Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6dd667aacea3d15…

MALICIOUS

PDF

78.1 KB Created: 2021-09-22 15:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2845439552abd890b91cd1209b77be4d SHA-1: c1eb2927ff37b2a4fac0a4c8e4d509217daac047 SHA-256: a6dd667aacea3d15628b5ba94e1b40f4462cc63b205c7bdf17819e5eb20fff1c
134 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external links, many pointing to PDF files hosted on suspicious domains, combined with a heuristic indicating a 'download button' lure, suggests a phishing or malware distribution campaign. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the overall structure and heuristics point to a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://springgalleryng.com/Images_upload/files/86510945545.pdf In PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/93971249679.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/335640180.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/powipunelonuxifuvo.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/34700834842.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/monovijigifel.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109082150095701.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/8fb9f637a6eac3c1b5610b06d7b3806e/11895483070.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/88111225187.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/wegakadekasajij.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/nijovolikurofigakavo.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/remijopumojalodemedovasik.pdfIn PDF document text
    • http://grotech.in/userfiles/file/38645990581.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/35298509896.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///63788258800.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/79808731627.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/89163301377.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/20758493610.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/belodikede.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/11493410837.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/mupepotolijovabiz.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/lm58an6g7l7aipdpo6fmfl7dnq/62360114430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+croods+a+new+age+full+movie+free+no+sign+upPDF 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_off0000cc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41E 11184 bytes
SHA-256: 780b1394c1717fa33613325992bbeacd79631d1d7f9fd6b8cdac3f1806c650bc
font_02_sfnt_off0000fded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDED 17320 bytes
SHA-256: 349613b4092e0d57261b2806e64f9205d6c0edbc781b9e0222d1ba124cc573d6