Malicious PDF — malware analysis report

Static analysis result for SHA-256 609628227295dc67…

MALICIOUS

PDF

78.7 KB Created: 2021-04-02 05:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ec2d1e78c59eaf26fb3eff6037dc1954 SHA-1: c106a0a75f4e32ab65d5e63f2914ab6f93219bd4 SHA-256: 609628227295dc671e2c82bab63f7da4b1e70558c5de63cf96d62ccac25898a2
96 Risk Score

Malware Insights

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

The file is a PDF document flagged as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'https://maypoin.ru/award?keyword=astronomy+merit+badge+book+pdf', which is likely a phishing or malware distribution lure. The document body is heavily obfuscated, but the presence of the external URI strongly suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/award?keyword=astronomy+merit+badge+book+pdf PDF link annotation
    • https://cdn.sqhk.co/kekumumaxow/ianzh2k/warframe_crossplay_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/Bighchg/the_walking_dead_wallpaper_4k_phone.pdfIn PDF document text
    • https://cdn.sqhk.co/xafeperale/qidorNK/yellow_lights_lyrics_hudson.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/ZI8jcqP/bugaxovonitisa.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/gjifIgi/powupuluwuda.pdfIn PDF document text
    • https://cdn.sqhk.co/mukibusu/jgejhnl/pedegorixunotunapumu.pdfIn PDF document text
    • https://cdn.sqhk.co/rowagana/U2ibwo1/happy_birthday_video_song_telugu.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/ieGdsss/sleep_recorder_app_android.pdfIn PDF document text
    • https://cdn.sqhk.co/vejuwami/fRjdmRL/vabutimi.pdfIn PDF document text
    • https://cdn.sqhk.co/rokijatu/wyhh3ke/28557151836.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/nhcDjac/norevavudinegujebunoji.pdfIn PDF document text
    • https://cdn.sqhk.co/jitegoji/dQ8NLhF/56431084930.pdfIn PDF document text
    • https://cdn.sqhk.co/moviferu/Dmigieq/warlords_battlecry_2_free_download_full_version.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/kib1lhb/73891156181.pdfIn PDF document text
    • https://cdn.sqhk.co/karadirimose/dCibxic/play_plague_inc_game_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/vavetiset/ibahflN/zunoxavir.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/wivunonovef/gramatica_espaol_a1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff5a9718-0006-4c2d-92dc-a69784e145a8/how_do_you_reset_a_dsc_alarm.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/vidmate_apk_free_for_android_uptodown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56915af9-965f-4bff-988f-f2d8ffd2bae5/how_much_is_samsung_smart_tv_55_inch_in_nigeria.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_off0000f56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56C 5624 bytes
SHA-256: a78ad7b3cd456d1fa744ba7677bea5157e485efd165f76840a0b02df03dd2107
font_01_sfnt_off00010888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10888 10948 bytes
SHA-256: c72f665f0bc1a86174adb239bb49d2b9f851c5b226b531784c0aaea2a4411631

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