Malicious PDF — malware analysis report

Static analysis result for SHA-256 59ddd2ea52145b7c…

MALICIOUS

PDF

82.9 KB Created: 2021-04-03 19:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e6b245cae50c2ec59491f0d9dfcc1987 SHA-1: 6c472f5b6cbef0f6c4097b0d4cf1e00b14f1d4ac SHA-256: 59ddd2ea52145b7c0c94f06bc8a16a4d6267ce3ab805567bf4e19dc5a83aa417
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded URLs, particularly the one pointing to 'zajinet.ru', suggest a phishing or redirection scheme designed to lead the user to a harmful site. The document's content, though heavily obfuscated, appears to be a lure related to medical information to encourage clicks on these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/award?keyword=iron+deficiency+anemia+causes+pdf PDF link annotation
    • https://cdn.sqhk.co/dasewugiru/igjNqij/blank_name_for_kik.pdfIn PDF document text
    • http://newuwedeza.mypressonline.com/bmw_3_series_gt_service_schedule_uk.pdfIn PDF document text
    • http://xonukab.22web.org/heat_treatment_guide_handbook.pdfIn PDF document text
    • http://migerov.xyz/zikob1grdr.pdfIn PDF document text
    • https://cdn.sqhk.co/govizanorev/hRgjria/fajeropadesilavozewolonel.pdfIn PDF document text
    • https://cdn.sqhk.co/xigofidiw/Xtchbhb/58777798282.pdfIn PDF document text
    • http://cmbclientes.com/gothic_2_returning_2.0_downloadxlgs1.pdfIn PDF document text
    • https://cdn.sqhk.co/xolovagi/fhaeUsY/aimpoint_pro_battery_cap_strap.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/2b98b1e9-4671-41f9-923b-323a53311471/11712528293.pdfIn PDF document text
    • https://6e345194-e688-4037-aa24-2ff230a16836.filesusr.com/ugd/ce9fe1_979d63ca1e56470cbdfa8ddda6dc9e87.pdf?index=trueIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_c79df819430e49d792a84831f8eae4b1.pdf?index=trueIn PDF document text
    • http://zimofizamar.epizy.com/personal_statement_samples_for_masters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a263762-2faa-4035-ab49-ba67d043cccc/kakeworiwexulupejagagizo.pdfIn PDF document text
    • http://vamavaremimot.atwebpages.com/two_way_anova_without_replication_example.pdfIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_c6f2d07fc6c6465dad3023ace78ee080.pdf?index=trueIn PDF document text
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_6e109e1ba6f24cc98ad19035c02161f1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/43ca9017-e567-4ef5-bcc8-69b02d274539/best_investment_apps_for_2021.pdfIn PDF document text
    • http://ropupifalapoges.atwebpages.com/15037219712.pdfIn PDF document text
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_c5cff25736a9430c86b956be11312946.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001094b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094B 5308 bytes
SHA-256: 3a40232c2e7cfe30e6c74d13e5c70eee93c36ba702d5e42e0fa6f2ad03992cfe
font_01_sfnt_off00011b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B50 10372 bytes
SHA-256: da937cbad9b0afb6be5c0d55ec0dbf522aec1fa5dc7dfa544c907b87a9ccde3b

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