Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd630b966e13d9f4…

MALICIOUS

PDF

86.2 KB Created: 2021-09-17 17:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d13f32e2860ea43e75e5fb9652f2b07b SHA-1: 023ccc703a61b34d78544fc1019bf73c2bd4d648 SHA-256: cd630b966e13d9f411c3591d77e8f72a1aae9b141cfcc3c459165388a35047c1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://chataphan.com/file_media/file_image/file/89989437254.pdf In PDF document text
    • http://albarossa.jp/js/upload/files/24061902041.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/66075717567.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/bugixo.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/mufuminefedukomifuvepar.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/vopasejitulejo.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/lumebarizatetopetenujimek.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/96610831888.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/sejibodogujulabolemajogaf.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/26956835238.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/repelalokiruxutikatanij.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/wikinekujudojimudeterome.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/13210113214.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/94958907211.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/nevinolax.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/17863041448.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/lifudogarexa.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/fepurawaxa.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/74432054942.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/47856437329.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/60798631182.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/95721098615.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=free+fire+hack+mod+apkPDF 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_off0000ecff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFF 17808 bytes
SHA-256: cea256f0a86be628de74731cfae771be3668af4f89c37b0230ef701f963f239d
font_01_sfnt_off00011b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13355 10536 bytes
SHA-256: 3b99b15a7c323d0be4ff462bf47d33fe5d2276bf89898df7d4fbf1b6c0036718

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