Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b29726c5f86f493…

MALICIOUS

PDF

75.0 KB Created: 2021-03-26 08:24:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31cafdf9e0d4ca8bf64c6322e18a09fa SHA-1: 839160625279622459dc3ee97eea114aaba94676 SHA-256: 4b29726c5f86f49322347c72c3abfde07dad72e4e9e2abc0dca533c6d3b340af
104 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating the presence of an external URI and a visual download button. The embedded URL points to a suspicious domain, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the overall pattern indicates a likely attempt to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/award?keyword=cvc+words+phrases+and+sentences+pdf
    • https://cdn.sqhk.co/dojaxeje/dHf1jf2/free_ringtones_for_iphone_8_plus.pdf
    • https://cdn.sqhk.co/jaxubefe/iijmjg6/best_formal_dress_shop_sydney.pdf
    • http://boxijogirexu.medianewsonline.com/border_gateway_protocol_tutorial.pdf
    • https://cdn.sqhk.co/vasegodesazu/hMxGibi/digifabepakexuxajuzomes.pdf
    • https://cdn.sqhk.co/jigitovewuk/cT5Zhgw/posutisikofu.pdf
    • https://cdn.sqhk.co/runudori/aOhegdQ/drinking_games_with_ping_pong_ball_and_cups.pdf
    • http://belugol.22web.org/phonetics_and_phonology_noun.pdf
    • http://sowakowakemim.mygamesonline.org/nudesowuza.pdf
    • https://cdn.sqhk.co/lixozimiz/eIgdgcY/66380354786.pdf
    • https://cdn.sqhk.co/kigaratak/gcjeR1G/mlb_network_games_on_tv_today.pdf
    • https://cdn.sqhk.co/gepeduvo/hfbTjjS/word_search_online_free.pdf
    • https://cdn.sqhk.co/lazemowul/ap98M1Q/sebejibe.pdf
    • https://cdn.sqhk.co/labojime/jjYTMG4/stress_balls_gummy_supplements.pdf
    • https://cdn.sqhk.co/valujoper/idLifie/meme_generator_pro_free_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://povumuvepu.epizy.com/anti_slavery_monthly_reporter.pdf
    • https://uploads.strikinglycdn.com/files/3a078ffe-9e26-46a2-927d-a3fd57c078b7/how_to_create_a_new_user_role_in_wordpress.pdf
    • https://uploads.strikinglycdn.com/files/e4fe111b-700e-4f8d-8608-3859caab50ee/suny_wcc_faculty_directory.pdf
    • http://jetumodegupejit.rf.gd/2601767160.pdf
    • https://uploads.strikinglycdn.com/files/e2fbdf11-a026-4448-ad31-7df357542154/47544540933.pdf
    • https://uploads.strikinglycdn.com/files/4c91010f-b4c1-44c3-abe9-ddca2fcd0cfb/how_to_sing_christmas_carols.pdf
    • http://vobogiv.rf.gd/android_reply_to_iphone_group_text.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e134.bin
012fe1c4c6fa63785667cef5f22f5551bff36fe8ab19cec796caab60e723956f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE134 5124 bytes
font_01_sfnt_off0000f2a3.bin
1d566284f285233ebc463baf148623b82b50b5fed986d89383b7e6be2a1973ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A3 10612 bytes
font_02_sfnt_off00011709.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11709 4324 bytes

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