Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5bdf7b61a02d8b0…

MALICIOUS

PDF

76.5 KB Created: 2021-03-20 03:16:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35d8605e2f0b1b1fb9166397278c2fd3 SHA-1: 9e26e26ff5884f83227b92d72fc4ba3bc1dd12a4 SHA-256: a5bdf7b61a02d8b00b467c5d27d7b35416c61dd29fc7a5645efb8432e4f7a0ea
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, suggests a lure related to a 'bank on it worksheet answers' which aligns with phishing tactics. The presence of an external URI heuristic further supports the malicious intent of directing users to a potentially harmful website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/wix?keyword=bank+on+it+worksheet+answers+cinco+de+mayo
    • http://vefipitop.22web.org/pasibuboxexoxuxoru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/minabiwa/bixolon_slp-_dx420_driver.pdf
    • http://wexipara.rf.gd/marley_and_me_2_the_puppy_years.pdf
    • https://s3.amazonaws.com/muxegeza/rezatisuxa.pdf
    • https://s3.amazonaws.com/sewamos/sarufokogir.pdf
    • http://juwiwigepumer.rf.gd/71706087551.pdf
    • https://s3.amazonaws.com/xasovewipeje/linux_shell_script_manual.pdf
    • https://uploads.strikinglycdn.com/files/8f80c8ab-4541-4aa5-b399-9312e33bca5f/damerewepobogebelixotus.pdf
    • https://s3.amazonaws.com/fodose/graphtec_ce6000-60_manual.pdf
    • http://zewadajimenu.rf.gd/69037637868.pdf
    • https://s3.amazonaws.com/julaxel/srimad_bhagavad_gita_in_gujarati.pdf
    • https://uploads.strikinglycdn.com/files/097b3a3b-b774-4e1b-9130-802099fb5989/how_to_put_a_vinyl_sticker_on_a_car_window.pdf
    • https://s3.amazonaws.com/juwofuxufijup/kindergarten_phonics_practice_book.pdf
    • http://mesipupip.rf.gd/boxenuditefisusotelur.pdf
    • https://s3.amazonaws.com/dazinibonofobi/demif.pdf
    • https://s3.amazonaws.com/lopeteb/94868516860.pdf
    • https://s3.amazonaws.com/rodakarugupoko/nervio_facial_ramas.pdf
    • https://s3.amazonaws.com/gopifu/bal_krishna_wallpaper_hd_1080p_free.pdf
    • https://s3.amazonaws.com/busutafitufe/super_mario_bros_wii_u_world_2_castle.pdf
    • https://s3.amazonaws.com/feliso/pepexoripafinivu.pdf
    • https://s3.amazonaws.com/vososasoxumete/android_sqlite_database_update.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_off0000ef4b.bin
5d814d18461767124518100c8776785bb46551ce0ed9f067311eb6a0126213d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 5456 bytes
font_01_sfnt_off000101c9.bin
257ca779c0b3299f2c1ac0b8f62ec9be6f91a38629b2ce24efcbf733f3e7e63a
pdf-font-stream PDF embedded font (sfnt) at offset 0x101C9 10124 bytes