Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a963ed800f0f63a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 22:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 88098b93d0c7a54b78f55f05065c8877 SHA-1: 56163b1dcc0201280e7371d55131530f62f3a788 SHA-256: 1a963ed800f0f63a9a1460244100710f4d97219e1a3eb85e1152adc4b67311ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to potentially malicious content, flagged by heuristics as a link farm on disposable hosting. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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://florerialafloresta.com/ckfinder/userfiles/files/36703167547.pdf In PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/rokisutumitasiwemegaki.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/81229489810.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/76793053955.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/tujikimixosexogoki.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/falekanusutifokivatubagi.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/87015258304.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/pareki.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/22062665573.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e28bb45a03---lerijepivemawawelovidewak.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/sudepegalisusofoxovif.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/94539426840.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/21090909461765639468hiw4.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/58684889711.pdfIn PDF document text
    • http://ave-france.com/pics/files/zekowabafonajusiwomanusul.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/gamodoberofa.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/94068094887.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/fobalitekuxogidodozot.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/nemijo.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/15734744520.pdfIn PDF document text
    • https://nexusmediation.nl/files/wulaxomiwudawufazifinixa.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/m8aqofm5l26t9eustretffqrqo/98223934309.pdfIn PDF document text
    • http://a-pluset.com/userfiles/podaniraverixobuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=ac3+codec+for+mx+playerPDF 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_off0000d8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F2 18092 bytes
SHA-256: 823be97a6a842cc5b85f3fab5af97a8f17b61623b6de2f450bdf0c3f338b4c0c
font_01_sfnt_off000107bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD6 10688 bytes
SHA-256: 2327c52da1a809a56de79357f9d0a8ac59107992374fe4781028d8d26a2456b3