Malicious PDF — malware analysis report

Static analysis result for SHA-256 436405a01de7134a…

MALICIOUS

PDF

68.3 KB Created: 2020-11-23 13:24:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 3a63f2aa87abc07d108ef037a6e97d1e SHA-1: d55e59cc862d40c3979089899ff59a7e519b7d89 SHA-256: 436405a01de7134a43aa6c4887e2de19be03d684d94593263e3305490c9da2e1
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, with several pointing to suspicious domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a malicious intent to redirect users. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://trafffe.ru/strik?utm_term=resident+evil+afterlife+full+movie+english PDF link annotation
    • https://dadomirizetuso.weebly.com/uploads/1/3/4/8/134870225/2356e67bb230d1a.pdfIn PDF document text
    • https://manoxumumaxu.weebly.com/uploads/1/3/4/4/134472756/6005614.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408355/normal_5fa80643b750e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472763/normal_5fa576c514ff0.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/xududev-ledavodu-jatulivarolaxe-bixebenal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367290/normal_5f89df65e86c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/moving_words_math_worksheet_pizzazz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb8226d9-199d-46c3-845a-7465e066046f/camp_chief_ouray_ymca_of_the_rockies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6b19eae-85ee-482a-9aad-b2023062a232/a_physics_book_rests_upon_a_level_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ac1858c-ea83-4fde-bf1d-b4bfef905e32/medical_surgical_nursing_book_lippincott.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d1a73e3-bf86-4889-abd7-c632f69dc5a8/fezemegisatirejuxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38bb61fa-b319-4b8c-b95d-888bb319c79f/unable_to_establish_a_wireless_data_connection.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/maxapuwefotajogosoxesok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36e2529a-c5d1-4c7d-ab61-175407e11a6d/jumenikupetelamagedakuv.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_off0000ca75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA75 5388 bytes
SHA-256: 37130b0a57f370e9df5e8a46e6ba3286dec6053ad4ffc263a179046801004b27
font_01_sfnt_off0000dca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA8 11912 bytes
SHA-256: 932f34ad6b6fdcf761f0f74f9cfc59420bcdd5d8359c8f645012548187bc1704

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