Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb644559d8729c8…

MALICIOUS

PDF

73.8 KB Created: 2021-06-09 15:38:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e120735bfdbb2dbd6ae06c3aff91f7f1 SHA-1: 03e7083aea2a01033747283d3eb66f14fc08d734 SHA-256: 6cb644559d8729c822b368682697f699c30bf3834e8ba4cfec8cc7a3214d2d88
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by heuristics as a link farm and a phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for credential harvesting or further malware delivery. No scripts were extracted, but the PDF structure itself is used to host and present the malicious links.

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://inwebjor.ru/pbw?utm_term=kulebagavali+movie+songs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450440/normal_60380c4b77b23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481166/normal_5fc887490d3c4.pdfIn PDF document text
    • https://mipadabu.weebly.com/uploads/1/3/4/7/134751654/9936545.pdfIn PDF document text
    • https://jimirona.weebly.com/uploads/1/3/4/2/134266163/vusigifefodi_xewepapevozumi_tobamon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474987/normal_60488f1e4b6b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_600a86405fd3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455916/normal_60579df3b080a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457582/normal_603c10c31600f.pdfIn PDF document text
    • https://zogiwabut.weebly.com/uploads/1/3/4/3/134364715/sibemasawut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420910/normal_5ffb92eaa41d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459780/normal_60c020ca1813a.pdfIn PDF document text
    • https://jutonigozazizeg.weebly.com/uploads/1/3/4/7/134700746/af9cf.pdfIn PDF document text
    • https://dugemitisij.weebly.com/uploads/1/3/1/4/131409309/9423859.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pezeliv.pbworks.com/f/preschool_worksheets_christmas.pdfIn PDF document text
    • http://pitevaj.pbworks.com/f/thinner_this_year_25_sacred_exercises.pdfIn PDF document text
    • http://furalagaposu.pbworks.com/w/file/fetch/144552843/salilosidekedexoguvo.pdfIn PDF document text
    • http://xotokuwawa.pbworks.com/w/file/fetch/144775086/what_conditions_result_when_the_pituitary_gland_hypersecretion_growth_hormone.pdfIn PDF document text
    • http://buvulareka.pbworks.com/f/bidapebodop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1c3e3f6-84f6-4c12-8b30-34a4c31e67c4/el_pollo_loco_offers.pdfIn PDF document text
    • http://zuxanuj.pbworks.com/w/file/fetch/144780501/watch_return_to_the_hiding_place_full_movie_free_online.pdfIn PDF document text
    • http://fisukafetif.pbworks.com/f/zombie_shooter_2_apkpure.pdfIn PDF document text
    • http://pinurakus.pbworks.com/w/file/fetch/144540306/2219179685.pdfIn PDF document text
    • http://pevozowo.pbworks.com/f/mortal_kombat_chaotic_3.0_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86dbdc9b-adfb-46e8-9619-5f9d72e03525/gamamun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/695a64ef-852a-4a7c-8589-f196fa6ed7f3/83706778299.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_off0000e428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE428 5076 bytes
SHA-256: 0fc6cca0bb3b63837adf1689ce290a6b9fcc98550e56b1af9d86a7c3e9782a77
font_01_sfnt_off0000f56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56C 10820 bytes
SHA-256: 0bebee0d87bcdd09809b05d83836f8fa8f719a53bb31feb1f9f864a750b04a73