Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad736a2cbb4a778…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 05:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fc999173e311db9c91877f1106c83120 SHA-1: 73c9d7655fed060b8cf00298b54268ce0842c86a SHA-256: 7ad736a2cbb4a77825085d82a6484e47fb6b92dd458f64ff841f90377fb1a1ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting it functions as a link farm or phishing lure. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports its role in directing users to external, likely compromised, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=android+screen+rotation+not+working PDF link annotation
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161416dbba9194---35854923475.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/43191325572.pdfIn PDF document text
    • http://yztools.com/images/upload/File/nerirovixuxo.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/senamigagegopefijewetaboz.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/guwokuxadavovusik.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/fowerimawebewolajirekabol.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/4430874361.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/paxuposedizegukepopo.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/2659501257.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/31736185108.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/nivadeloji.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109101851524093.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/35054914666.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/zogedi.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/74716062861.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/12872968214.pdfIn PDF document text
    • http://yejida.com/userfiles/file/76565695268.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/ninilibuwutubumisotetepet.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/55132662825.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/67817196775.pdfIn PDF document text
    • https://5udua.com/contents/files/55443292500.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/68874679528.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/76579090425.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/16375561273.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/kadok.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_off0000d3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E0 10660 bytes
SHA-256: 7eb5ea448aca992d430b046c6e89047b3d007f9705b96959b9b3186e7bafff60
font_01_sfnt_off0000ec54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC54 17800 bytes
SHA-256: 0cba3a1c12587cc261053d1624168999534888235104461804e8ec5991866d25
font_02_sfnt_off00011af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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