Malicious PDF — malware analysis report

Static analysis result for SHA-256 4017165638a80f48…

MALICIOUS

PDF

80.3 KB Created: 2021-09-10 17:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e0317e143ba5ae69de78a4a4a4234475 SHA-1: 25f2ba676ec28b79cfe4549ff89669447a5f69ed SHA-256: 4017165638a80f48a0f7489f4bbde6ca345d7e9b61f012a2e0daa97a4679445f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs, many hosted on disposable domains, strongly suggests a phishing or malware distribution campaign. The ML classifier also indicated a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://smidgel.ru/uplcv?utm_term=can+i+mirror+my+phone+to+my+tablet PDF link annotation
    • http://okzawidow.pl/img/upload/files/33929699808.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021090511832_456152400.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/gefufinovuxarapanejuzulug.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/11086238176131877bc2d62.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/8424478917.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/busafaj.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/21744588260.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613509cac107e---tutikisog.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/79927443502.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/34773523507.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/jesegidido.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/50831223268.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/juvexi.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/39711697752.pdfIn PDF document text
    • http://inica.org/files/file///gikitujota.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/7652993214.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/235071589.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/93492841985.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/27698483160.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/vutifarutekolasadik.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/ruweguforop.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/vezirorugipazodusa.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210907083140.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210910_B423A51C5DB8F3CF.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://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_off0000d449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD449 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC60 10636 bytes
SHA-256: c196839872255a499d798562f3b6e9d2df8066d9338ab4dff947ac4f83648d67
font_02_sfnt_off0001043b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043B 18244 bytes
SHA-256: fc8283b1afb55834800ccf5c39115e7a43ae91e541bb720d7254b695dc789481

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