-18c367ecf2c7/19942596813.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4cdc5f5-29f2-4c43-ba30-e5aea2f528ca/how_many_covid_cases_in_cabell_county_wv.pdfIn PDF document text
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_177f79c6c6d647b483e006f708a141bd.pdf?index=trueIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_f0baaa743aa34192a793e19e22a1cecc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a684c2a-5bc4-49e2-99f5-2418c66e84c7/3d_animation_software_free_download_open_source.pdfIn PDF document text
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_2c24ae254f4a4726a2b593f89c02c265.pdf?index=trueIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_adf9040919614baa82dcee13e51be7a9.pdf?index=trueIn 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_off0000f723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF723 5332 bytes
SHA-256: 55bd1545e1e9456bd2842c7f605f0c62d21e33dbb6cef2fd70ac62480fcf93ad
font_01_sfnt_off00010936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10936 10584 bytes
SHA-256: eed50380716c3366c68a130fdce9805792ae7e22bfe1b39d7b72d68f90d3ac44
font_02_sfnt_off00012d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34