Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdee84e525e1312d…

MALICIOUS

PDF

73.2 KB Created: 2021-09-12 23:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3bee1b0f7cf9b00d2a440225a496dd1f SHA-1: d08841c1ab1d8114b7f078a4383362ced063a19d SHA-256: fdee84e525e1312d4d8b13f310cc025f27ec519e744fa4e8bf8419fbfaa95363
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, indicating a phishing or trojan payload. The document contains numerous embedded URLs pointing to various PDF files on different domains, suggesting a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this, indicating a tactic to distribute malicious content or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://dpengineers.info/admin/userfiles/file/janofokolinajeluwa.pdf In PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/52787657010.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/goxuvuxarumaroku.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/zigudidepoxa.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/degevisuzoxomogejemazuxe.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/21066228436.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/40926675055.pdfIn PDF document text
    • https://geniodelweb.com/file/ridapo.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/fafebojatejowexodumowawep.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/30285544372.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/43059840831.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/23796502945.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/66393683235.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/waxowevezisogegepemuti.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/resenigelekidad.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/pafogetisifulatejatifi.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/rosuxobatobebipuda.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/58172597698.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/bubinesulabexekisekaf.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/57443727436.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/658744865b12bed33c8d5759c3809fb7/30434354950.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/22045118230.pdfIn PDF document text
    • https://rafautama.com/uploads/file/39229483931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=food+delivery+website+ui+designPDF 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_off0000bdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDFF 10744 bytes
SHA-256: e525deb2056dcf8383cdc8024407219c49d4a28df3d2e19642cdd3729585d70f
font_01_sfnt_off0000d6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBE 16064 bytes
SHA-256: c7aa79f2553d6ef5c697d992e4612ee7ab13368272fa15cbc2479d33b9c576fa