Malicious PDF — malware analysis report

Static analysis result for SHA-256 4842032c9b16c93f…

MALICIOUS

PDF

77.5 KB Created: 2021-03-14 07:06:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8628978a57b32e910215997855fc3fb3 SHA-1: 220c4c44bdea1b5fd83c632dab161e6af522670d SHA-256: 4842032c9b16c93ffa32a5aa74b1b3069bd2be7f7a45c1c85b25e95de1067320
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to 'kuzutuzo.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to an essay title, indicating a social engineering attempt. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/wix?keyword=essay+on+we+wear+the+mask
    • http://siwivelijutore.medianewsonline.com/rajakivojevemizejixudimap.pdf
    • https://votuwokikinoso.weebly.com/uploads/1/3/4/4/134466575/fonidumuziwaz.pdf
    • https://mukeremu.weebly.com/uploads/1/3/4/3/134316251/920a3a75bd2f92.pdf
    • http://stopnutristrike.ru/tekezapuramezozizo5rj2q.pdf
    • https://giduzuzetedeze.weebly.com/uploads/1/3/4/8/134853145/kenobidosafaxa.pdf
    • https://static.s123-cdn-static.com/uploads/4445544/normal_5ff30e6404ce3.pdf
    • https://cdn-cms.f-static.net/uploads/4474759/normal_5fe9e012201fa.pdf
    • http://palitra-cveta.ru/ygs_kimya_indireusmx.pdf
    • https://cdn-cms.f-static.net/uploads/4470408/normal_6035bc5d31e71.pdf
    • https://cdn-cms.f-static.net/uploads/4378831/normal_6036577d375b1.pdf
    • https://cdn-cms.f-static.net/uploads/4374979/normal_5fd3c278be6d0.pdf
    • https://seririgikum.weebly.com/uploads/1/3/0/7/130739922/5031782.pdf
    • https://bozixezexa.weebly.com/uploads/1/3/4/8/134861503/bakofufepiwunuk-luzesof-wubonigupevakep-tevagaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2598569a-54a7-496c-985a-7451928e3b73/vurefumasukojuvoti.pdf
    • https://s3.amazonaws.com/pilazi/tajexo.pdf
    • https://uploads.strikinglycdn.com/files/7c747feb-b967-431d-a185-8927add1e622/eyelash_extension_training_course_price.pdf
    • https://uploads.strikinglycdn.com/files/537993f8-8ed8-4833-ab5e-da2fa570de90/remote_code_for_sharp_tv_comcast.pdf
    • http://sukokovevaz.atwebpages.com/88557216758.pdf
    • https://uploads.strikinglycdn.com/files/cb0e5881-8b54-4a62-9f56-91c7badd9b6f/how_to_open_an_hp_probook_4520s.pdf
    • http://nufulavidibime.myartsonline.com/waxekijusoravarubukot.pdf
    • https://s3.amazonaws.com/mogipegi/vivajo.pdf
    • https://s3.amazonaws.com/dowesitobuga/music_sheet_app_windows.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f2.bin
bf10523cc986c1f4b5af94c11f425ab848c2a59eaa42ccbfbd25a1014fae50aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F2 5108 bytes
font_01_sfnt_off00010440.bin
a47ea577b7feabd7e0fb17a6c135b8b4c55dede0892d29996a2db12bbfd3503e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10440 10284 bytes

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