Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfc99dbea2c7424…

MALICIOUS

PDF

81.1 KB Created: 2021-09-20 16:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97f1e26caf84e4f736f211ba34139f43 SHA-1: b7950237ef3cf43e8eb162de88784eccb6013437 SHA-256: ecfc99dbea2c7424b1c8a04b2b1c237b134fc01770b40e2eec83e3f148681164
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 heuristic, which are often used for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://recviem.ru/img/upload/25646418696.pdf
    • http://aaykpn.com/uploads/editor/files/wowajavagoniwofeba.pdf
    • http://coomargroup.com/ckfinder/userfiles/files/munijivoxokesuluri.pdf
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/lewetizatamiminewe.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/e9eb3a4b98542bad4de7c9141fd57033/kinewuka.pdf
    • http://china-zub.ru/userfiles/file/mapatixezavejijipujoj.pdf
    • http://laiyi-art.com/userfiles/file/kuwijikubetiduwejizibo.pdf
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/takivezuluzagekep.pdf
    • https://almuhja.net/ckfinder/userfiles/files/zawakuno.pdf
    • https://www.wemservice.com/ckfinder/userfiles/files/44390832967.pdf
    • http://lasfyy.com/uploadfile/file/20210903093415635.pdf
    • http://herbwaterthailand.com/userfiles/files/2655822024.pdf
    • https://rlmahtani.com/userfiles/files/23569391165.pdf
    • http://metamorfoza-krosno.pl/userfiles/file/kavipomeje.pdf
    • http://shijijiaming.net/filespath/files/20210906035121.pdf
    • http://casavacanzesanvito.eu/userfiles/files/61131868392.pdf
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/82973208808.pdf
    • https://thepainter.asia/upload/files/subamubimekebufisoti.pdf
    • http://watchimport.eu/userfiles/file/fejuva.pdf
    • http://noospc.ru/SITE/files/editor/file/99596962050.pdf
    • http://obkladlazby.cz/userfiles/file/26443624821.pdf
    • http://gesundheit-im-blog.de/userfiles/file/71030993329.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=furious+9+watch+online+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d675.bin
a55469add063ee1e8f375b65eac853a00e908a3b8a7f3a581ab350e57de99d0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD675 18252 bytes
font_01_sfnt_off00010663.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10663 16792 bytes
font_02_sfnt_off00011e7a.bin
6e8b722b998e4029c917b59c0cbcebbd6312503bf9121a0f377c3edf9a117662		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7A 10764 bytes

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