Malicious PDF — malware analysis report

Static analysis result for SHA-256 846cf70fe00002a3…

MALICIOUS

PDF

81.1 KB Created: 2021-09-20 08:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f90ae2f70e8b92e6a60de1bab21876e2 SHA-1: 86c996695b2683ed1756bfa9a9def084643748f0 SHA-256: 846cf70fe00002a35d9b7ef85119a4cd3bee333b9430d1627c791abd9fc63f98
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV both flagged this PDF as malicious. It contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and the presence of many unknown URLs suggest an attempt to redirect the user to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://jrpst.pl/userfiles/file/rafaxoge.pdf In PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/34318398357.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/sevijanezilapiwaz.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/34435574995.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/momaradixikasad.pdfIn PDF document text
    • http://scsytech.com/upload/files/57935372282.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/vidusitenogukanij.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/b2cc12542d249c1467359b84adb72066/83012157546.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/jiperexoxureserilajafoza.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/bc23766e3745eebc8cc18934aed9b7f8/84271765915.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/vaxena.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/37176137970.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/20876055031.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/wivovo.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/3412386480.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/tixovexusag.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/divaxateri.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/wulaxetawufikejil.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/10878706807.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/42666295551.pdfIn PDF document text
    • http://domexpo.ru/up/file/82035735482.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/78200893023.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/78088551938.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/mejusumarofe.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/49772062524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+bachelor+australia+season+8+123moviesPDF 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_off0000d53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED53 11316 bytes
SHA-256: 5418c70cfe9a2b55f56bedc21f9e2c7a1b320853300b9353db00a3d92865e4c4
font_02_sfnt_off000107e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E3 18088 bytes
SHA-256: 904f066e33af768fa72510d777a4a9a3520c8992793c2141fa66f2ae1e133da8