Malicious PDF — malware analysis report

Static analysis result for SHA-256 95d876cf43428f55…

MALICIOUS

PDF

82.6 KB Created: 2021-04-03 02:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 882c50a1bee1279b63361abc86360fbd SHA-1: 139fd59d93763f1ea0fcb5705e8a9abf955c9808 SHA-256: 95d876cf43428f5578eb61add28700c5686cb3ddfce3c6e7affc7d3598255e7e
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an external URI pointing to 'jacksth.ru', which is likely part of a phishing campaign or a distribution point for further malicious content. The presence of multiple unknown URLs suggests a broader network of malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/award?keyword=carcinoma+epidermoide+conjuntival+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415309/normal_602ed6285bad3.pdfIn PDF document text
    • http://agentsoft.space/noludozakezujage22n.pdfIn PDF document text
    • http://obmenkalnr.online/babexinujeloxisu9p1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464735/normal_5fe19fd33042d.pdfIn PDF document text
    • http://logvoz.ru/kilazerovarifuritolol8vsnk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420612/normal_5ffff0d7d7f5e.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/85727625868.pdfIn PDF document text
    • http://e-devletturkiyeaidatsistemimgovtr.com/cognitive_bias_codex_with_definitionjhr5y.pdfIn PDF document text
    • http://bawazofo.getenjoyment.net/bach_fugue_in_g_minor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480149/normal_5fd23c85a5483.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/0f5d8f88-0d7f-41db-8d66-c6e8d7705c1e/dewalt_20v_drill_impact_driver_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a0c11c7-5e68-4e90-afa3-14b96cc12e55/85928364812.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab568f67-9053-4020-9cdc-d8d7d32b140f/wings_of_fire_books_1-5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d6c6fc5-08cb-4eb6-b136-06b02ab19ad2/dave_ramsey_monthly_budget_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11394322-eade-4f16-9677-972d15986976/62641172785.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/fojigewubiboguxurajagolom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/175c2573-3680-46de-b30c-3b609179ef7b/asus_p6x58d-e_bios_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/rawupininufuxiver.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/13278364344.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/906d13cb-802a-4f69-8290-5f66abda3769/critical_review_of_a_qualitative_research_paper.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_off0000ec0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0C 5164 bytes
SHA-256: a3522372e4cd7f1ec21022d57de50f0ae00a5a017a031a4d5379bc69d47f3033
font_01_sfnt_off0000fd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD95 10936 bytes
SHA-256: 083290cc7acd1021193d13a211ad5beec937b6507039f5538dfaf898cffb7dbb
font_02_sfnt_off000122c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C4 17524 bytes
SHA-256: 58e406829267f58e4d16620800876d584390a9c32f82c24fb8e44712eb64037c

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