Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ded9844a90da0c9…

MALICIOUS

PDF

89.5 KB Created: 2021-03-10 06:52:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 98864723e6a0f2d29134d5b449678e43 SHA-1: e9083beb2e6e1f384986fcf75045de9e5070b65d SHA-256: 3ded9844a90da0c9203659e8214f9de9ee5ca3044709d120709b2f642dd120e8
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to 'golowaki.ru', which is likely a phishing or malware distribution domain. The document body, though heavily obfuscated, suggests a lure related to 'worksheets'. No scripts were extracted, but the PDF structure and embedded URI are strong indicators of malicious intent.

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://golowaki.ru/award?keyword=end+punctuation+worksheets+pdf PDF link annotation
    • http://zdorovie-vashe-vse.xyz/misefizekaneten3il0e.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/qwghjiP/best_4k_gaming_wallpapers_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/lagusive/7hhEhag/new_bollywood_album_song_2020_download.pdfIn PDF document text
    • https://cdn.sqhk.co/goganededem/icTigia/42143669973.pdfIn PDF document text
    • http://deutschebank-meine.com/525852672922f9ti.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvupalib/U3XU2cv/dopipa.pdfIn PDF document text
    • https://cdn.sqhk.co/jupozaregu/hhZzidX/marine_corps_galaxy.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/141e7bd9-c6a7-4ec7-8e22-6cdb50f132c9/77623599610.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/basic_lab_techniques_chemistry_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/resize_mac_a3_to_a4.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/collapse_toolbar_android_github.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/94319709571.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/programa_de_auditoria_administrativa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3b7b343-95f4-4412-a478-b37bfe600a87/midakelodawinojov.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/dictionnaire_infernal_1863_english.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/free_dyslexia_worksheets_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/genesis_bible_quiz_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/21534213094.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/how_many_worksheets_does_a_workbook_contain.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/febab.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_off000113b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B6 5324 bytes
SHA-256: 4d0a2b2acd568f4dbe8a81ab61d77ea7c97048c9d73e6e398bfe87e8c3b99af6
font_01_sfnt_off000125e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E0 16584 bytes
SHA-256: 8dc75ea7782154b1207577ac30d608fd28205bc8e5ff7944d0315125dd03c689

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