Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f261f32523f4a0…

MALICIOUS

PDF

99.2 KB Created: 2021-06-06 12:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c47691860a5aee8c76dba016872d688 SHA-1: 522b67f502a57a99d591b606709f73300a4adacf SHA-256: 84f261f32523f4a0764ef7c18026e01802d9163d20b7e10cb50cc82aef075285
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 a URL that appears to be a lure for a math worksheet, likely intended to trick users into clicking it. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, suggesting it was generated programmatically to appear as a document.

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://garglob.ru/pbw?utm_term=what+do+you+get+when+you+cross+a+kangaroo+with+a+snake+math+worksheet+answers
    • https://cdn-cms.f-static.net/uploads/4502920/normal_606c4900bee0c.pdf
    • https://gowumobajakexe.weebly.com/uploads/1/3/4/5/134585768/3020152.pdf
    • https://cdn-cms.f-static.net/uploads/4476751/normal_6013a83b6ef89.pdf
    • https://pagugedupe.weebly.com/uploads/1/3/4/2/134266786/nutilatibaxeko_witemix_babikujen_lijekixited.pdf
    • https://static.s123-cdn-static.com/uploads/4446497/normal_5fe50bab0e9d9.pdf
    • https://rogenogenitel.weebly.com/uploads/1/3/4/3/134316557/roxupom-mezebafenixikup.pdf
    • https://cdn-cms.f-static.net/uploads/4384145/normal_602c044ac1c89.pdf
    • https://cdn-cms.f-static.net/uploads/4407306/normal_60557002e07ef.pdf
    • https://domilejoxu.weebly.com/uploads/1/3/4/5/134529458/7937148.pdf
    • https://dekoreriso.weebly.com/uploads/1/3/7/5/137501726/xupesun.pdf
    • https://venolebibu.weebly.com/uploads/1/3/5/3/135348563/faf19177cb389c7.pdf
    • https://static.s123-cdn-static.com/uploads/4424662/normal_5fe4c2614beda.pdf
    • https://nosikofu.weebly.com/uploads/1/3/4/7/134724553/wufofaviporiziros.pdf
    • https://cdn-cms.f-static.net/uploads/4381108/normal_60133de070957.pdf
    • https://duresanu.weebly.com/uploads/1/3/5/3/135334900/datasobazesu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tefimemovem.pbworks.com/f/homelite_super_xl_automatic_chainsaw_manual.pdf
    • http://lagawiwefe.pbworks.com/w/file/fetch/144611364/81100218073.pdf
    • http://gosirata.pbworks.com/f/best_pokemon_rom_hacks_2020_completed.pdf
    • http://ropotupi.pbworks.com/f/holiday_announcement_mail_format.pdf
    • http://sozakuvepar.pbworks.com/f/multiplying_monomials_binomials_and_trinomials_worksheet.pdf
    • http://watusuxipidu.pbworks.com/w/file/fetch/144560262/39914155841.pdf
    • http://poforezufovu.pbworks.com/f/does_razer_core_x_work_with_any_laptop.pdf
    • http://pejuzor.pbworks.com/w/file/fetch/144605181/muzixobakifumom.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_off00014379.bin
b7f5e9e71fd1ec786a61ec116fb1c8523053b482bbfcaf1fe8361d9ae98cfe4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14379 5592 bytes
font_01_sfnt_off00015678.bin
c1b6b27a0f371c38464868d80805a87c3fee50c95672ae24d95ed33c5f5f24b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15678 11264 bytes

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