Malicious PDF — malware analysis report

Static analysis result for SHA-256 a023ca4c27283690…

MALICIOUS

PDF

130.2 KB Created: 2021-03-20 22:14:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea870bf197814426109cce06d5a40e70 SHA-1: b214c7ea7596671a37242940ce71046656f59285 SHA-256: a023ca4c272836905edc2082cf56de76adf9d6b3ebd38387a2c84facdf219bc9
104 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating the presence of external URIs and urgency lures. The document body, though heavily obfuscated, contains references to 'Tetris app free for android' and application metadata, suggesting a deceptive lure. The embedded URLs likely lead to the download of a secondary malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://xezojetit.ru/123?utm_term=tetris+app+free++for+android
    • https://cdn.sqhk.co/tewisifupib/HBhhzid/folejemiginiludelimuf.pdf
    • https://domisupufiz.weebly.com/uploads/1/3/5/3/135316273/973dbcd57a.pdf
    • http://damvglaz2.xyz/canon_pixma_922_printer_manualuu49a.pdf
    • https://tilawebaxipas.weebly.com/uploads/1/3/4/5/134576196/f38455f.pdf
    • http://santecmb-sarl.com/strong_spas_durasport_reviewsqz0sr.pdf
    • http://antonioita.fun/when_should_a_black_baby_boy_get_his_first_haircut3omte.pdf
    • http://winoraama.space/746191016120mor5.pdf
    • https://cdn.sqhk.co/nigudovowa/dhUHAgg/divazakikaferura.pdf
    • http://zofirax.iblogger.org/how_to_learn_a_piano_concerto.pdf
    • https://vawilateg.weebly.com/uploads/1/3/4/6/134697686/3851805.pdf
    • http://lnstgramhelpcopyright.com/macbeth_act_2_quiz_answer_keyo2rro.pdf
    • http://msertis.xyz/bmw_m2_auto_vs_manualsjeky.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xurosinuxev.rf.gd/the_bluest_eye_book_online.pdf
    • https://uploads.strikinglycdn.com/files/8038fe2f-e269-4a5d-9a3b-81cf41ef0815/mefovunov.pdf
    • https://uploads.strikinglycdn.com/files/7b1b53f4-d078-48d6-861b-9e8b30a798ab/starbucks_barista_espresso_machine_manual.pdf
    • http://bibuligo.epizy.com/cardboard_sheets_bunnings.pdf
    • https://uploads.strikinglycdn.com/files/74bbc6d2-474c-4297-9746-266c7e71fd4e/james_and_the_giant_peach_rhino.pdf
    • https://uploads.strikinglycdn.com/files/4dde7afa-dcfb-46e0-b574-5a1e480b7aff/58033214625.pdf
    • https://uploads.strikinglycdn.com/files/4be50f4a-f6ae-48e0-a08b-3987f44721b8/dirijuzuponevagad.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_off0001c424.bin
88031a039cfe97a97d4956f39096821146aafa1f156f1e21206a450aeba456f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C424 4952 bytes
font_01_sfnt_off0001d50a.bin
0399cae6dfd8f672789fd1faeabead95ff045d299e327a0fcc087737678c8f41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D50A 11340 bytes

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