Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c5310bfb8a72be…

MALICIOUS

PDF

70.4 KB Created: 2021-09-19 08:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2edf791b3c6a44bdfca6c9b6e4aaaf8b SHA-1: 90fbef8ea87ff898c4582a6409a5ca5712d06c01 SHA-256: d2c5310bfb8a72be918d30dc1620f9f4230936f62c8bda64c5200b351981bff2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://krisoc.ru/uplcv?utm_term=imageview+click+effect+android PDF link annotation
    • http://erdbau-rauch.at/50318595198.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/fabezofemumapubeletoz.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/98625133408.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/dasajoruzibo.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/zemegudedunukor.pdfIn PDF document text
    • http://ellev.fr/upload/files/tiradopavedazorawipoxox.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/55158094636.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/pofarufirafilanufixuvot.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133f3d4f280f---52758908994.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/28dcbdfe228d15fdba06f00158613c92/gijigefivoxuvoxo.pdfIn PDF document text
    • http://metallpress.ru/files/jafavebevuza.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/semisalepudi.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/rumaribekum.pdfIn PDF document text
    • https://edgecs.com/documents/80827151195.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/94605793887.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/24939502661.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/nedate.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/75532784485.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/17310413893.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/xolowifamew.pdfIn PDF document text
    • https://pcetravel.com/files/file/94755667820.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/26859861121.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/59438483422.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/47192578460.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/baxiwopodewujasaz.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/gajebunine.pdfIn PDF document text
    • 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_off0000b4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD16 10844 bytes
SHA-256: 57cb33674b75b608027e887a81aa59e1afc03e71b92b9f7ea390c39519c6e580
font_02_sfnt_off0000e5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F1 15096 bytes
SHA-256: 144da2a037f42d4c7891655723d7d379663b27ddc810377be88b77a7d5b7b88e