Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfbfb55316b3381d…

MALICIOUS

PDF

71.6 KB Created: 2021-02-05 11:08:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 0e10df05c98fea932a3bd30140ac45bc SHA-1: 266efa88c0dce68d21bb2e62ee8b7bd3a4fff57b SHA-256: cfbfb55316b3381d8c19187ff4aa178474dd89a13fb515484e72bf4fd8e9dcd3
96 Risk Score

Malware Insights

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

The PDF document contains an embedded URL that directs users to download an application, masquerading as a caller ID blocker for Android. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the overall detection score suggest this PDF is part of a phishing campaign.

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://jacksth.ru/aws?utm_term=caller+id+block+app+for+android PDF link annotation
    • https://cdn.sqhk.co/dijobika/2QgdPjc/best_usa_dating_app_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/nexuliwadi/gehij7H/fruit_ninja_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/mekizojo/Rhjrcib/hero_evolution_mod_apk.pdfIn PDF document text
    • http://zikemipirelojo.22web.org/maplestory_m_phantom_weapon_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/demanajinu/jZhghcl/58489677660.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvutose/gjijghD/66714796076.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/iahgxgg/31956829195.pdfIn PDF document text
    • https://cdn.sqhk.co/fezivabuja/hghmygj/ps1_emulator_mac_2019.pdfIn PDF document text
    • http://consumer-data-protection-bureau.com/99710288461yixwu.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/xhjgfhe/royal_offense_2_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxevabuvix/4lUhage/image_to_video_maker_app_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jenotonolo/lfGPngd/fist_of_fury.pdfIn PDF document text
    • https://cdn.sqhk.co/jomububorava/eihR7H6/mcps_portal_homepage.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/kudufigunabi/81936536777.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/xoleso.pdfIn PDF document text
    • http://roxewew.epizy.com/jokogunoguwodoto.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/91934470984.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/79698642629.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_off0000dc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC11 5080 bytes
SHA-256: 9b82fac5eaf184ec64440d8cf1bceeade4b6d558f5e7c7f7d994a28845dc8f34
font_01_sfnt_off0000ed65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED65 10476 bytes
SHA-256: fb4a8fef8685b9f873c9f296194fd420955b01b2ad4cbbdb6cb870ddcf8f5844

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