Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d43881ebeb93e7…

MALICIOUS

PDF

182.0 KB Created: 2021-03-17 22:59:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 534e1ad376ab68a6473b4d45e76180ca SHA-1: 783565a2560ccef8fc5c4036bbdcf700a7232c5a SHA-256: 40d43881ebeb93e70b8a17a75ce5121b613ce1d36d93356e27605905aaa1913a
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 domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm designed to host many links on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botokaw.ru/award?keyword=xenobiotic+metabolism+pdf PDF link annotation
    • http://supariwepexafat.mywebcommunity.org/dunkin_donuts_protein_bowl_nutrition_facts.pdfIn PDF document text
    • http://zotusomadelisok.22web.org/sadovoxatetipeven.pdfIn PDF document text
    • https://dowozazufexu.weebly.com/uploads/1/3/4/6/134606261/vozajilegaseri.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417318/normal_5ff31d1a3782d.pdfIn PDF document text
    • https://wuzetawitowozuz.weebly.com/uploads/1/3/1/3/131381497/sijazoxogubarame.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476127/normal_5fd04d3f675ea.pdfIn PDF document text
    • http://xtina.online/392636389052btwk.pdfIn PDF document text
    • http://edalovert.xyz/application_to_rent_screening_feeo65vi.pdfIn PDF document text
    • https://vavawuzozut.weebly.com/uploads/1/3/1/1/131163550/xabelubomawimipus.pdfIn PDF document text
    • http://app-3null.com/how_to_use_a_sandisk_clip_sport_mp3_playeraz8m2.pdfIn PDF document text
    • https://jaxedafotonomut.weebly.com/uploads/1/3/4/8/134885779/34cfd3f8e051.pdfIn PDF document text
    • http://com-servers.online/analisis_del_libro_el_arte_de_la_guerra_de_sun_tzuivi5v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407301/normal_5fcbf4b0d5bfc.pdfIn PDF document text
    • http://cardioactiveitalia.site/1220103426613151.pdfIn PDF document text
    • http://xapowuxif.mywebcommunity.org/anglican_liturgical_calendar_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kebodilumikida.rf.gd/jamojab.pdfIn PDF document text
    • http://bigofufujenu.epizy.com/surface_area_of_a_frustum_worksheet_tes.pdfIn PDF document text
    • http://mizebowofaz.epizy.com/9364271542.pdfIn PDF document text
    • http://lurorozowuwa.rf.gd/7694151463.pdfIn PDF document text
    • http://rifezitivobe.epizy.com/metal_bending_machine_project_report.pdfIn PDF document text
    • http://lexepetilak.rf.gd/43859534328.pdfIn PDF document text
    • http://tesoxukezeziles.epizy.com/suvep.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_off00027856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27856 5320 bytes
SHA-256: ea20c43548a6d84c632dc7806c562df4c0082b3e5c76f2f881432079be8ee9e9
font_01_sfnt_off00028a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28A57 12440 bytes
SHA-256: a3933bf618fefc100767fe030c4a00208b92f3a3f3275bc67f547824626f2b13
font_02_sfnt_off0002b4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B4A3 16148 bytes
SHA-256: 1a2b76eb92621148de57a48589384f2ed1ce1add53d2a8f9a0414c0ea737f4f8

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