Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee8b43143b27b4ca…

MALICIOUS

PDF

87.1 KB Created: 2021-04-24 10:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: d664af0baf083600209ac00144bcac13 SHA-1: 266f8ec217ae8ee21af276b76ca15ace2bd89238 SHA-256: ee8b43143b27b4cae3c9f2203f135755f922fa69b32b1fb50a0abd90a17f3631
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded links, with at least one pointing to a suspicious URL (https://lozipotod.ru/strik?utm_term=different+curriculum+models+pdf) hosted on disposable infrastructure, characteristic of phishing lures. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the phishing campaign hypothesis.

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://lozipotod.ru/strik?utm_term=different+curriculum+models+pdf PDF link annotation
    • https://cdn.sqhk.co/jeforije/eRibCgi/87083757500.pdfIn PDF document text
    • http://duxezawiw.iblogger.org/lofukarileloxusunam.pdfIn PDF document text
    • https://cdn.sqhk.co/gokarunedod/g4uEEx0/project_manager_soft_skills_resume.pdfIn PDF document text
    • https://cdn.sqhk.co/nojebimit/heHidhe/simple_employment_contract_sample.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_0b79481c0ca942b292b87ec55a071055.pdf?index=trueIn PDF document text
    • http://zopuraxikesu.epizy.com/76825837701.pdfIn PDF document text
    • http://duranovimatatal.rf.gd/pazagafunisivajugimufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8171887a-d52c-452e-af1e-9a8b9430e32b/ge_sunsmart_digital_timer_15312_manual.pdfIn PDF document text
    • https://e321b6f2-2a0a-4c58-8c60-26baf46d82f1.filesusr.com/ugd/14900c_038f9485530541fcac335d6869b4001d.pdf?index=trueIn PDF document text
    • http://mebijatow.rf.gd/69490064247.pdfIn PDF document text
    • https://d12e84a0-9808-45da-82c6-613dfe540d1b.filesusr.com/ugd/dc8a8e_008ab34c86134aa39dc2da882e7fc705.pdf?index=trueIn PDF document text
    • https://79d8ee67-2172-45f8-9737-086b37aa5bdf.filesusr.com/ugd/2ab2ae_dea3fc908a66480ca3dacab29a471de7.pdf?index=trueIn PDF document text
    • http://mebukaronov.epizy.com/sojevizorewezumulado.pdfIn PDF document text
    • http://mebexadesojixip.rf.gd/33333260553.pdfIn PDF document text
    • http://ruvotavigep.rf.gd/fikeripipidumotajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec978c62-fe05-4aab-be01-4b5836e74f9a/92434174299.pdfIn PDF document text
    • https://9049409e-dcbb-43fe-b7cb-0f7a5d042cf1.filesusr.com/ugd/e59eee_b4643e2ac5464c2eb3894b2437cf8130.pdf?index=trueIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_2b4c56cfc3af48c58d3855032c8f1b7a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4a49d2b-9472-4028-9b76-8b7b0f3f28e9/82409727481.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B00 4972 bytes
SHA-256: bb21b43f92e749e7f11cd2dcbf293a713a457b363c38ea85ff06c903cd3b0355
font_01_sfnt_off00011bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCF 10888 bytes
SHA-256: ff4a20f205983ef7b231c52d2ff5d6d4146cbcfad8d07a9842946fa912868f94
font_02_sfnt_off000140d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D8 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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