Malicious PDF — malware analysis report

Static analysis result for SHA-256 d34cc21fc01a4a01…

MALICIOUS

PDF

69.7 KB Created: 2021-09-19 04:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8ab99c2c54acde0207ea531a9fe49224 SHA-1: 7ae3dc58aaeae1f61f8a5564ef81ba0d1c5c88e0 SHA-256: d34cc21fc01a4a01f58516ca06d4adefe80c5d560183fb598d4c5a3e2e223013
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including a link farm on disposable hosting, suggests a phishing or SEO poisoning attack. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://taxforce.nl/userfiles/files/95556393487.pdf In PDF document text
    • http://someteme.com/archivos/_20210907171848.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/85185086845.pdfIn PDF document text
    • http://strahyi.ru/images/file/96852209679.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/tefub.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/xiwara.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/kabizawuvavenibatifatoj.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/25331232896.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/sofib.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/7072482970.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/dodajebujebedibexaganok.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/lofagomemukomolabopus.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109161549492383.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/wugaxewofamulal.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/lirajax.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/zobabevekedor.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/povefozugukil.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141165316485---16736835625.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/2741641423.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/32141708234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=live+cricket+match+apk+free+downloadPDF 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_off0000b0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AE 10920 bytes
SHA-256: 2dbd89a54a61ec3139e7c85c3b44c662544fdbb54b46e96251b5b904189bb7a5
font_01_sfnt_off0000c9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CE 15600 bytes
SHA-256: 2dfe0928707b8410ed44951e682d3d9699c94da27975b4dca247cbac9042ef06
font_02_sfnt_off0000f1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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