Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbcb56796bd27e44…

MALICIOUS

PDF

148.7 KB Created: 2021-03-17 18:03:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 612184a6bce3a790222b8df45ff0c45c SHA-1: 93160f12125116fa3fe3c821abdcd21fdc0a9503 SHA-256: cbcb56796bd27e4422bbe975c130751cae6da662ae5683e7ffa7ae09ac74b4b4
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that points to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF with a high probability of being malicious. The document body, though heavily obfuscated, appears to contain metadata related to its creation, suggesting it was generated by a tool rather than authored directly. The presence of an external URI firing further supports the malicious intent of directing users to a potentially harmful website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://zajinet.ru/strik?utm_term=when+was+brown+vs+board+of+education+decided
    • http://support-copyrighthelpservice-about.com/nostalgia_electrics_cotton_candy_maker_extractor_head_replacementvmqhb.pdf
    • http://parhelifrl.space/how_to_get_damascus_modern_warfarerbscr.pdf
    • https://cdn.sqhk.co/kipebakebe/xHgfjhI/ruvamafowikiziwi.pdf
    • http://gemunoz.iblogger.org/bpmn_2._0_tutorial_for_beginners.pdf
    • https://cdn.sqhk.co/jiluputumusi/jaiaHjg/kopubonesafof.pdf
    • http://pelaberofusej.iblogger.org/epidural_anesthesia_in_labor.pdf
    • http://idealicaitalia-ufficiale.site/bokowababolemamaxn95.pdf
    • http://5coupon.info/tcp_ip_reference_model_in_computer_networks_ppthocus.pdf
    • http://zavodtriumf.com/sex_and_the_city_movie_poster02c8p.pdf
    • https://cdn.sqhk.co/wimedizi/ov9jjgf/78116651737.pdf
    • https://cdn.sqhk.co/xusawikorut/sjdhfK4/superhero_cartoons_painting_coloring_book_games.pdf
    • http://kijewumiw.iblogger.org/rujepewoxosevam.pdf
    • http://brumbum2.xyz/108420370954ojpy.pdf
    • http://raisinsapp.club/bagawema618.pdf
    • https://cdn.sqhk.co/nomevagume/a6rtjif/bevonipoxezewavozerabojib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rapevuf.epizy.com/how_to_use_ebt_card_online_target.pdf
    • https://s3.amazonaws.com/xarojapi/lion_air_crash_report_2018.pdf
    • http://mevuzulutifoxa.rf.gd/bezelye_dergisi.pdf
    • https://s3.amazonaws.com/kiwopusafize/c_programming_language_full_tutorial.pdf
    • http://sefenepisepaje.rf.gd/12613480267.pdf
    • http://ligededeju.epizy.com/barcelona_vs_liverpool_first_leg_formation.pdf
    • http://vikogen.epizy.com/the_human_centipede_movie_in_english.pdf
    • https://s3.amazonaws.com/kewuxejikiwe/xofevuxuzurozakejaxa.pdf
    • https://s3.amazonaws.com/xapota/action_adventure_offline_games_for_android.pdf
    • https://s3.amazonaws.com/vovopafubipu/1315117016.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_off00020927.bin
9a00fb643a80b383759d60bdf0d4242fd3d6fb5569bbf630bfe8a5a4f2c70a8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20927 5384 bytes
font_01_sfnt_off00021b8d.bin
fdcab4d5ec54e5695246cae2f0c1c23fecb959f1605f00d8674476f37cd3eecc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x21B8D 12112 bytes

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