Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ce5a1d8a3c19e6e…

MALICIOUS

PDF

68.9 KB Created: 2021-09-27 08:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d7f27f788720d5fec5b55e8cc8b98f05 SHA-1: 245c9433b89f289dd50497d2a373d7adfaf5551b SHA-256: 6ce5a1d8a3c19e6e9c0288201814c9b72e75fb2f2e02636034242d68d7e2c556
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of embedded URIs pointing to various domains, indicating a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://catamma.ru/uplcv?utm_term=shadow+the+hedgehog+with+gun PDF link annotation
    • http://geometracosentino.com/userfiles/files/nepidejukajefezalud.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/namuzanoxakulizaraler.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/105bef35cc8e1fa88688f5ca0a22a5e6/zulixuned.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/34273942760.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/784f6f05b0fe880a7d1b0621ad4bc3dd/94213340475.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/294465066.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/26292112133.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/fadis.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/85459150613.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/93739745122.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46192318649.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/nusijirababojajame.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/82515855471.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/93703702145.pdfIn PDF document text
    • https://ibextrail.com/editor-images/muxidaxorotetid.pdfIn PDF document text
    • http://normel.org/files/upload/file/98487878390.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021092213450724.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/jupad.pdfIn PDF document text
    • http://didopack.com/files/20917258284.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/lexasosof.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/5833088477.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/98028793204.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/wepunalufimezibanepulebeb.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/werura.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/99750821362.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/70097351669.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/temafesaf.pdfIn PDF document text
    • 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_off0000b1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B3 14672 bytes
SHA-256: d4ea84b2a445064f224588c9b7f8a550279990eeff8a0ffdc61f7a8d8964ad8d
font_01_sfnt_off0000d65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65A 10476 bytes
SHA-256: b2e0d944310295622250eec3afe6f5fefaf21ca884f17b4a6e04db25f491d6f5
font_02_sfnt_off0000edfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1