Malicious PDF — malware analysis report

Static analysis result for SHA-256 9954bfcca69ea73f…

MALICIOUS

PDF

80.1 KB Created: 2021-10-08 16:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: ea9e27623c09559674e68aa432fafcad SHA-1: 075ea7a49d60dd09cc6dade0d0a452657c0b48df SHA-256: 9954bfcca69ea73f1c7c55653308d17c412f6b07d37bea1c95a4b6b85b1018e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The embedded URLs and the PDF link farm heuristic suggest the primary goal is to redirect users to potentially harmful websites. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://vongtaytramhuong.vn/upload/files/pokusela.pdf In PDF document text
    • http://aranysolyomfeszke.hu/editor_up/41671680545.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/81389766786.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/29863047005.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210926032358.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/93044376500.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/79546406169.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/newul.pdfIn PDF document text
    • http://zae.me/datafiles/file/46786290729.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/32794004334.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/tezagakamivirigelon.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/losonelun.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/79308913167.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/jukinapexini.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/tifigo.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109101051576090.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/midugixerada.pdfIn PDF document text
    • http://thongthien.vn/upload/files/40654145954.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/zujaxusuva.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/65446389576.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/sazir.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/10554309738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=whirlpool+gold+ultimate+care+2+dryer+manualPDF 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_off0000d173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD173 11120 bytes
SHA-256: 39a07060443526259c5ce4a5c54d16606940a781cc4b70c25849a4766dd7ce7e
font_01_sfnt_off0000eb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB12 18496 bytes
SHA-256: bc68d2ba1c4698fba977e8a85e4fc04d69dc5a77f650bc6cf68025f2f3531208
font_02_sfnt_off00011af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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