Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff6a297abe24c9d…

MALICIOUS

PDF

70.6 KB Created: 2021-02-11 15:49:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ea1d351c696b0141430dd7cb0743ae7d SHA-1: fc89b23fb6274cf0165886c5250752822c94bb71 SHA-256: 4ff6a297abe24c9d7e45a7af7fe94253902fb1bcdcd26d65f112cf7eb5457e76
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URL that directs users to a suspicious domain, disguised as an answer key. While no scripts were explicitly extracted, the PDF structure and the presence of an external URI suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

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://druttle.ru/123?utm_term=box+and+whisker+plot+practice+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418583/normal_5ff711f8120ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380078/normal_5fe27b8ee4aad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366652/normal_600cf7a10937e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486765/normal_5ff4693205166.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/gjhahdh/best_high_school_learning_apps.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391642/normal_5feb25963daf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485173/normal_600a0f884c8c0.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
    • http://somifinufax.rf.gd/facebook_lite_latest_version_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/43479378047.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/gumarolamibugiselusa.pdfIn PDF document text
    • http://pipinodojo.epizy.com/apologia_physics_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/84653369479.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/angular_material_radio_group_reactive_form.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/cognitive_skills_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/best_free_antivirus_software_for_android.pdfIn PDF document text
    • http://sirilamezowi.epizy.com/73932868206.pdfIn PDF document text
    • http://vizawog.epizy.com/bhai_marathi_movie_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/nirunirileroludajikus.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/mele_kalikimaka_violin_sheet_music.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_off0000c92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92A 5324 bytes
SHA-256: 1c32325ede491f481dbe82cc4e87b1587af2d2b127f7f2c565d2fe5911e6b5bb
font_01_sfnt_off0000db4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4F 10292 bytes
SHA-256: 3152428004faffe6e31d4d751ab4936fcafc444cff97067c55db6c9b56f26b48
font_02_sfnt_off0000fe75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE75 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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