Malicious PDF — malware analysis report

Static analysis result for SHA-256 d592382f6fa17865…

MALICIOUS

PDF

72.8 KB Created: 2021-09-26 17:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 28fc8c1b5cde504e1d6d0692bd585ada SHA-1: 677c4c42fc453a68a304b75b01ad4f91165e4b1a SHA-256: d592382f6fa17865ff44f5791f8f7952e6283c33cd489f91e2fa0e88e234bed4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to numerous unknown URLs. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URIs suggest an attempt to redirect the user to potentially malicious content, aligning with phishing or malware distribution tactics.

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 http://jcbcharpentebois.com/ressource/site-image/files/374745939.pdf In PDF document text
    • http://nawoo.net/userData/board/file/2834205101.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/ganatigageselowelabali.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/99400812331.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/27680831370.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/49991477240.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/pixitudugaruzu.pdfIn PDF document text
    • http://rubensova16.cz/files/file/29721567548.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/92594566126.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/44108591968.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210903004903.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d246895d94---47445866528.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/70707432524.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/bolesisejagowurogonenam.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/76811380720.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/55027511551.pdfIn PDF document text
    • https://blugarden.eu/file/26648924556.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25440344513.pdfIn PDF document text
    • http://www.bash.cl/media/file/78525192958.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091411293873499.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/34348007048.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/35180214033.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141c8d38ef09---vekojupexokeluride.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+have+ios+14+on+androidPDF 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_off0000b54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54E 18740 bytes
SHA-256: 8588bb5b563545c7fbe7ab85531eea5cde1610e5579a31924c4c6f60ff305238
font_01_sfnt_off0000e5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A8 10572 bytes
SHA-256: b3a914a93fbeae6275722054673834664df91b4c0dfc6f88d4f6e5c3f0dddc12
font_02_sfnt_off0000fddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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