Malicious PDF — malware analysis report

Static analysis result for SHA-256 54bd4bebff88ad3b…

MALICIOUS

PDF

75.7 KB Created: 2020-11-25 17:23:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4457597cdaf09a9e2d78f6875bdec0f2 SHA-1: 9e99d0cda94e6e39ac31f77cc279d94abb080818 SHA-256: 54bd4bebff88ad3bd58e702670459fa487885d8bf1d2f95af49e1e07e665e37d
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains numerous external links, with one heuristic specifically identifying a 'Browser extension / update installation lure'. This suggests a social engineering tactic to trick users into downloading malicious content or providing credentials. The presence of embedded URLs further supports this, indicating the document's intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://trafffe.ru/123?utm_term=pny+32gb+micro+sd+card+walmart PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446638/normal_5fb2e0c0aedf4.pdfIn PDF document text
    • https://rovumixonisi.weebly.com/uploads/1/3/4/0/134012407/e93568deb6d392.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_5f873f16e760b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467927/normal_5fa833ee607d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365660/normal_5f8727fe913fc.pdfIn PDF document text
    • https://somanenor.weebly.com/uploads/1/3/4/4/134472611/mejaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420468/normal_5faa826262087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374207/normal_5f9538597c716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379045/normal_5f8e6ff742470.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3ca81f96-9765-4a67-8e80-001a88e2cfd4/world_s_hardest_game_4_vendor_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c192b6b8-aa11-49cb-9ba0-22ecde8c2593/vomusalod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b893c6a2-d449-46c0-949a-996c23b644b1/mechanical_engineering_interview_que.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a5f57a1-fa4e-4424-976e-9f14239a4197/84014299281.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40945fc4-d687-4191-a00c-8599ecd4f6cf/hutchinson_clinical_methods_23_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/79118028815.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5B 5560 bytes
SHA-256: 8e3e6bfc3f4c09dfb2d25ad1a6aae3b4915d341a14d7c0c50e8ee7b6483de366
font_01_sfnt_off0000ed27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED27 11104 bytes
SHA-256: 0d58517ec626f742223d98eca6eeca8ff9d338efd3cb7d3463ebdbd2a69b5400
font_02_sfnt_off00011254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11254 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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