Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3bbf25b44937614…

MALICIOUS

PDF

75.9 KB Created: 2021-02-27 23:55:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 2730ba9c22ae5bd3d640c426c0d0c769 SHA-1: c10f392703b01325b6c5b6152c90b8b38c6d031c SHA-256: c3bbf25b44937614d94337e47737443e8346f8f7a69a6bfd4b2b56a3df563f98
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and employs social engineering by presenting a fake download button and a lure to install a browser extension or update. The embedded URL `https://leonvi.ru/wix?keyword=download+criminal+case+save+the+world+cheat` suggests a phishing attempt related to game cheats or similar lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/wix?keyword=download+criminal+case+save+the+world+cheat PDF link annotation
    • http://fibisazorowax.mypressonline.com/fuzinekoj.pdfIn PDF document text
    • http://qiwi-wallet.online/71189525352l3kf9.pdfIn PDF document text
    • http://golixudib.mypressonline.com/kegividejeda.pdfIn PDF document text
    • http://koxelovanalimu.getenjoyment.net/mitovitobino.pdfIn PDF document text
    • http://japancar-sib.ru/kefon19xz3.pdfIn PDF document text
    • https://cdn.sqhk.co/xaselavub/gjhhfjh/76737151117.pdfIn PDF document text
    • https://dutizadip.weebly.com/uploads/1/3/4/8/134889078/1a8e996ad6f165a.pdfIn PDF document text
    • https://cdn.sqhk.co/sawijewabob/GMRibL4/subway_fun_runner_endless_runner_games.pdfIn PDF document text
    • https://cdn.sqhk.co/fubemabofof/igE39ja/nail_designs_2020_ombre.pdfIn PDF document text
    • http://kellys.space/final_fantasy_7_remake_original_release_datet66ae.pdfIn PDF document text
    • https://derufobi.weebly.com/uploads/1/3/2/6/132682106/nakofawul.pdfIn PDF document text
    • https://cdn.sqhk.co/murofoli/bihNCij/ancient_aliens_game_crash_site.pdfIn PDF document text
    • https://cdn.sqhk.co/simikimira/igjfjg8/ielts_vocabulary_words_list.pdfIn PDF document text
    • http://marinarus.space/timojesunagagusakifexigqhbz.pdfIn PDF document text
    • http://xozonline.ru/77204324725y2aaq.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/mamukawaxatali/strategic_communication.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/lumanadal.pdfIn PDF document text
    • http://rogofideb.onlinewebshop.net/nada_carmen_laforet_resumen_y_analisis.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/happy_wheels_full_game_pc_free.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_off0000ed85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED85 5332 bytes
SHA-256: 9a71103d26990499886c73ce0009d29531c0d906f97fc80b9803db086dd01f7d
font_01_sfnt_off0000ff96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF96 10040 bytes
SHA-256: 45344db4cd70f05ad798c41a059bcd3aefe317a33180664f061c6b2577ca4a2b

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