Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b50923c25cfa56d…

MALICIOUS

PDF

63.8 KB Created: 2020-11-21 02:46:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: c178a1d280cf87163494e16d3b197140 SHA-1: 17116bd7ed57d6664cb9d1721a1c78a664405adb SHA-256: 7b50923c25cfa56d37592c3a46f4021473d2fa20307171e3eb3768b48a72afd1
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to educational content, aiming to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/123?utm_term=holt+mcdougal+geometry+chapter+7+similarity+chapter+test+form+b+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420617/normal_5faf0d18e23ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472188/normal_5fb2a8e07acc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5f870ca31d236.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502920/normal_5fb52305ccaac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377401/normal_5fab6bad2a2ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420939/normal_5f992bb8d459c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413712/normal_5fb2d92e641b6.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/b9eb2f68-0c8b-4575-97c9-84b798fe8692/12934388455.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5243e42-bf0d-4435-97fb-c7bff8b8108a/kenzies_rules_for_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98ede974-4a87-4ab0-baff-23a5037cd355/frindle_vocabulary_activities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d4232d2-9326-4914-9a03-18f2922d1fcb/60180257007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/773e2d10-cbcc-432f-99d4-ebbd23ed899c/getevulawodifa.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_off0000ad2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD2B 5828 bytes
SHA-256: 99894c57bf045f9850cd395e23836b921f604c3486e8b3d887cafd3c0fa3d7d4
font_01_sfnt_off0000c0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0EB 10272 bytes
SHA-256: 83cbff4989033b17983a1262b512634a0a0c1b0311db9259c86203afc5e3d82c
font_02_sfnt_off0000e3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DE 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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