Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccc5c5c1c0baff8b…

MALICIOUS

PDF

84.4 KB Created: 2021-09-12 07:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9f3d64dc1524cfe1dbf06658466beea7 SHA-1: 490d99cbe35550799c5438b161cb68c59ecb8bfd SHA-256: ccc5c5c1c0baff8b0510353ea9e2302b36f33e27261e129472e928ad1cbd4e1c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

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 https://laborke.ru/uplcv?utm_term=how+to+restore+icloud+backup+in+android PDF link annotation
    • http://atomleasing.ru/media/File/56875966108.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/43374133869.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/77735249030.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/4015436492.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/pisobifowigawopujufemo.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/dafupubejazovesuwova.pdfIn PDF document text
    • http://asqcert.net/files/files/47638552491.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/92341159623.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210908155103_1418612866.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/jezirusamunaga.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/15512221444.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/22189691739.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5415d452a---pamiginuvo.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/gaguridarajokodufovekumak.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/guvipenavipidinu.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/73799880920.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/28895632411.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210902_234818.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69642223551.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/13761832541.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/xebop.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/gojelitizu.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/92407355255.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_off0000e761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE761 16696 bytes
SHA-256: cf6378737167b363b06b3a74993c0c374e5c0e1c1c335e963672a7b3f65b8185
font_01_sfnt_off000112f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0C 10916 bytes
SHA-256: 57fd5bcc57219b64e8d550b58ff458950aecaf55061e79173f837c99c39115f4

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