Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8fe0d5458caf7e…

MALICIOUS

PDF

100.4 KB Created: 2021-09-17 18:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6756eaed005c00ebe32ff587d48794e3 SHA-1: 399b4d93d2db573350a99a2a14eb4674ecb32e10 SHA-256: fb8fe0d5458caf7eca4f6f8815f62448b01a257bc4f9237c7d7c3aa4bdfb97e3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous links to disposable domains, suggesting a phishing or malware distribution scheme. The embedded URLs, despite some being marked as benign, contribute to the overall suspicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c381221d69---41218639441.pdf In PDF document text
    • http://jfhconsultancy.nl/userfiles/files/kejapivatixunazavevowovas.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/21538445426.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/62525799261.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/69851952236.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/semepapedozomegatabo.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/56464514131.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/mateje.pdfIn PDF document text
    • https://securitydm.com/slicice/file/31543471013.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/xelurolisixamofebur.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/525417627.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/24577844828.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/92577558711.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/jileteluxoxegoruwu.pdfIn PDF document text
    • https://miet.hu/kepek/texivojuxodapefi.pdfIn PDF document text
    • https://vontobel.shopbyeberli.ch/userfiles/files/fuguxojepinigijimul.pdfIn PDF document text
    • http://taxfreepoint.com/file/lefesatabejujib.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/vuvedobasimot.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/duxepinefuxek.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/worijiduvekevezowavadu.pdfIn PDF document text
    • https://atlantidegattico.it/file/bojekunarajefajuno.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fbc322a72---19701882637.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/77955389580.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/28768473573.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/46773619419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+hate+u+give+full+movie+123PDF 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_off00012345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12345 10764 bytes
SHA-256: 9cd81b4c50c85507ae76741801bc1094a3db38e7dab1caf409bc9b0c22ac1fe9
font_01_sfnt_off00013c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2D 18244 bytes
SHA-256: f5106332469e79b7d15e1294d2ce6226720f60c44ad8b415b9cd5a56fc4bbfc0
font_02_sfnt_off00016c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1