Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e66e6b120f1557…

MALICIOUS

PDF

76.8 KB Created: 2021-09-19 00:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b6b6a4bfcb231596807ae9a6813854ff SHA-1: a4bef98b53ff4dd24081ff0918838fab3b85130b SHA-256: c8e66e6b120f1557cf7395994cfba47dc3732195755e5ed1c4db3bad6ce8d3d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs pointing to external websites, indicating a likely phishing or malware distribution attempt. The PDF structure and embedded links suggest it acts as a lure to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=full+movies+online+sites PDF link annotation
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16142bb09c88fd---60497369414.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///47854957163.pdfIn PDF document text
    • http://eksternest.be/images/file/ratebeboxabixaxidogijis.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/11885059076.pdfIn PDF document text
    • http://hkalc.com/userfiles/41340288639.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/6617716082.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/84001142923.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/54592393045.pdfIn PDF document text
    • http://speckrepej.com/upload/file/18940799306.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/sefofo.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/41177786337.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/xunusijemitiwijazasimovow.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/kaxujavukapiwevutiwub.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/77172214250.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/jinolaw.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/97925233255.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/sirugawozeletujeretuzilo.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/25041142516.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/3236674377.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ef1ce6f67dfc0d623bd33aa99dcf9775/84145508124.pdfIn PDF document text
    • http://meskerjager.nl/media/files/30743714893.pdfIn PDF document text
    • https://temahr.hr/files/pimijobirugatopidoket.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210907_5DA6F44DB66F94DE.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/33421216161.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/ropozuzukefolubaratuvinur.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_off0000ccc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC0 10148 bytes
SHA-256: 5e174fb3e76fabfe9294b617ab3ffc7f9f9b9a935c1d1fde609feb4a2a1ee8e6
font_01_sfnt_off0000e36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36F 16216 bytes
SHA-256: 5826f7b6e744ee2df537f05faf76e04842b16326a39450b10dfaad5f870810ef
font_02_sfnt_off00010cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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