Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca72dff31c9d09dd…

MALICIOUS

PDF

69.1 KB Created: 2021-09-28 01:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ad2b2b9c1e3468a4be5ae321ba5722c8 SHA-1: d1078cd62d2e2d02ce65cc71ea1f701a52234da2 SHA-256: ca72dff31c9d09ddfe3f621541468a6354e26ee61015adeb9ce5d31abeff63fb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://gemwishrs.com/ckfinder/stones/files/boxuboremewevi.pdf In PDF document text
    • http://emeraldcovepartners.com/_data/images/file/zasup.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/90350890627.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/45396787929.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/63891686754.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/napuxemozulikogirala.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b4ea095f5---bofumepobexegulazulozi.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/91344854247.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/xodotidilopowivexadupule.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/72788850995.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/lofurijolidamimusakojaniw.pdfIn PDF document text
    • http://bresky.cz/res/file/43844537078.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/93154886996.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/xiveroditexoxatuxaxiwiko.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13442282992.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/26300760378.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/11669020267.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/saveno.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/36479771739.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/30328142923.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/78158928156.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/sumejugarilajepulefefes.pdfIn PDF document text
    • http://greenld.com/userfiles/voxuluminirurorerilovosum.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/vomugugutagojofa.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/13727163617.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/xigasuwikizekot.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/17399310106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=blogs+for+salePDF 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_off0000b254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB254 14968 bytes
SHA-256: 14b55bef393d33ae5346db8dc437212945bc8f2c2c45c70894f14730b64d64f7
font_01_sfnt_off0000d84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84C 10148 bytes
SHA-256: e57feb89500b9897b36045f8e5d41f9a5bf9b16bd60f923f110f2ca0ea9c8130
font_02_sfnt_off0000ef2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1