Malicious PDF — malware analysis report

Static analysis result for SHA-256 26333eb4fdee0946…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 11:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3e459e834da8a4539fe202beaf6860a7 SHA-1: ac1f4266d305fcf705d7ecf5338e1463011f0f35 SHA-256: 26333eb4fdee09464a1e9ff72c3d01024805e342d3b279f05bce5e4e8f926380
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely directing users to malicious sites. Although no scripts were explicitly extracted, the nature of the PDF and the presence of many external URIs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://watfordfairtrade.org/app/webroot/img/files/93690558333.pdf In PDF document text
    • https://superpart.com/files/78560421180.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/soduliwevivivolesek.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/30882604259.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/67498161761.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/dedukizimujop.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/bedexa.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/sudofuboxut.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/75051049662.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/e56df92572b9c2740aa2e9d3d98e68bf/70561825880.pdfIn PDF document text
    • https://svltv.in/userfiles/files/pevitodufiwajutidunat.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/11186004086.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/wenalisis.pdfIn PDF document text
    • https://tsolisp.com/files/file/32795086798.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/85091899103.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/suwojewoguzomire.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/vofubazuloxasuvaliruroke.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/690058296.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1614013ed16903---8777157070.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/49160685273.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/95337420456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=my+android+battery+is+draining+fastPDF 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_off0000d833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD833 10732 bytes
SHA-256: 018039cd2cb8e58d12a635d80943602b7b9584a0f4e5c9801ee1d684a1b6e9d0
font_01_sfnt_off0000f0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CA 17312 bytes
SHA-256: 264b3006cee063b0d0d531e507bd131af115c219dd3e218eaf47d28098d6a43b
font_02_sfnt_off00011d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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