Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c52d24ac37a37a3…

MALICIOUS

PDF

85.0 KB Created: 2021-09-16 03:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 32d30de3c8d3dc5438c3ee577320c34d SHA-1: 89ad04e793af7e6ce964670da8de4ec83287168c SHA-256: 0c52d24ac37a37a34b5eface28fc76997cf5ef464d178c8984b3c972a7dcce1e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. The presence of numerous embedded URLs, many pointing to disposable domains and configured as a link farm, suggests a phishing or content redirection attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to lead users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • 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 http://captaincook.hu/userfiles/file/93203677265.pdf In PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/0c311caa06a1ac710276bbf436acb732/75127923734.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/wiripuwotigowunojeliwug.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/95541734481.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/23728292872.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/1839193681.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/65413353588.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/nulakiwafadopox.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/95087543321.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/93225367452.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/dibuweri.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/39680532844.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/semesapofugobiwadubug.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/zosotojakomubewu.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/94252866001.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/fodosujolivir.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388c7c6785d---25530279418.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/16850423159.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/69202112110.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/30836785140.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/34181178271.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/xebemeb.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/fotosixinuwizamufokizutas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=best+games+for+android+in+indiaPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA88 17024 bytes
SHA-256: 52dba8e49a32945ac345c48d607810b09c41ee43c8424fd80c9e6e83d1f8e12d
font_01_sfnt_off0001165b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165B 10704 bytes
SHA-256: 10fe0f036af1a25f4cfc6e8142e3679edbc397ac16eeaa82eb342840950d5870
font_02_sfnt_off00012ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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