Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfbfcc15e2b304ff…

MALICIOUS

PDF

68.3 KB Created: 2021-09-25 19:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 804f330eef519441501be1588ff696f0 SHA-1: 2a725f5df149e5ee866814129fd62a0ecb79eb50 SHA-256: cfbfcc15e2b304ff67f4161fea891c0a61a29933e1b716bc6818db92b130288a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it acts as a lure to a link farm, which in turn hosts numerous other PDFs, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/vuwajekatefal.pdf In PDF document text
    • https://paysecure.ro/ckfinder/userfiles/files/52132584056.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/77422727937.pdfIn PDF document text
    • http://kotolantopeni.cz/file/6545171645.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/55dsj9u3ddelb4de5fau69em83/sakomexileropur.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/wakalelu.pdfIn PDF document text
    • http://enewind.com/pliki/file/80731712040.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/93326326262.pdfIn PDF document text
    • http://riviera.az/userfiles/file/zijezozurepuzital.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/64692774137.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/80131155837.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/85444786688.pdfIn PDF document text
    • https://ayurmitra.com/files/file/kefenideliketugukefewofe.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/kiwekejowixolokukodixibat.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/86215801415.pdfIn PDF document text
    • http://zamgph.com/uploads/file/071835106462.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/12866819951.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/tukadezimunetesetiw.pdfIn PDF document text
    • http://ibb-online.ru/f/file/vebejaxeku.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/xorugebawotal.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/7023636051.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/molufizitu.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///roful.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=chinese+pdf+lessonsPDF 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_off0000ad6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD6C 15580 bytes
SHA-256: 624ac28cc46f383d96f763368a6b20b560b25d01180ec1359821728dba5ac815
font_01_sfnt_off0000d527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD527 10264 bytes
SHA-256: 8f6ed96dcbaea29539cb0807e973beabc3f4d46a54fc5fdac6e5e21c6ac95e6a
font_02_sfnt_off0000ec1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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