Malicious PDF — malware analysis report

Static analysis result for SHA-256 83216a9a95581ae2…

MALICIOUS

PDF

69.6 KB Created: 2021-09-30 13:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ab10b0f6b809709a2f29671e98b8a54c SHA-1: c471d62be77a21214dca229c33b68b642be0233f SHA-256: 83216a9a95581ae2a0d6f6449ab406780c72746b5dd18b07b178635078ad44d5
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 to external URLs, as suggested by the PDF_URI and EMBEDDED_URL heuristics, 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://www.papelerialapiceros.es/ckfinder/userfiles/files/tepafevejamumije.pdf In PDF document text
    • http://elitvorota.ru/f/file/53555563607.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/1276110851.pdfIn PDF document text
    • http://zgic.ru/!upload/files/21491071643.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/66189207488.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/danin.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/93931048270.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/31942977578.pdfIn PDF document text
    • http://xenangheli.vn/public/files/gesumokixemefejaxivinore.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/97874038476.pdfIn PDF document text
    • https://badoza.net/userfiles/file/59241853332.pdfIn PDF document text
    • http://indemo.pl/Image/files/nujirafux.pdfIn PDF document text
    • http://finchamauto.com/pics/16960727516.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/rosimulutusabevexalof.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/zarolivatiwobemojowogenav.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/56901381428.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b435acddeadbe7e2f9ed39ded76f5106/luzegotunadowap.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/fiwulupajexezulolux.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/65991671080.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/jaxuzabinoz.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/41310030929.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210914163605.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/17735978601.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=tubemate+2018+versionPDF 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_off0000ae23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE23 10992 bytes
SHA-256: f2b6806f55ab141c48865ea3bd9ec9938dcc8080a2ad12149d8dfe65a1feb2b4
font_01_sfnt_off0000c7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C6 16676 bytes
SHA-256: 3930863261a192e6b4373baf992ab6a9d064c92feadf04e7b7dcb6eeb2d1045a
font_02_sfnt_off0000f16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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