Malicious PDF — malware analysis report

Static analysis result for SHA-256 af59ce6fcaf3118b…

MALICIOUS

PDF

78.0 KB Created: 2021-09-14 01:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 350a5501faf75886b3f31d5915f7ad93 SHA-1: 0b40dfa8123a56c1f5bb69c36f4c4f78a6348dc9 SHA-256: af59ce6fcaf3118b5dbfe8ee4c887919e5530c208045cd4a25cb630c7613d80c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=triumph+dragon+d6+qr+code PDF link annotation
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffce840ae8---wiladulajada.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/tasinapixavew.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/14836638878.pdfIn PDF document text
    • http://elsped.hu/files/file/86426842079.pdfIn PDF document text
    • https://spacio.hk/attachment/file/folipulusex.pdfIn PDF document text
    • https://successalpha.team/upload/files/59448817916.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/34355135568.pdfIn PDF document text
    • http://wirheiraten.de/images/file/vazufaj.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dufig.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/77006594296.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/vezogajomukigesozotedila.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/6629894677.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/wikikezapojisa.pdfIn PDF document text
    • http://kmsenior.org/file/files/jarogiwekigaze.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/fovij.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/gobujozufad.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/5483621209.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/kilulitogasa.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/58553047408.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/najunetitu.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/sakizipelatapazotoxir.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_off0000c3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0A 20940 bytes
SHA-256: 628cf025abc8ce273484a165b438b35e5ab99b118179082f97c68fda4c4a09c9
font_02_sfnt_off000111d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D7 11028 bytes
SHA-256: e8aeb12c4b87c77a2646ea2db5a16a64bc064ee0a5b2edc3b3274a3a3e74073b

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