Malicious PDF — malware analysis report

Static analysis result for SHA-256 a009e0245497db19…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 09:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bedff0ce9f15f4b9386a6d076aeb7f6f SHA-1: 4903c58f2b83a8663db0ddac6ed8b31adf7afd8b SHA-256: a009e0245497db19f056b72772dd6a2590405bb0185b1b00586787577625b99f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://congnghiepxd204.vn/upload/files/37652554136.pdf In PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/jumosikilizebevumojed.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/rukikoxidasuwefoz.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/kafejokezigobenus.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/zilomagikakuzibupib.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/wilomezebevidafo.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/78246337803.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/gojobovipozemajavawawux.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/raxevavilusobuwesaloma.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/30327476533.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/90284583858.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/12654862436.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/82838202334.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/pirewamuxiwaz.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/ebb507d3a37f9cd8c93d52b9e2760fb5/62891425541.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/29341348127.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/59147889927.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/4912633976.pdfIn PDF document text
    • http://zenithmetals.com/files/42304280412.pdfIn PDF document text
    • http://gnox.vn/upload/files/fuzeposokediravile.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/pinimamewovugikusolib.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/60466472628.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/88690402405.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/12105017898.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/17294923264.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613269d55d63e---24866414858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+sync+outlook+on+phone+and+computerPDF 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_off0000d696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD696 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 11072 bytes
SHA-256: 7401ee7c7fefbd626e612cc49a3a00afb1262212dee42ff00e1495db4ba01432
font_02_sfnt_off00010853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10853 18320 bytes
SHA-256: b21dfe03c1ef6ba3eb3abe45555b7ccf3417d3da78387b1ef7acfa43929e0b38