Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4bd7aad5d34d1ad…

MALICIOUS

PDF

92.1 KB Created: 2021-09-19 06:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: acd5774de606238540a854a87b7ca513 SHA-1: dadfcdb5d964f03a30326ac3dbf5416e1c7ad343 SHA-256: b4bd7aad5d34d1ad1c7d89f06ba599760ffe2b631cb83bb947e205c1f0c13e46
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 heuristic firings indicate the presence of external URIs and a link farm, suggesting the PDF is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://osiindia.org/ckfinder/userfiles/files/ketewojurumokutepakixu.pdf In PDF document text
    • http://3sdent.com/upload/files/21143728471.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/dukekoruz.pdfIn PDF document text
    • https://polandpools.com/contents/files/fipeworizikutijanixoxada.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/tiduzi.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/96968607590.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/jalanojafanamagomako.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/28568293603.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/gobukeselulofolupolo.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/mojebajamagogo.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/xikujuwotawarasuvavita.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/parififelasogusina.pdfIn PDF document text
    • http://koala-al.com/d/files/faged.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/68747171717.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/50bfcb3c8a3a3450e7750cdc8a5b2f08/xebibigosuxexezafunu.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/82887022056.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/judunegemurej.pdfIn PDF document text
    • http://nessium.net/userfiles/file/netazixe.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/41269384998.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109100902259627.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/1216781992.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/surumuweranuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=samsung+galaxy+mobiles+price+in+chennaiPDF link annotation
    • https://easyown.ddproperty.com/datas/files/81822662109.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_off0000feab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAB 11256 bytes
SHA-256: 6e79da5b2a6723438d4fe00f8339ba934757b48409e5d30977c60ea3ccd47adc
font_01_sfnt_off000118a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B2 18836 bytes
SHA-256: e3ea9ffb2e8203335a4a925d011984c8c635dd55f9e6652b6fe279775a9819bf

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