Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d6566e91ec9aaa…

MALICIOUS

PDF

86.3 KB Created: 2021-09-17 23:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bf5a06b53fe3e2ed3ce740359ab9dfc6 SHA-1: d13b14a831f1e41a7c916f4f6322733d511649ad SHA-256: d2d6566e91ec9aaa3153ff33fd4649f2af8be3e8c5d6899a1103fa335501babf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a phishing or link-farming attack pattern. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coretry.ru/uplcv?utm_term=iso+ppsspp+games+for+android PDF link annotation
    • http://i-physiology.ru/upload/taxipitanivigux.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/54261413094.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210912005035.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/sodesipugibenelevuragozu.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/42287873807.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/20976690623.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/34998494539.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/xekarezagidonejapugofida.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/bowugutalitapafije.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/vawukuwufanevemupajukizi.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/juvoduwitigepi.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/1875223259.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/pipukavaguteduwaka.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/bfc3hvl0ksfaq6oka6inuh3jh6/ranujipetadixasab.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/52896597533.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/95412842012.pdfIn PDF document text
    • http://bollnas.boj.se/uploads/userfiles/files/tokafutixe.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/wagomejipawilozajura.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161401ddc17d1a---67482264364.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/galovibadosop.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/vujakutewo.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/50265361966.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/kizukezome.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/54650665618.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_off0000ee30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE30 10648 bytes
SHA-256: 2215964a963e81a4d868280dd36d29bce5d6908cc32f8bd2de823a53d8aae2b2
font_01_sfnt_off00010657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E69 17844 bytes
SHA-256: 30b84abef594b1a3c13db1bd36a0419cfafe9dd132918c0b97c6ff0f356711cc

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