Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d97cc557585abd2…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 02:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1123c6b87d724c6246c8bca1ec84817a SHA-1: a97451aa83a5410bb9571129b4b92e7e0a673e62 SHA-256: 8d97cc557585abd2444e4cb39a65b397397a7311db37c3bc6888aa0294f349cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to suspicious PDF files hosted on various domains, suggesting a link farm designed to redirect users. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score indicate a malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure strongly suggest an attempt to exploit users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://libertyrealestate.in/ckfinder/userfiles/files/bovibowebojopeki.pdf In PDF document text
    • http://linhkienhunganh.vn/luutru/files/makaresugerabokogunede.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/8021511929.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613fef0daa0fa---12892342465.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/36543526947.pdfIn PDF document text
    • https://istanajp.com/contents/files/wazunap.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/71435433934.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/25132498205.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/kituxudusunibaduxovivu.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/xolivagukivowujizi.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/46042056824.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/78656205529.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/87129662148.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16136d7716c29e---81331604422.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/24819156830.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/60985346856.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/44674225317.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/kesumavodapujis.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/16723261251.pdfIn PDF document text
    • http://furniture83.com/upload/files/waxedoxejixexenisop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=marshmallow+apk+downloadPDF 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_off0000d822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD822 10504 bytes
SHA-256: 3ff5b7599564be3e0fb92fdb16089140dfe66e26398b7ee6013ad4688315f106
font_01_sfnt_off0000efe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F2 18516 bytes
SHA-256: f2ebaf016c58fe23741f42e96443fe49dd8a628fffacc730f90453283691f5c4

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