Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b2ed60c045f374…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 21:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a0e93fd9a4a47e506d19b541fb42796a SHA-1: af6bc9da9006f169555d7699b8aab6205e43c82d SHA-256: 58b2ed60c045f374f7e1072dfe34f61c2d01c782867167eaaa66123e1198ecd6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The PDF also functions as a link farm, hosting numerous links to external PDF files, many of which are hosted on disposable domains. This suggests an attempt to obscure the true malicious destination or to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://registermycompany.in/admin/userfiles/file/84841790150.pdf In PDF document text
    • http://a-aqua.fr/ressource/site-image/files/13085344546.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/kibaruxumebutufiwipe.pdfIn PDF document text
    • http://rentaruedas.com/files/others/52864080528.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/nisosi.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/sojavozuziz.pdfIn PDF document text
    • http://panteres.com/files/files/55038684230.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/4170702987.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/gibewawajise.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/i3dvanub9an3qu3fs84flh4pv0/49502971130.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/jovotasu.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/jutebarofebusaxisasaja.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/wozekedagodopefusufu.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/kigodaxesokud.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/burupegiziso.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/vopuxab.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/buxaluzokebonotejave.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/83938696425.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/lazenajuwaf.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/12271175767.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/62711819699.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/tedipefofapetofav.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b29f589ee1---65099237075.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/nilufijavidujujiv.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/26611356777.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/wolulizudovurup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+earn+cod+points+in+modern+warfarePDF 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_off0000d8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FA 10812 bytes
SHA-256: 4aa3858dbed2ef4f8586cc24a8304e99f38b81bfe600dc6b57c04627b6613ef2
font_02_sfnt_off000109e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E5 17160 bytes
SHA-256: 15a094f02be8578c55457f800a143115ce5a6fd91f4627be9402b889dbcfe2e7