Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef6c014f1ff9745…

MALICIOUS

PDF

74.6 KB Created: 2021-03-15 21:27:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de5cb6064d7aadc8e3cc3606d10c02eb SHA-1: c907d1eefc7a03fa87f96e14b161fa3dbe59adb1 SHA-256: 7ef6c014f1ff9745676dcfe5cc84ab00a27f5e28f7764c2130f847fd7a34358f
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to 'https://jacksth.ru/award?keyword=aldehydes+and+ketones+mcq+pdf', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be related to academic material, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/award?keyword=aldehydes+and+ketones+mcq+pdf
    • https://cdn-cms.f-static.net/uploads/4459483/normal_602b492541e72.pdf
    • https://static.s123-cdn-static.com/uploads/4494140/normal_5ff5c5402f50e.pdf
    • https://static.s123-cdn-static.com/uploads/4456398/normal_5ff95527f1128.pdf
    • https://static.s123-cdn-static.com/uploads/4457876/normal_5ffd0d77825a6.pdf
    • https://cdn-cms.f-static.net/uploads/4475588/normal_6036343bd1c72.pdf
    • https://cdn.sqhk.co/pulisamog/hiehiIR/human_fall_flat_2_player_split_screen_ps4.pdf
    • https://cdn-cms.f-static.net/uploads/4486765/normal_603a56614aa22.pdf
    • https://static.s123-cdn-static.com/uploads/4426941/normal_5fdee9590e9b9.pdf
    • https://cdn-cms.f-static.net/uploads/4393508/normal_603d75ed0cc4d.pdf
    • https://cdn.sqhk.co/remozemot/mifdXBO/eikon_loan_connector.pdf
    • https://cdn.sqhk.co/ponesigis/efvDjfZ/ink_master_host_fired.pdf
    • https://cdn-cms.f-static.net/uploads/4500001/normal_60349f74bb494.pdf
    • https://static.s123-cdn-static.com/uploads/4374360/normal_5ff62ba0817c6.pdf
    • https://cdn.sqhk.co/zovitamojim/nZgfhg5/retroarch_gameboy_advance.pdf
    • https://cdn-cms.f-static.net/uploads/4479688/normal_604e39b89cde4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mugevewobota.rf.gd/jimmy_choo_choo_new_song_video.pdf
    • http://wozurusezop.rf.gd/vugodoji.pdf
    • https://s3.amazonaws.com/vaxebisapesi/the_master_book_of_candle_burning_free_download.pdf
    • https://s3.amazonaws.com/jebupofedijakuk/devenir_famille_d_accueil_chien_guide.pdf
    • http://dagepirobalov.epizy.com/auditoria_informatica_gonzalo_alonso_rivas.pdf
    • https://s3.amazonaws.com/jenisozazewubo/goxetotesejolexorexatenip.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_off0000e3d5.bin
6bdd6e36599e1ad588866b240136ed967359b68b869af15b8b2b03cb09731b6e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D5 5580 bytes
font_01_sfnt_off0000f6b9.bin
eb89bc39e21eae92cee94a5c52a18a6f107a7fb7165da2e8f0897a2347f6a42b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B9 11280 bytes