Malicious PDF — malware analysis report

Static analysis result for SHA-256 6710559affcadd71…

MALICIOUS

PDF

84.6 KB Created: 2021-09-10 07:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3dccb1c81d3f1b9a24eb890d3e2e9c72 SHA-1: 2b5165a9b2b9dc9ba52b4a9c5caff2c5b617138c SHA-256: 6710559affcadd712064af93e8b66923e73d94989cf8fc1d1ccd1f916a29b537
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs, many of which point to suspicious domains and are likely used for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pk.mo/userfiles/file/kopalaka.pdf In PDF document text
    • http://riccaassociati.eu/userfiles/files/86442377460.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/9766613345.pdfIn PDF document text
    • http://packturf.fr/files/60713513994.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/tumemape.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021091010485373499.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e38721e0a---10431047871.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abe86144e3---64917119609.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/52260322513.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/27851074091.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/21552293807.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/49511638630.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/81488392871.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/19049252331.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/vodaxuxujowajotov.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/20219672185412.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/55805703680.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/revud.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/tisowojes.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/42659397957.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/sajezebevemefovibileg.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/nimoxibapamikifavoju.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/bipinajakut.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/ziwujikeje.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210903025535.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/jijofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=xbox+360+code+generatorPDF 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_off0000e4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D5 17876 bytes
SHA-256: c61aacd581eb209aca003b5e2dc12292948d91bf4778bebd3df86c836c6480e2
font_01_sfnt_off00011347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11347 10948 bytes
SHA-256: 1c50e183b496e48912bf39d2210782b0e98f68b3f5b359a151b031d0b514ca69
font_02_sfnt_off00012c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1