Malicious PDF — malware analysis report

Static analysis result for SHA-256 c26ef3910d45eea7…

MALICIOUS

PDF

105.7 KB Created: 2021-09-16 17:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 60e4e79634a36b1ee621df636ad8524f SHA-1: 68ee24ebcf21705841dd27f613bb7e1794441d94 SHA-256: c26ef3910d45eea7960a123b5aaf1ab118334d38582de2f013c35b4367d025ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one pointing to 'smidgel.ru', a domain flagged as a link farm on disposable hosting. ClamAV and ML classifiers identified this PDF as malicious, specifically as a phishing or trojan variant. The presence of embedded URLs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=specific+ringtone+for+contacts+on+android PDF link annotation
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/42756149067.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/29309695587.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/8179434911.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/mafexuxurapagu.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/55363510870.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139615d9c16f---87932120293.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/37334428078.pdfIn PDF document text
    • https://losungversorger.com/product/file/36143530794.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/patagudalaxesewutovasor.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/74385518509.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/13981245873.pdfIn PDF document text
    • https://allianztc.ro/files/file/tomakegiw.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/42045965251.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/26320033183.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/liposuvezuwewezupodared.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rubipamive.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/23575344548.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/75449134312.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/eb70cff0098e9545c77a2d15b5ba4de3/16305685817.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/polekowixawavafikev.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/golimisoresun.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/nogevofexataze.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_off0001364d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1364D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E64 10824 bytes
SHA-256: 701559b0f6bddc391e9bb00c469bd9af78da66455580d029ee95ce5855c6a094
font_02_sfnt_off00016741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16741 18856 bytes
SHA-256: 1f9df827f07a6fc8133b925f2ac7ee75e13b04e65d8b0404cffe49943c9c110a

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