Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf9c7a3c96c086b…

MALICIOUS

PDF

72.1 KB Created: 2021-04-07 03:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: dace857f50642c43a19694484f911cc8 SHA-1: ed5e0c0a43c587ceb21eba7ddf598816a5c07891 SHA-256: daf9c7a3c96c086b92b37979e1748a3fae186efe3216c9a77c2e38726178e91a
96 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, specifically as a phishing trojan. It contains an embedded URL that directs users to a suspicious domain, likely to deliver a malicious payload or phish for credentials. The document body, though heavily obfuscated, contains text that appears to be a lure related to educational notes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/award?keyword=benim+hocam+vatanda%25C5%259Fl%25C4%25B1k+ders+notlar%25C4%25B1+pdf PDF link annotation
    • https://cdn.sqhk.co/jesotipo/PhfMOgf/cach_quay_clip_bi_n_hinh_tren_tiktok.pdfIn PDF document text
    • http://nepatokada.mypressonline.com/zubokivewuzerot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477401/normal_605d9d24cc0d5.pdfIn PDF document text
    • https://cdn.sqhk.co/bosesegivu/YiaiivD/football_predictions_soccervista.pdfIn PDF document text
    • https://cdn.sqhk.co/muzedikerum/xqVjchc/horizon_zero_dawn_pc_camera_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/sesijisova/jchieg6/negiloribe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369922/normal_60556bf9f12f6.pdfIn PDF document text
    • https://cdn.sqhk.co/rapigufagi/igicWji/best_buttercream_frosting_recipe_for_decorating_cakes.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/gulapore/16961413908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49b70a64-1ac6-408c-99ad-a195f506f0e7/how_often_do_babies_poop_breastfed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba36f523-96dc-4940-a4b2-1c7175d9d91e/minuet_in_g_minor_bach_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/bilubojogapaxusura.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/44336358374.pdfIn PDF document text
    • http://baletax.onlinewebshop.net/definition_of_symbolism_in_literature.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/navevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5df10f7b-3361-45f4-8bbd-e90f35377bde/the_texting_bible_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cecca4f-a49f-46d4-9d32-6f8875b7d786/gedolela.pdfIn PDF document text
    • http://begujewirefe.myartsonline.com/88822021060.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30891823-1b00-4ef1-804c-13312bef5560/the_sea_of_monsters_chapter_1_summary.pdfIn PDF document text
    • http://jimarol.myartsonline.com/56848628291.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/history_of_benin_empire.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_off0000d761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD761 5848 bytes
SHA-256: 96ce2f094ba15a161f3d863a9f74aef2c8cb0a7c796214d8739f80fce8e39996
font_01_sfnt_off0000eaa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA8 12036 bytes
SHA-256: 37af43efe629aa7abc299803fbcaffa3c0cdf5cb0780484520747672b39be643

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