Malicious PDF — malware analysis report

Static analysis result for SHA-256 14215c8989922d78…

MALICIOUS

PDF

80.9 KB Created: 2021-03-15 06:43:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a21d06ee8812e13888d7b1eacec2dca0 SHA-1: 0528756665afe0cd3d5be893e5f6905a28b4b425 SHA-256: 14215c8989922d7841c1eb44501f9c35112a3b40b835472a8b56efdc9cd88293
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish for credentials. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' further support the conclusion that this document is part of a campaign to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://nipisod.ru/123?utm_term=attestation+particulier+employeur+pole+emploi+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419191/normal_600c729390e07.pdfIn PDF document text
    • https://rulusekiraz.weebly.com/uploads/1/3/5/3/135322703/1991065.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382621/normal_6033b315b989a.pdfIn PDF document text
    • https://duzuvopewawufos.weebly.com/uploads/1/3/4/4/134491429/divoseb.pdfIn PDF document text
    • http://gitamoravazini.22web.org/answers_on_a_postcard_cocktail.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478127/normal_6039dcc04a885.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498992/normal_60371859e1078.pdfIn PDF document text
    • http://toselarasomax.iblogger.org/raraluxajewut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371786/normal_5fdcc623403e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_fa8be04a320342c0baa5b51f72f5d7f1.pdf?index=trueIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_adb6aa3ef95d430f84a45f3d7019b7af.pdf?index=trueIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_521495f267bf49ad9cda829ced430049.pdf?index=trueIn PDF document text
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_193f6d26e55d44d7a553c1285e3f8dd4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/91a2c9a1-8514-457d-876d-12770824bf02/can_i_get_microsoft_flight_simulator_on_xbox_one.pdfIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_979de355f04d4be4852505b33cdb83ff.pdf?index=trueIn PDF document text
    • https://9329dc78-1a6b-4cc7-98ac-1b36262b7dd5.filesusr.com/ugd/d2be55_39089d26f45947e2bba8f58e85a147b4.pdf?index=trueIn PDF document text
    • http://keporeninudo.rf.gd/gettysburg_licensed_battlefield_guide_salary.pdfIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_c0a2487801ae4f0a824edb6a10d2bc39.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1430528-2aeb-4b31-9ed1-3094d6a86bab/shark_euro_pro_sewing_machine_reviews.pdfIn PDF document text
    • http://pusovogubazix.epizy.com/fitevadeli.pdfIn PDF document text
    • http://lajuwojuwel.epizy.com/60584595127.pdfIn PDF document text
    • https://4868a29a-6d77-448d-a9c5-bc5c6a1713c3.filesusr.com/ugd/060e50_71bedbfa39dd4c56b77b8c1b1867c213.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
    • 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_off0000e475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE475 5392 bytes
SHA-256: e9143ca7b3f42943286ab481b97d1d7a8b8da7af803fb020a7f002c60c04a05c
font_01_sfnt_off0000f6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C0 12684 bytes
SHA-256: 01d81024bc9751d1e93005d3312864505412a4004cd2a00bc79363dd4d2325d8
font_02_sfnt_off00011f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F01 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d