Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21b126bced3c4a2…

MALICIOUS

PDF

82.5 KB Created: 2021-09-24 18:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8988a2f8d4201a2d7942270523f3a63b SHA-1: adf04878cdcfb78651afbcb7e2e4d67e4f507dc3 SHA-256: c21b126bced3c4a2a3e09b62c2f1c315bc8b7e06085d9976f83d30be964bfcd0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://aimtronu.org/userfiles/file/bokemoto.pdf In PDF document text
    • http://midel.me/userfiles/file/niperelitipatumumisa.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/botisenebigufasuv.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/23595256240.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/7500083613.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/juwipogejo.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/dewojajugutazovefasuwa.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/rebojotuz.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/36086270294.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/jenetajubeza.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/40278052366.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/dokelaposaj.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/tevixoma.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/wimebofib.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161321447d2c01---58792263673.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/xofusijisusefufuwan.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/pasaleguzujonolu.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210918073554.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/tebufolupisarofoxapudapo.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/73939951474.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/putazoketajof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=pokemon+delta+emerald+gba+cheatsPDF 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_off0000d2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC0 21260 bytes
SHA-256: 06058e4c58b95c5e5c7945275b5c1f244c99584284973458d27a0487bae895a6
font_02_sfnt_off00012215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12215 10960 bytes
SHA-256: 12d8c3b13640d60309758c90df39fd50cfe20fc509a4a72a370c8b2e87cb6631

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