Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4293b75e3d52a19…

MALICIOUS

PDF

70.7 KB Created: 2021-10-01 02:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5e2380bbe6236d6c5cf2fe8d9f44a17c SHA-1: d96649b0ae24972c172fa4566ab81a78c13bb4ae SHA-256: e4293b75e3d52a19054e1d75f8d31ec1f132e9f7b22ec2fb1d3ae289c1739070
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to PDF files hosted on disposable domains, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://cafemocion.com/userfiles/file/nedefatuxenexalufidazi.pdf In PDF document text
    • http://hoteldanang.com/uploads/images/files/83750131512.pdfIn PDF document text
    • http://grupophi.es/uploads/files/95374412737.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/xivedipewoku.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/36326507310.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/weretapegalutoxasarapepe.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/kubufifokuledabizo.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/dowivibufuvik.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/77533892126.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/sufabema.pdfIn PDF document text
    • https://linker.tw/files/10782529415.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/jofitokek.pdfIn PDF document text
    • http://kotrackusa.com/fckedit_file/file///20210912_13_25_37.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/mazimoxugomarax.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/63350574840.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/befenapenogesadozuxomabin.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/dororukurexi.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/jodaxodibod.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/sedonegatazixegubuvi.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/154959140.pdfIn PDF document text
    • https://vatlieuchongnong.baohohoanglong.com/userfiles/file/gepemo.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136ee4114a52---vokotuzewakanezuvumosum.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/92688599261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+scan+a+qr+code+on+your+iphonePDF 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_off0000b1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA00 16312 bytes
SHA-256: 5b31e4d1efdf71e246df7a4c5564e602ac16a9a890db7aa5fb1b843795e3f58e
font_02_sfnt_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 11000 bytes
SHA-256: 2758deab46c2123b1b7fdff5ee9504808adb516dde783a73767fcfd27c609f65