Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc5ee03217da89d…

MALICIOUS

PDF

71.4 KB Created: 2021-09-20 04:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01ab3bfbd20c7e4ced7726b68521d787 SHA-1: b4201235bb5aa6731cedca69a9362ece22924cbd SHA-256: dcc5ee03217da89d117e1d4d587375ff41abb131c79f563efdbea621db33b86a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs to execute code or redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of external links, many on disposable domains, suggesting a link farm designed to host or distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://35ju.21tg.cn/uploadfile/ckeditor/files/52727643265.pdf In PDF document text
    • https://butchercurnow.com/img/shop/contents/rinogexubanav.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-13/20210913234724164397.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/mubutagorisupoxa.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/7121215541.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/58595147061.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6c6781393c7d595aaa0e8f2e50533051/rebipoxozavefururo.pdfIn PDF document text
    • http://theponghop.com/upload/files/38943769120.pdfIn PDF document text
    • https://baglab.pl/galeria/file/zigixiro.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/24779348496.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/xegebixiwikasapezew.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/fewibuxevozebuva.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/bikuwigosakis.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/vuloxipudizajosamosigaj.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/dozuxoguvivevu.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/e0e26199e54607576d811e595d160775/19180372863.pdfIn PDF document text
    • https://reha.bg/content/upload/file/30538447947.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/96936068802.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/welikitavexixizu.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/39167848077.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/nuzawuzodukavirudilo.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/davaximimebepid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=excel+2019+pdfPDF 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_off0000b8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8BC 15888 bytes
SHA-256: 6ce203c0346263c6b8ac7a16384d1215bed881d6b7dcd5855f6736057ab80e07
font_01_sfnt_off0000e125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE125 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93C 10316 bytes
SHA-256: d9f4521fe314011bf7d452a490cddc39265157fa265fabbb50fb512f4bd9f493

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