Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8a4321fb43814b…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 17:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fadd39bfff0883e705aed7640a0fa160 SHA-1: 48047093a00373448f903db1d27b730babaa1b6a SHA-256: de8a4321fb43814b7dda49a6ecd6a36b3faca3306c5f7e82ea64d3b7e446f1f9
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 numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

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 http://babywagen24.de/userfiles/file/68505831319.pdf In PDF document text
    • http://highgaincomposites.com/img/file/20219917626.pdfIn PDF document text
    • https://greenways.at/userfiles/file/78515942503.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/41818424267.pdfIn PDF document text
    • http://xmst.com.vn/app/webroot/uploads/files/8879730393.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/6023737859.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/pafisisizu.pdfIn PDF document text
    • http://lachina.cn/upload/file/93391847854.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/58574569909.pdfIn PDF document text
    • http://52963566.com/upload/file/202109082332566604.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/26427201682.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/39003397928.pdfIn PDF document text
    • https://bagstyle.uz/images/file/75933915185.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/nusojivilufoxobupika.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613387a8bdaaa---69930955888.pdfIn PDF document text
    • http://erfansari.ir/ckeditor/files/files/33004903963.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/xavisumin.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/95129344275.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/12547361033.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/70726180395.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/7314f3df7e8b884846f34fd25c164eb5/55082581292.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210902052116.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/niwevijekof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=tomb+raider+2+psx+romPDF 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_off0000db4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4F 10628 bytes
SHA-256: 3a8514ed6f5289e2ff7310488afb65ae6aa3d15f226d7908cfff29a10e098952
font_01_sfnt_off0000f36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36A 19664 bytes
SHA-256: a0d6958b5f379475cd735d5c013366d7d15bb2d5938926c4692f888c1ab515b1
font_02_sfnt_off00012617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12617 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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