Malicious PDF — malware analysis report

Static analysis result for SHA-256 294843505ebb20b8…

MALICIOUS

PDF

84.3 KB Created: 2021-09-15 09:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 795e679b06708c3c32ebc40cbd2877e5 SHA-1: 205ed6f8a0f2f7f795f4c05ab66dceb8fe59cb31 SHA-256: 294843505ebb20b8549d6e8887472c75349ccdf54413daa1fe30807e5447d95b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting, indicating a link farm designed to redirect users. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, suggesting the document's primary purpose is to distribute links to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://medvor.ru/uplcv?utm_term=how+to+create+hidden+folder+android PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3ec2b8eb3---22984293580.pdfIn PDF document text
    • http://airmon.hu/images/files/rudejuvoz.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/jivelogajopidatufatele.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/95464510160.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021090721062179.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/67660947875.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/sases.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/65541406632.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/69416452265.pdfIn PDF document text
    • http://dogable.de/userfiles/file/78695712029.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/maxewag.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/ruxuvogogutigizerizabek.pdfIn PDF document text
    • http://edituj.cz/res/file/71599149422.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/nizowumipuberid.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/24487072221.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/rotuvota.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/soxofenivifite.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/59441503488.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/wulisijojepavupe.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/wuragifuvela.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/zesosutujuvidizifageke.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/50972757152.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/lodelexapadiwitibadika.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109141205481747.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/37395615722.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/vozosiredemokugupasuxode.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_off0000dd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD03 20772 bytes
SHA-256: c023ccbe9cf961ee6d37d4e0c29b05c7609bf4c1dc306fa0af06703b8a3286fb
font_01_sfnt_off0001135f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B76 10484 bytes
SHA-256: 01b94770baad96aa232ba03469f37457a16cbb14488327bf31aebaf83aa93e22