Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab1b56963886a43…

MALICIOUS

PDF

72.9 KB Created: 2021-10-02 10:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a2ea63f8a39c25e1427cac54995be83d SHA-1: 92ee5546694e67b7257f3a625fa2fd0fc8595d8e SHA-256: aab1b56963886a439f8392a66797cda7b4f4ef5929766e481f17d0f36abd3310
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs, which are often used for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ryyw.com/upload/files/2021/09/202109191045454275.pdf In PDF document text
    • http://softtox.com/new/userfiles/file/2289448476.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/26659528302.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/nafesupaka.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/44026016385.pdfIn PDF document text
    • http://salespate.com/userfiles/file/22081172284.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///keximegetopoz.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091001372419.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/33923014162.pdfIn PDF document text
    • https://yakin-surewin.com/media/file/45595594858.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138b4889a8e9---59721300145.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/94685016306.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/87307043062.pdfIn PDF document text
    • https://uangraja.com/contents/files/wopaxiwawabana.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/xenelosonor.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091403352137.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210926153611_1597035981.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/47c85f53418e484bbb1fbf5bd577c27a/tawesoxu.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/44719149223.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210907064406_d4g0et.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/23521643146.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/11201853343.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/57039081561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=can+you+put+hydrogen+peroxide+on+a+cold+sorePDF 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_off0000b152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB152 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC969 11140 bytes
SHA-256: 313152f422ee4a7fdcf1cc841fbe35bbaff8f5c25e452744e5724efd9d3e09fa
font_02_sfnt_off0000e33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33D 18780 bytes
SHA-256: 386aafeffb6f810145f00c58421fb7f9ddbf9a27f6f04de84a4210c6b0d7e53f

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