Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb94d97e798344d0…

MALICIOUS

PDF

76.2 KB Created: 2021-03-16 16:48:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f10d7a81d7d9dffcacbff56f1c27ec33 SHA-1: 1a3d5c57fff08ef6be00b2f396849d2feeb8797e SHA-256: cb94d97e798344d01ded4ee38e73f47bf2bb97bd712dd84c70f964cb6451ac23
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'kuzutuzo.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to 'Thermo king engine specs', suggesting a lure to disguise the malicious nature of the file. No scripts were extracted, but the presence of external URLs and the overall detection profile strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/strik?utm_term=thermo+king+engine+specs
    • https://cdn.sqhk.co/dewozoju/3Q1Jpjj/49673795586.pdf
    • http://mignonette.space/20229865294yk9zh.pdf
    • http://leafester.online/what_are_the_rules_for_a_learners_permit_in_floridaiopkv.pdf
    • https://cdn.sqhk.co/fapetemiji/hhhGfOm/69754188017.pdf
    • https://cdn.sqhk.co/gasariba/9geKUje/nuwowosa.pdf
    • https://cdn.sqhk.co/dusaradezat/Tljd2DV/xolarudole.pdf
    • http://fitness1.space/ruvotunejekaxawevewitsu2a9.pdf
    • https://cdn.sqhk.co/vitozogog/kicghhj/dejasatugokasarenaz.pdf
    • http://beach-fruit.fun/15996448125ej0zw.pdf
    • http://sportplays.ru/why_i_am_not_a_christian_audiobook0vd8y.pdf
    • http://gratoramm.website/bazudazunasulupabukanonsp78a.pdf
    • http://creditscorehelp.info/52142847492g7bp5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/15469b60-b39e-40a9-8791-45cf70640ee6/how_to_recycle_canon_ink_cartridges.pdf
    • https://uploads.strikinglycdn.com/files/b5e60986-89b3-4d1a-88de-72339dd184d2/how_to_get_a_hawaii_tax_id_number.pdf
    • https://s3.amazonaws.com/juzowilipi/goong_ost_violin_sheet_music.pdf
    • https://uploads.strikinglycdn.com/files/3cec78f8-68de-4048-b756-3427dbaa0910/triangle_congruence_worksheet_2_answer_key.pdf
    • https://s3.amazonaws.com/dapekufoxiraku/retolitegedon.pdf
    • https://uploads.strikinglycdn.com/files/67514640-ed2c-4fa5-b8ad-e5470c19ed94/notas_de_piano_canciones_romanticas.pdf
    • https://s3.amazonaws.com/juduk/devukewano.pdf
    • https://s3.amazonaws.com/sukedil/31424206052.pdf
    • https://s3.amazonaws.com/fupanabivote/volivolumoriges.pdf
    • https://uploads.strikinglycdn.com/files/56e21cf9-ad0f-48c5-b22b-e7b387ee8dc6/odyssey_book_8-9_summary.pdf
    • https://s3.amazonaws.com/fejififimaketo/captive_prince_fanfiction_laurent.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_off0000edea.bin
4c7e74460d2f98cb544ae93e6309801626136dc49215ea91a0171b472867352d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEA 5120 bytes
font_01_sfnt_off0000ff36.bin
afad93ab0ee12014542fecc180fdd5b082ea29fba808bfed9433a25a404d14d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 10788 bytes

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