Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d2143039f7f9f5…

MALICIOUS

PDF

82.2 KB Created: 2020-12-15 00:10:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a9e6439a0446477833fa279f2b141e63 SHA-1: 232e481fdc68edf464649d2341a0ffdee1e8ad99 SHA-256: 39d2143039f7f9f5c6980a0613feb74764456884647178aa33c7841d5a76db7a
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL that appears to be the primary lure. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to redirect users to a potentially harmful website for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/strik?utm_term=high+school+art+history+syllabus PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4447669/normal_5fce6b7281873.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382780/normal_5f9b1cfd43ef2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393908/normal_5f93591891f89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366662/normal_5f8dbb723daf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380882/normal_5f96d1c6783c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469623/normal_5fc40cda500be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454301/normal_5fc6abf50eff6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380078/normal_5f925b4344bd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412154/normal_5fa7101f68a0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386361/normal_5f923957a1b05.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/045c5086-0406-4545-9d6b-a384fe37d23b/xututiwetepifuvogavepise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b8a850c-a5ff-43e8-bf15-49eca9e76306/fagumoripebodijedumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef50cf62-e850-47bf-9b81-d7728e05e3d4/52270545466.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a8d4198-1476-45c0-aa60-084e9eac7be9/physical_science_unit_2_study_guide_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aed8490b-3c98-459a-9c03-a9d522f67ae1/zabulebogetaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00f505d8-90c1-4134-a5bd-bcd8c225e261/bimodivaze.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF35 5264 bytes
SHA-256: 7ab5bc16bbdf56c95a336ebb5483562aaffa46709902626fe5e9508567b6eb12
font_01_sfnt_off00010126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10126 11124 bytes
SHA-256: e0dcb8b14bdf5934edb9ce2d263a4d709d2ce8de60d57f0d359b4bafb14a5219
font_02_sfnt_off0001267b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267B 16064 bytes
SHA-256: 62057359ad22ed6c79ab6a94c34af50e7f9192dd49eed379a27769cab1f8071c

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