Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a324fc458ce2305…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 13:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ee68b3f412aa93fe8256e02165f4a3f2 SHA-1: 73e81c38ee814394ab9daa0d10a990d59f5ce333 SHA-256: 2a324fc458ce230553712f94e2732053df76472f0fcba17f9c0084679c553a74
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, with many pointing to disposable hosting, characteristic of a link farm designed to distribute malicious content or phish users. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, indicating a large number of distinct hosts with a single link each, likely to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://imagebeaute.fr/userfiles/file/53139575985.pdf In PDF document text
    • https://healthmatters.me/userfiles/file/76242840611.pdfIn PDF document text
    • http://sjanzee.nl/file/meripedaxulenaxekalujux.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/33093487157.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/62887492225.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/92111592760.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/rorelafuzotoguze.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/25044139993.pdfIn PDF document text
    • http://tion.hu/upload/file/kilatuxejekudoxowagan.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/donilomuneruwujuk.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/nunibima.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/14907231067.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/60974225049.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/62362610095.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/jegikuwusisaba.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/gesotasab.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/zutizawonike.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/16545401791.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/nebesifazovaxedumu.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/87568913755.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/nezifawavutedexu.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/muripuneledevik.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/73362671895.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/19031088160.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/nenobekewamodogol.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109061449219027.pdfIn PDF document text
    • http://elpijisystem.com/file/37184324284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=adelaide+bus+map+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_off0000dac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC3 17044 bytes
SHA-256: fb38613a20285b386cb5d07a9cafbd0ebb06c4f7e61d15a827dfb07e242f1787
font_01_sfnt_off0001070c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F23 10460 bytes
SHA-256: 94673bc3893faa5a970e0ce964ae8108349e6cf15cecad3d05b45a3069575cf5