Malicious PDF — malware analysis report

Static analysis result for SHA-256 65425488e1589bcd…

MALICIOUS

PDF

71.2 KB Created: 2021-09-17 14:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 52a08a4d932919be8bae7c555e6c22aa SHA-1: 188e55fbcbbfb5c49bf6d4238c2d4953d91d9479 SHA-256: 65425488e1589bcdecf44ddec32e99fd3bbe5bcc266f867e4bd254bd8ed57402
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=letter+s+fonts+to+copy+and+paste PDF link annotation
    • https://bostoncake888.com/UserFiles/files/49229296468.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/dogazepulekep.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/kibetijowe.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/4369821753.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/72435977231.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/paposi.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7f8859d40---tizazibaponupu.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/nemubimifibixakekaliwet.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/zanenenabenovuvu.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/betositofumamofav.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210912_5F5C4936ECE8ECD4.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/5801de2c08a1f0bd2e9bf438252f03e6/tigaka.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/sibukidukomabiriberumod.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/66786361865.pdfIn PDF document text
    • http://soupworld.de/upload/file/6478638692.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/xagasaferi.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/3929519263.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/8857859072.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/putinebisibiwabokide.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/46981349728.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/zujabixositavebo.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/63103601557.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/48463425501.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/natijumele.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_off0000b42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42D 10544 bytes
SHA-256: 827550eb714572ed5c9d0307df63516dd8bfac8bc05efc7671abd64e40c90e99
font_01_sfnt_off0000cc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC62 16864 bytes
SHA-256: b0a2e1b11f75d018651913746da3685c48e18bd8e0aac842f9966d1e3af13701
font_02_sfnt_off0000f7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1