Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4eaa99256b8400…

MALICIOUS

PDF

73.0 KB Created: 2021-09-24 22:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b56270bcf6268c2ed4fa2681b3afbfea SHA-1: 505ba487b7e9d78d73bd31026fcf954a1d104452 SHA-256: ec4eaa99256b8400974c183fdbb880c47093b7a06c66cfe267ac0131f3e37f39
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, with a critical heuristic firing for PDF_JS indicating embedded JavaScript. This JavaScript is likely used to redirect the user to external URLs, as suggested by the numerous embedded URIs, many of which point to potentially malicious domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://kp-bs.ru/upload/files/69440498712.pdf In PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/93500543119.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/48294925148.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/dabukabapuzu.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133f2477fc22---senodusetekemarop.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/wogikif.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/fexonip.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/zixekumebufepagarimuzi.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/89078759512.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16146608c6c930---lalejeladujuva.pdfIn PDF document text
    • http://nemalipics.com/kanugitokelex.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/88226107561.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/sigebunatonuriniganikige.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/jebinixu.pdfIn PDF document text
    • http://chamdure.com/DATA/files/kexixexosarudab.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/foveletozivuf.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/45294312112.pdfIn PDF document text
    • https://hgb.se/filer/file/vixuras.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/xaxupixeg.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/58257578623.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/71027070816.pdfIn PDF document text
    • http://destock-groupe.com/userfiles/file/35909943672.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/s0tmiricl0dpghgc4a8h7gecgm/41491047125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+split+apk+installerPDF 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_off0000b745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB745 18532 bytes
SHA-256: fe45f8f378e45bfe5ce1e0ff08e7c010e3d408da14aab944028e3767068df1c9
font_01_sfnt_off0000e6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FC 10316 bytes
SHA-256: 9bd337f0edfe550f9d5dacdc57c2f5333af8ddd88e8638bbfe1897aca32b0d2a
font_02_sfnt_off0000fe31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.