Malicious PDF — malware analysis report

Static analysis result for SHA-256 d363608768bc327d…

MALICIOUS

PDF

83.6 KB Created: 2021-03-21 10:44:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ed8905206f349f74fcbe551dfbb5ebd7 SHA-1: b47a517a799a632602079da85f7306f75abc36ff SHA-256: d363608768bc327d2220ac9a2483a90d9c8ff062a98b126ac0ba5e6125be8954
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 ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to distribute malicious content or phish for credentials. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bologen.ru/award?keyword=split+pdf+mac+command+line PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426418/normal_6006395f22cd4.pdfIn PDF document text
    • https://cdn.sqhk.co/nitumatemi/chjf66o/torco_racing_gear_oil.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/Dhjhghi/62549862935.pdfIn PDF document text
    • https://cdn.sqhk.co/riragimi/pjeianz/71998941027.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468820/normal_6032c915d90ed.pdfIn PDF document text
    • http://damvglaz0.xyz/81682257622mjr9l.pdfIn PDF document text
    • http://bionatur.space/microsoft_office_365_sharepoint_online_trainingqwhwa.pdfIn PDF document text
    • http://mimamiva.iblogger.org/amar_chitra_katha_bengali_free.pdfIn PDF document text
    • http://dehydratedoriginalgoodness.com/vlookup_example_excel_sheet2wqdw.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvupalib/gdgegi8/codigo_penal_guatemalteco_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385634/normal_6021bdca17c92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367304/normal_60341ae5ccd42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477913/normal_5fd84f05d1037.pdfIn PDF document text
    • http://muzoc.xyz/wigafefibopemuud50s.pdfIn PDF document text
    • http://tosanigepa.iblogger.org/bo_v_file_khng_cho_copy.pdfIn PDF document text
    • http://tusudifiro.iblogger.org/eragon_book_first_chapter.pdfIn PDF document text
    • http://wijovoluwuxedo.22web.org/61100110777.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/60ef4d84-1ad4-4bdf-ad96-c9d8196855f6/nopaje.pdfIn PDF document text
    • http://kagiweluxipo.epizy.com/jafinotitatizuramixem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c748420-95e5-4a34-b938-9bd7bc23e010/88466549636.pdfIn PDF document text
    • http://kiduvunizujenav.rf.gd/51461238966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c7dcc8a-1bf6-4162-a400-bd12c4283c2e/how_to_differentiate_viral_and_bacterial_pneumonia.pdfIn PDF document text
    • http://xujalupa.epizy.com/ninunikeratul.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1B 5128 bytes
SHA-256: 4356571312f3c88487fe361ea0bb3ef4bbfce5381f7e888bfa94ce16bce226f4
font_01_sfnt_off00010083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10083 12744 bytes
SHA-256: 181b896593b4a43dee699e565a6d92377adcc57d178127e18171ab1a349fecf5
font_02_sfnt_off00012b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B37 16388 bytes
SHA-256: a4f616c8ed03231f927c8f6725ddfb6aed79ba1e9c0c9257d690ec40f184d4cc