Malicious PDF — malware analysis report

Static analysis result for SHA-256 2371db55da408cd8…

MALICIOUS

PDF

79.7 KB Created: 2021-10-06 06:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 910d752b57d0d2a80df3b46f0b91fb22 SHA-1: dbdfd8412fc80e9ebcb2449e6acab0c5bfec31e0 SHA-256: 2371db55da408cd881f95ad7d25a900d6c850dbae6d8907fca8f3b1d0c291ef1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to phishing sites or download further malware. No scripts were extracted, but the PDF structure and embedded links are sufficient evidence for the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://huntic.ru/uplcv?utm_term=removing+remote+management+from+ipad PDF link annotation
    • http://www.socfertenviron.org/cmsfile/contentfiles/gepusasikoriv.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109230122295229.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/zutukumixarobawonobuwo.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/lefijogi.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/gekojolisalogubiroge.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/zesulajubilav.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/46956575992.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/40938996864.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/42532231437.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/19881677397.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/xiretavigezeloro.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/88862362845.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/voxuzalidab.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/22073054642.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/ketoveduluwelemi.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/91144514890.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/33917782909.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/16123735337.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/63508180837.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/pipelujarifi.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca82f8915d---kafisubugofowabamugoduv.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/83029041563.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_off0000d2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C0 17572 bytes
SHA-256: a009d2d721d9e40d4dbd4659c6c22dfdfebdb97e357012b71df7ec2dec868c0c
font_01_sfnt_off00010014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10014 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001182b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182B 10740 bytes
SHA-256: 598c81094308760c9b49490f8d929bc4837288ba189499c4ad75cff36d537700

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