Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9d465e1c2362c5…

MALICIOUS

PDF

76.7 KB Created: 2021-09-29 10:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4c8f8622e65674f57523fb1937c0c20d SHA-1: 4ed7f5b010dd5eb9df6a41a486c1a113e93aef27 SHA-256: bd9d465e1c2362c5c4071d1e759d5b7b928b44b4a00fb7b71c9cba57fb585d5a
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 within documents. The presence of numerous external URIs, many pointing to disposable domains and forming a link farm, suggests a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or lead the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ameshamagazine.com/js/upload/files/50830023967.pdf In PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/39a3583c82711e71c94d61e25b885cd7/79506376205.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/tozizipefovumipupub.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/41807487000.pdfIn PDF document text
    • https://podimercrm.com/img/files/dunajonudamanegazi.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/27629831298.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/nojoratekimudojixagularaw.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f1bcaa43db---xadejovamesirexemakixuwiw.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/mepif.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/xemapotolipoxuzerorij.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/turitotokazesuxojipu.pdfIn PDF document text
    • http://lawngo.net/fckfiles/gomajuwitekivomifuw.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/47107123264.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/64177851402.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/6303078341.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/gugodufamulelugero.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/51327172235.pdfIn PDF document text
    • http://inica.org/files/file///80032253351.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/dudixen.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/56493760817.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/jewukudetoledimaxig.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/23034628658.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/geniwozeler.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///84453019531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=juegos+para+android+no+pesadosPDF 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_off0000c1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C7 10516 bytes
SHA-256: f66360eac205f23603352f60e73af71adf35fb61158488413b2823298b0ad3c8
font_01_sfnt_off0000d99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AE 19624 bytes
SHA-256: 1666a4443cfdf198781c36d23759a380b8b330085ba67913b6f5997af1b88060