Malicious PDF — malware analysis report

Static analysis result for SHA-256 960399624519c0de…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 12:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5d34243233707bd6d4163269928c1d4d SHA-1: b215abd586a4a3a94b71351f1c3dbd265e49291a SHA-256: 960399624519c0de88ad34301b9645136ed93ed0d05f1247e948f0c8cce8bf16
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, despite some being marked benign, suggest an intent to redirect users to potentially harmful sites. No scripts were extracted, but the overall structure and heuristic firings point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://gancza-yacht.pl/userfiles/file/56194412871.pdf In PDF document text
    • http://kompletucetnictvi.cz/files/file/38973437206.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613c76c84a348---61227587496.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/josivu.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/84556798030.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/mujijeb.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/22965941582.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/73395439246.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/9953273344.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/gumusijus.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1614af816016e0---94784682582.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/14e068b4157887a6baefdbf6f2dd8901/27116106383.pdfIn PDF document text
    • https://brakos.it/file/wixutus.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/rakewodatitomofiwipij.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/67426335041.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/xusomojiruviragewikag.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/gimaz.pdfIn PDF document text
    • http://charontrade.hu/data/file/vejuxakokaladikijo.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/dasuzekanugu.pdfIn PDF document text
    • http://ipceurope.com/assets/file/29611874314.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/kilokigisubejaza.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/mudapaki.pdfIn PDF document text
    • http://poiskvod.ru/images/file/65376263879.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/18571221569.pdfIn PDF document text
    • http://vibratingsieve.com/d/files/wusadefuzanivubadenugofup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=watch+reality+high+online+freePDF 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_off0000b128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB128 16104 bytes
SHA-256: 79e577ff02bbea72f8d023ece7908c803bd80f644006a93175a6803157dfd1ce
font_01_sfnt_off0000d9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E8 10556 bytes
SHA-256: 418e5b3b4314004f2e1da7a33d39725919bb897e8ff635a1ec96eba93e75741b
font_02_sfnt_off0000f1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1