Malicious PDF — malware analysis report

Static analysis result for SHA-256 da54b32f019411db…

MALICIOUS

PDF

81.2 KB Created: 2021-09-11 00:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ff42cf16c83a588eb88cc1aa320e0077 SHA-1: 91ed7c28a872cc909d2ae8c8aa92e1ab3b9ef04e SHA-256: da54b32f019411db3c722cd9c0411434888c72e105c839c0f5a14fd38ffcc556
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 https://smidgel.ru/uplcv?utm_term=how+to+turn+off+notification+sound+in+redmi+note+9+pro PDF link annotation
    • http://art-ball.net/files/file/3600178846.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/32836711932.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/88020193190.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139409d2b76e---nobakaxis.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/46001074370.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/lobufotanasudibevemoli.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/11666447410.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/mikulekojevani.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/fobedapiwuvipesojenawor.pdfIn PDF document text
    • https://best-label.com/upload/files/xufepanetefesinabopaw.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/12648961352.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/38704580493.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d56d43ff689ce986485920ffff8b6002/garizafabukolekanijer.pdfIn PDF document text
    • https://arerp.kr/data/file///mipif.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nonibofojuz.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/simumos.pdfIn PDF document text
    • http://laserinnsbruck.com/static/rivaludutaveb.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/galupizolobivevaje.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/51335257356.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/46680630026.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/89221055489.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/naxumuke.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/61310070996.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_off0000d554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD554 18256 bytes
SHA-256: 90a7ff5f9325ebe3211816176cf5584136be5155ebed2b125480b6c553ae5dbc
font_01_sfnt_off000104cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CB 11080 bytes
SHA-256: 33da000ad0ac6e9254cce5981d479698ad1b838ec3b9cfed1b40be5247695246
font_02_sfnt_off00011eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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