Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c718b715ecd72bb…

MALICIOUS

PDF

80.6 KB Created: 2021-09-08 18:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e78873afa10ab090cca39abb5384a566 SHA-1: d8429aa3dcb1205ed3ab934431ebe16271a0317f SHA-256: 3c718b715ecd72bbe3076cfb82c7a3a152f093028436909184b74727e6fe2faf
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URLs, many pointing to PDF files on potentially disposable domains, suggests a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a pattern of using such domains for SEO-based redirection, likely to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://mylodge-naoshima.com/24053776436.pdf In PDF document text
    • http://emilygrilltogo.com/uploads/files/vuxixuxogine.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/95183954285.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/joxozibafufipu.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210907_1C8D518A79A6AE4E.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/dodupitukanelabaf.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133244130927---74976478498.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/gutakoxevav.pdfIn PDF document text
    • http://www.buildonhope.org/file/fitibitorisunitepodutiw.pdfIn PDF document text
    • http://a899.net/userfiles/file/fakekupixojazozojenetugeg.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/32700366622.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/18744746388.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/71440941351.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/50576426300.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/gefeloxemutawazefewiw.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/18070738264.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161318e7cc1a0a---lutatipufitiruxe.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/jixekebe.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/wutunufopa.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///87436030142.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/24706392010.pdfIn PDF document text
    • http://mobiliteit.nu/files/tojebunuvojafes.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/24088260125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pre+purchase+inspection+checklist+pdfPDF 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_off0000d981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD981 10908 bytes
SHA-256: 7417b86a0e4aecbbcc7f21e75b4d4c9d00f14f32807b3ec162b762d7f7d23471
font_01_sfnt_off0000f2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AF 16228 bytes
SHA-256: 47daada1dbd0e719f95ecafccf03d91a67ebcf255915a7b1b30d995d6c35921f
font_02_sfnt_off00011c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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