Malicious PDF — malware analysis report

Static analysis result for SHA-256 19be6f794bb416c0…

MALICIOUS

PDF

70.0 KB Created: 2021-10-03 17:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7073bc53be2c30e72960d0c4c7b522a0 SHA-1: b59fb123e20f0dea304a743c60a0351ffe6af1b2 SHA-256: 19be6f794bb416c0bc3332d4be5f6201b37e4c273eaa2b18716ae85d4ada1513
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to unknown domains and one specifically identified as a link farm on disposable hosting. ClamAV and ML classifiers flagged this PDF as malicious, indicating a phishing or trojan distribution attempt. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://nordicwalkingturak.hu/_user/file/89219762952.pdf In PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/84721169899.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/kuzulukazizur.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/22523988858.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/mipuwepezajotirilomanok.pdfIn PDF document text
    • http://zaiger.ru/img/file/jipev.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/69395882993.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/tejupogafeketerifabo.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/doxafidotubapatadad.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/vuzobakaferusid.pdfIn PDF document text
    • https://lsv-wittlage.de/ckfinder/userfiles/files/14327579591.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/resoso.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/3237099531.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/76620314738.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/32044914954.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///27981350909.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/65893648860.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/vetupapolezevafed.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/natafofojag.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/bojarajipenirod.pdfIn PDF document text
    • https://majubesar.org/contents/files/gagotibazolowawilixekali.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/jojelikifif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=meditation+for+contentmentPDF 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_off0000adc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E0 10416 bytes
SHA-256: e2058a50cea7799351cf0f2934b4167081f58302ecae49d7873cb6d58bd7e523
font_02_sfnt_off0000dd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6D 17868 bytes
SHA-256: 8bfec6d6886939c50a2a9f9ef603343c16b05e2cd8d9381df5dc5e8e38f797cc

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