Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb675aa2182ed350…

MALICIOUS

PDF

79.7 KB Created: 2021-03-15 16:07:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4145a9347b5038c4ef6310901d1bfcb2 SHA-1: f18b6259f146538fa8048b7114530387cd344d7e SHA-256: cb675aa2182ed3500e085b7c4e88a9b39926b19089a96d9102e6615e00913cf2
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URI pointing to 'https://kuzutuzo.ru/award?keyword=sociology+optional+syllabus+pdf', which is likely the primary lure. The document body, though heavily obfuscated, suggests a pretext related to academic material to encourage user interaction with the malicious link.

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/award?keyword=sociology+optional+syllabus+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486051/normal_5fe32f0f42a02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_6036c9c7196c9.pdfIn PDF document text
    • http://wigigokewadusad.iblogger.org/wizz_air_apk.pdfIn PDF document text
    • http://volamejabevakik.22web.org/audi_a5_cabriolet_user_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423780/normal_5ff10c4244aa0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369163/normal_6008dcd5607d4.pdfIn PDF document text
    • http://vubunojetufofi.iblogger.org/70613702451.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mixanaz/animal_planet_tv_program_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/free_chess_app_for_android_and_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/742f7a0e-cd25-4ffc-ac3e-22cc6e7829b9/juzibibod.pdfIn PDF document text
    • http://tawexega.epizy.com/conservation_of_energy_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/apc_back-ups_xs_1300_lcd.pdfIn PDF document text
    • http://gotozowixefe.epizy.com/53272107201.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/88515573390.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b974b090-3fc5-4fa1-9cd7-fb02e01e77e9/medieval_2_total_war_kingdoms_mods_stainless_steel.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/67754532130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ddaadb5-5e58-4493-95e4-cbc79eff13b4/2942879738.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9432ca63-7811-4800-b429-a5695f0a9be4/nozatusutoxirivagud.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/13165189591.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f51c401b-a5dc-4471-bea7-18807d15d4ce/mugizapetotuwunogobovopor.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/kathaigalai_pesum_vizhi_audio_song.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_off0000f8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DD 5572 bytes
SHA-256: cd100f8a177f0d0afd54937bc723e1c8b856fd3681430a3fcc0aeb8a5ddd731c
font_01_sfnt_off00010bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEA 10924 bytes
SHA-256: 83a32b058322129eaa17c6927b428d166212632e402761c03e1b81a113849504

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