Malicious PDF — malware analysis report

Static analysis result for SHA-256 04236427eed1d5a3…

MALICIOUS

PDF

73.6 KB Created: 2021-09-27 11:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c3dcd0d1f398ba72eb03afae381065e9 SHA-1: 048a6fa01a36c09e292954ed4ae1a66affeb1464 SHA-256: 04236427eed1d5a327dda61361d30efc57740d925c80f310cfb273d77d81e203
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to disposable hosting, suggesting an attempt to obscure the ultimate destination or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pindimana.in/uploads/file/77549592618.pdf In PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/bixujojebizeximine.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613dafcf43009---27851853770.pdfIn PDF document text
    • http://favorit.pl/userfiles/file/tekavuvezububowitikemabek.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/vivoxuxabodubej.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/nefuzolifivepubinowafij.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/fobuxenek.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/58374263794.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/gevigu.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/zezuvejemodiwopavuk.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/lurugigekege.pdfIn PDF document text
    • http://edituj.cz/res/file/bapibadaw.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/rofarakekusokoseranaf.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/3d3a4fff4d86f910b93518f074ad7a78/zanijevugogezid.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/kiduzurukelixeziligiref.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/65114215146.pdfIn PDF document text
    • http://briztravel.com/upload/files/reramax.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/pidabagigef.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/66251354660.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/netinilisawubogesokewaxup.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210906203112.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/80764871329.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/napisoxukumofobuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=best+phone+for+custom+romPDF 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_off0000b7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A3 10596 bytes
SHA-256: c082ba5f0c9cef44d9742d45a48a6817de04556dde29a4291bbab0ac7b618f71
font_01_sfnt_off0000cfb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB6 18828 bytes
SHA-256: 01fda539bb6ff30011e257216f6cabaa470840f4dae4928eca6c7a0b1bec64c5
font_02_sfnt_off000100dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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