Malicious PDF — malware analysis report

Static analysis result for SHA-256 96e4ffa24bddfadf…

MALICIOUS

PDF

78.9 KB Created: 2021-04-02 05:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b727171ddbc9f1b7bfb75170b68527e SHA-1: deea68bfed817522cd246870d034891e790e5e43 SHA-256: 96e4ffa24bddfadfa18492d7c04e384bc659dd7a10b2523c5877703555368366
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, suggesting a tactic to drive traffic to potentially malicious sites. The embedded URLs, such as 'https://kuzutuzo.ru/wix?keyword=preguntas+biblicas+faciles', are consistent with phishing or SEO manipulation attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/wix?keyword=preguntas+biblicas+faciles
    • https://cdn.sqhk.co/xezafube/Qhghchj/shadow_fight_2_pc_system_requirements.pdf
    • https://cdn.sqhk.co/zigotimuti/jHx8Kdl/buganugakanisitarinidiwu.pdf
    • https://cdn.sqhk.co/tuteremekome/YvH8Q3F/last_run_dead_zombie_shooter_mod_apk.pdf
    • https://cdn.sqhk.co/wugolekufo/gdheifi/fast_launcher_android.pdf
    • https://cdn.sqhk.co/tamejenonisi/fgghaha/68620764038.pdf
    • https://cdn.sqhk.co/musarawaw/gLGheC4/46386495036.pdf
    • https://cdn.sqhk.co/riwaxagi/DGjdaeM/how_to_apply_iron_on_vinyl_with_iron.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lemerisinivum/does_lara_jean_end_up_with_peter_movie.pdf
    • https://s3.amazonaws.com/woxewiwupir/20606728989.pdf
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_c94211801cae4b4a8e6374bda650885a.pdf?index=true
    • http://wetovokerug.epizy.com/creole_english_dictionary.pdf
    • https://s3.amazonaws.com/belapawerezuju/19500201947.pdf
    • http://fujusup.epizy.com/33989445117.pdf
    • https://s3.amazonaws.com/biwubeleba/fabric_softener_sheets_static_electricity.pdf
    • https://s3.amazonaws.com/xapota/best_drug_guide_for_nurses.pdf
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_b09cb7d4049c49a184159b0454eab0f8.pdf?index=true
    • 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_off0000f55a.bin
22c1a057602aea721dddd1ae79df284110d6cbb14640ea7bbf121b20d427f3af
pdf-font-stream PDF embedded font (sfnt) at offset 0xF55A 5192 bytes
font_01_sfnt_off00010714.bin
a8a84c71239c1ddc26c67521f62767685f4b4a60425b90ac6802010b9bd12ac9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10714 11792 bytes