Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d1b9759c4c3708…

MALICIOUS

PDF

68.5 KB Created: 2020-11-18 09:52:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1b00545b5ab567b79d67b23dc1650e8b SHA-1: 1772ff01e1a8c2d82cd6c8bc82dbb735d5d988cb SHA-256: 55d1b9759c4c3708dd0a37560aec31b2b27d363eeb8d655cc370ba5be13e4ea2
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that, when clicked, likely leads to the download of a second-stage payload. The document body, though heavily obfuscated, suggests a lure related to downloading a book, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/strik?utm_term=libro+de+aritmetica+de+baldor+descargar PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368781/normal_5f9890ccc7903.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370767/normal_5f8efd6eee1cb.pdfIn PDF document text
    • https://jewumuseporefi.weebly.com/uploads/1/3/4/5/134599703/6c2590707df9afd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366407/normal_5f8754fa8af3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377933/normal_5f8f1baa8bc6c.pdfIn PDF document text
    • https://fulafokowezoje.weebly.com/uploads/1/3/4/3/134384829/9166966.pdfIn PDF document text
    • https://repugonajipivup.weebly.com/uploads/1/3/0/8/130814926/2f1b23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458635/normal_5fa15f3a38b08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389365/normal_5fb351dc25e56.pdfIn PDF document text
    • https://fatagodudun.weebly.com/uploads/1/3/4/3/134327877/25b9b0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421937/normal_5fa1653d2167e.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://uploads.strikinglycdn.com/files/539404a8-4268-4af4-b22a-86b0aac57ef1/amsco_world_history_ap_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/904c6223-15af-4900-9331-fb912391713f/82600460490.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_off0000c278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC278 5024 bytes
SHA-256: 61dc4a0f4889946d822d9f9b9eff65bbbc9acf979c33b7488bd35dbd4e036ada
font_01_sfnt_off0000d384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD384 10916 bytes
SHA-256: 574b994ae18043c476fa05795d8b1045023d809e02213b3f2b52e583cade57a5
font_02_sfnt_off0000f6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F1 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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