Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef77825ecbe24b6…

MALICIOUS

PDF

64.0 KB Created: 2020-11-30 11:52:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0829d1fb0c5cb2171ce8022dd95435ca SHA-1: 9297163169aca835be50a2ab0b672c0aa1fb17c3 SHA-256: 3ef77825ecbe24b6be25adf4cc88e2a58d9a0bdd8853ef5679521f6b81390720
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, appears to be related to educational material, suggesting a social engineering lure.

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://trafffe.ru/aws?utm_term=aritmatika+sosial+kelas+7+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385021/normal_5f9f39021560f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426551/normal_5fa71e8082b67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415754/normal_5fa235e1ce74f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372076/normal_5fa2bd07bfda8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481052/normal_5fa88ebce8a62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487663/normal_5fb261487636d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455197/normal_5fa050c93265b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc101f96609fd0ee791e489/t/5fc2350a4e98326c0259fab1/1606563082418/voltage_divider_worksheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0eda3ec917750a3d80aaa/t/5fc173b43c6ccf69f394e94e/1606513588814/zojirushi_bread_machine_bbcc_s15_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6049a961-4843-4a9b-95cf-99e91b9215d5/4731429366.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0cf44e5c7695ca99b2c1d/t/5fc19c126457125654791f36/1606523923624/22891341127.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_off0000bd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD54 5320 bytes
SHA-256: 9bcf9381d55452ea377ab70150386c941bef2b583af8f3a8b9876817f0ffd020
font_01_sfnt_off0000cf61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF61 10524 bytes
SHA-256: 1af5d54087acbd36c6d90fb18a59b6c6113d717a1abbd96d7e39ed0dc17ea59f