Malicious PDF — malware analysis report

Static analysis result for SHA-256 b35175e922bdef93…

MALICIOUS

PDF

80.0 KB Created: 2021-09-10 05:38:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ab80d700078b77b832653c5d1a7f72fb SHA-1: f3bde31498058bfe9835d8a7a06f23c7863c1341 SHA-256: b35175e922bdef93b909e888dc24b56943305e3333f28f387c25b4796c2868f8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=xiaomi+mi+a2+lite+firmware PDF link annotation
    • http://cartonwrappingmachine.com/userfiles/file/gameresabefovawolizovig.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/jemokabegavonivumabom.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/45916548792.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/2926822601.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/41743622832.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/2cd9602e9e2724d8ba4cfc91449ef350/makonag.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138506ac3cca---josemijiwe.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/47797810125.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/fudizedifoxutezamixegoxij.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/65572926393.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/64678042092.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/difiwupapokujonolilewa.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/xawerin.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/kofonomibezugalelujal.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/97829762719.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210907123003.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/vapewetotenafipodifelamer.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/towafupezivamubavipe.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/juvenekugika.pdfIn PDF document text
    • http://expresskaliski.info/file/17714078003.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/42930547171.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/63508968554.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_off0000d496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD496 10316 bytes
SHA-256: 5ae80ed6f1bcf938ddc351ee206346b48eb9a9b00e47439b1b1ec42b15eae339
font_01_sfnt_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10405 18100 bytes
SHA-256: e25d8826aab7c3851e7a42ff1b4ee5e0999a1fc3d23821432d619f24b40f4482

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