Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a4fee7e6e8043b…

MALICIOUS

PDF

68.8 KB Created: 2021-09-28 11:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3ec53ce112f8146c01eb5fc70300333b SHA-1: 0295c4626c484e1f854e8e3461c7282cf7f52afb SHA-256: d5a4fee7e6e8043b3be68054ab04f113fbf8c6a639f0568506d5ed79350f6459
126 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous external URIs, many of which point to suspicious PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the document is designed to lead users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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 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 https://conexusinternational.com/ckfinder/userfiles/file/nejiroxotirubufevi.pdf In PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/dapidukezoladinigiko.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/78455511905.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/56635844589.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/89628079172.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/99579101915.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/ditovebiwesozog.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210914025851.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/rejulojupafivanaw.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac34c8f1b4---95831837638.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/43556559662.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/40711903985.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/60825789173.pdfIn PDF document text
    • http://npas.ru/pic/file/38706281947.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/86112186289.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/rotixigasefirepopap.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161371ba1d5d6d---96409419864.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/429668809613168a95ec09.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/39500400592.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210904_B0BA403B4B9CE1ED.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/25935955896.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/27202622605.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/25973397844.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/60546087027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=android+vs+robot+vs+cyborgPDF 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_off0000b020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB020 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC837 10504 bytes
SHA-256: 55a00b36b3d00beac85f8246ffe41a5c0bf23f311fc8f55957a6975b5530d80e
font_02_sfnt_off0000e014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE014 14764 bytes
SHA-256: 955c9a09f8e3ffd3fb40b9c9ef3786f4cb48567b85ec387d565c30308b70ce17

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