Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b89c45b7fdec356…

MALICIOUS

PDF

102.5 KB Created: 2021-09-14 08:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b18d8d08c3cd2d50cb9b8b37ca173df SHA-1: 7c48bfb1f4987ccca9f1025dd36b7db4a8986cbc SHA-256: 4b89c45b7fdec356e8a13b95f84b955781e07a4299810457c2b2e3daffd98c66
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://pagodatalk.com/_UploadFile/Images/file/85451057500.pdf In PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/92444256238.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/nilikewamorelimamiris.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/29058286433.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/zenagovemutagusijux.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/dudenufevituxujug.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/mipilidex.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/dofulunusakilijizaje.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/lifudelukatemadulafafodo.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/19002196871.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/suvotugego.pdfIn PDF document text
    • https://quizai.com/uploads/files/vakuguwim.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/kavodimubakemexiwaguw.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/jedufododad.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/86360147745.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/fivevokujegoleza.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/13459295199.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/xanulurikezif.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/15762887417.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/12826115735.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613994e497c52---46113173977.pdfIn PDF document text
    • http://headrepublic.pl/images/files/nisuvuxufoxutira.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/46286863275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=tom+%26+jerry+film+2020PDF 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_off0001302d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001483f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1483F 18852 bytes
SHA-256: 2bea033c4451ff12a5c3bdaccd0599dcf0249a9f68ee205b30c165ba7b6801ac
font_02_sfnt_off00017943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17943 9324 bytes
SHA-256: 0435703591555079fd1e345d5a2cbd37c969bd88d57a9d9c4009dd4fe7cf6bd7

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