Malicious PDF — malware analysis report

Static analysis result for SHA-256 733461e2d0a8676e…

MALICIOUS

PDF

82.0 KB Created: 2021-04-06 02:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c4c6493a4ecc2e9b101b3ca1429296a SHA-1: d7e5da7acf8623607098a44c9c75a40a186cd6b8 SHA-256: 733461e2d0a8676e94bf3e95f13cc87bd3b114d100fb3facac5c98ba0a3f4d93
136 Risk Score

Malware Insights

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

The PDF document is detected as malicious by ML classifiers and ClamAV, and it employs a social engineering lure to trick users into installing a fake browser update. The embedded URL `https://xezojetit.ru/wix?keyword=failed+to+load+pdf+document+in+chrome+browser` is likely part of this lure, aiming to download a secondary payload. The document's content and heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://xezojetit.ru/wix?keyword=failed+to+load+pdf+document+in+chrome+browser
    • http://makedctl.site/53367179166hor7a.pdf
    • http://anyita.space/459289271269701v.pdf
    • https://kufavugozit.weebly.com/uploads/1/3/5/3/135309998/2f9afb07a.pdf
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/9393930.pdf
    • http://4bochki.ru/new_testament_bible_study_lessons9zl74.pdf
    • http://app-3null.com/mathematical_statistics_by_pr_vittal_free_downloadyl6pd.pdf
    • http://unreguezff.rest/coleman_inflatable_hot_tub_error_code_e02hivt3.pdf
    • http://prazdnikprosto.ru/dezesanawigonetujuxifenikbv1c.pdf
    • http://copyrightsupport-ig.com/coliform_mastitis_histology2ugdw.pdf
    • https://rafutukeri.weebly.com/uploads/1/3/1/4/131453201/vojuxewu.pdf
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdf
    • http://pitushok.fun/blunt_condensed_font_free_downloadbo1la.pdf
    • http://maturibcgj.space/46337442366qdze4.pdf
    • http://expressvpn.store/codon_chart_definitione2bai.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mulerux/best_html_css_php_editor_for_mac.pdf
    • https://uploads.strikinglycdn.com/files/e701de23-7bcb-4980-a060-e34bb17c0bf7/how_to_stretch_strappy_high_heels.pdf
    • https://uploads.strikinglycdn.com/files/361f9fda-9445-4132-9006-e469639b5b9a/sports_illustrated_magazine_online_free.pdf
    • https://s3.amazonaws.com/petikamov/ergo_360_front_facing_instructions.pdf
    • https://s3.amazonaws.com/pexodugosa/kogomepedixuviliwuxab.pdf
    • https://uploads.strikinglycdn.com/files/f6eec3eb-c94f-4c53-b0c6-2119788585ff/dungeons_and_dragons_4e_books.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb4.bin
9f8483aa8974d99a126de2853afbdd5a4da41bc38058d49aefe5c013fa8f971f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECB4 5584 bytes
font_01_sfnt_off0000ff94.bin
9084492f494404f235de36d783b09e10f6e212dce32b5baa971495c277694cb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF94 11028 bytes
font_02_sfnt_off0001255d.bin
9853a4a918762215dfcba51349555ff48d39e56332efe18e2f333ca30d8a5b61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1255D 16096 bytes

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