Malicious PDF — malware analysis report

Static analysis result for SHA-256 f409cc623d18b2d2…

MALICIOUS

PDF

93.0 KB Created: 2021-09-18 23:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b214e73b4f67ea74f57cd1132268c809 SHA-1: 9affe9a435a00102fa563ad8f6b74c05e3abf13e SHA-256: f409cc623d18b2d243cd8a320204a444d2576f5d8a26b633e707acb276e36e88
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of external links pointing to potentially malicious or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving redirection to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://eksternest.be/images/file/73083320880.pdf In PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1631384925_a39f37d4ea.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/47352290614.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///nejezepekali.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/6ag261boch6iub5epr86l5bm34/fupamefozudile.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/wopipifano.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kakadipezukuxu.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/26633235024.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/69549884050.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/20990918982.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/medarezubaxetugor.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/nerezujukasegokisiv.pdfIn PDF document text
    • http://gr-chem.com/upload/files/lirixejigomotamevuguduto.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/15232240933.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/tinob.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/kozawebotemaki.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/pivem.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/66295811202.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/92771970948.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/fulaj.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16140a75ece22b---76819855889.pdfIn PDF document text
    • https://taperagi.com/contents/files/lilavenoguwefil.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/87277407152.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/41166862508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=android+analog+clock+widget+second+handPDF 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_off000105ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AE 10808 bytes
SHA-256: 8e72ba574f674211318d29a671e5156c1dfa81ab0522cc8ab6e8377bf835f1f9
font_01_sfnt_off00011e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13683 18392 bytes
SHA-256: 148ce0e46ff0c3f78500878387232257b7ba5f02ab0753475f2d019cc9c465da