Malicious PDF — malware analysis report

Static analysis result for SHA-256 f93fe0d7c4979771…

MALICIOUS

PDF

77.5 KB Created: 2021-05-28 14:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c07a0f168455435d81e8f72464f50058 SHA-1: e1cb5c993e7249e4d2a3178dc68a876be90bfc2c SHA-256: f93fe0d7c4979771e5cd4d97d07540de73165ddb9af13f5361fbed567105bcad
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'bologen.ru', which is likely part of a phishing or malware distribution scheme. The document body, though partially corrupted, suggests a lure related to educational content, specifically 'simple past tense with examples'. No scripts were extracted, but the presence of an external URI and the overall malicious verdict strongly suggest an attempt to redirect the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/strik?utm_term=what+is+simple+past+tense+with+examples PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481058/normal_5fed4b1973cd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418786/normal_603b3ff1e07fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471256/normal_602642246457d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426066/normal_5feafdec7feb9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421039/normal_5ff3391ebb01f.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/13fc88a3-0917-4a28-8d7f-c1ee6b3878d7/92792754544.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/816bcc0f-cba0-4497-ae77-31f38d88df97/dukururikofivekinejima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf333bcf-b0d5-4408-ba8b-60f610696bf1/impossible_quiz_book_chapter_1_question_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a063d4bf-6add-42bd-9dab-cbaaf8994c6e/26361972118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05735c67-16d0-442d-845c-daaf1510a716/68597356812.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/285350a9-fae4-4883-bc57-6cbd9c05fb39/calculo_diferencial_e_integral_serie_schaum_1175_ejercicios_resueltos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccc5b0a4-0967-4a32-be46-5b5902aae158/imagenes_de_rostros_con_diferentes_emociones_para_colorear.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ee7884a-9534-428e-8e01-9dc7da89a3ad/how_to_watch_crisis_on_infinite_earths_in_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/749cca9f-de5b-42a1-b1ab-61e22c9021fb/bulova_precisionist_mens_black_strap_watch-98b318.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aa135f2-be15-4edf-900e-0c65e44f9419/ghost_boy_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e278902-a880-4b79-95d3-db13ae39b57b/1787715342.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5bb225f-8d15-4d48-9f0c-9d80649939a0/81921839206.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a015f87-2928-43d8-8819-58bdda55dbaa/63427410814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c8bad41-f24f-4a43-bdb3-28b26f4f20f5/sap_erp_software_free_download_full_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d217a2af-18d8-4656-8c4a-ff6015224a9b/ado.net_database_connection_in_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fa91f6d-ec80-43ba-b51e-a9e35373ecc3/symbol_scanner_programming_sheet_ds6708.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5ebdce9-96f3-4f5f-9c3e-f202bd32b9b4/53107615852.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C5 5136 bytes
SHA-256: 6b8c5ec261dfd332de1441e1e8608ce6bd682b28d69d63ce7fa68258bfcf0560
font_01_sfnt_off00010435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10435 10832 bytes
SHA-256: b0f52d2c6b537d4b50bac886cace4d1084ce7e20b1f0355ec347788836a9d62a