Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24065a6dac424ba…

MALICIOUS

PDF

79.6 KB Created: 2021-09-09 11:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6297e0c6d743b0e7ad9b50bbd3a304f8 SHA-1: 47345a99f68e49fb158f5f80889ca77cc36341bf SHA-256: f24065a6dac424ba2df6752b7861f23042244d61bda376c781b1212e597a5c93
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also acts as a link farm, directing users to numerous external URLs hosted on disposable domains. This behavior, combined with ClamAV detection and ML classification, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=best+messaging+app+for+android+tablet PDF link annotation
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/811c4956260b376245d46a5aa72b054b/nojol.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/35548809771.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/13601346934.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/muxomupiminajuguvel.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/39239186177.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/zupotifasaburojodobenonus.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/51207341001.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/316819526.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34283631425.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/vegojitulevojesetugib.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/67822036874.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/sejiwukorefudaxubabi.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/funizidatelelajafija.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139a3ecad5a3---kakosiwumisopelap.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/61688240030.pdfIn PDF document text
    • https://ms01bet.com/contents/files/dububex.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/zolukagovesodirogu.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/jitatesisunirepawudunufel.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/zatalebafape.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/gimekewufol.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/38525695967.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/rujatawewuxibamaneli.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/pipos.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/ramiralikabowaxe.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/zekitupudid.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_off0000d3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F4 16800 bytes
SHA-256: f1ca46c8c62ee7885c9c5eb69810a749988010cd703e658e21239004ba5c1fbf
font_01_sfnt_off0000ff66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001177d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177D 11036 bytes
SHA-256: ab7416abbf9151af0325474a27804c9a159cdef816e6d2630fe9dc02a079963c