Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a22733ceb3de192…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 03:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 093c2a38591bd045dad0a0781dce216b SHA-1: 4539c1e40f96f5e9f9b0fee64c09b1c1e8494bf1 SHA-256: 1a22733ceb3de1921589ae860cb6fa61751adc7f167c7b22d607df91936d377d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to external sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests these links lead to a collection of disposable domains, likely for phishing or malware distribution. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=tubemate+apk+free+download+2021
    • http://www.corazondelsol.es/ckfinder/userfiles/files/fokodezapijazutuze.pdf
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/nugonivu.pdf
    • http://tjsyjdq.com/v15/Upload/file/202193131884829.pdf
    • https://alshamiltrading.com/alshamilfiles/file/vonezosuwugudawujiniguf.pdf
    • http://baovethanglongmb.com/upload/files/nenagojutujodofazadi.pdf
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/niwemupozapowirelesafivuf.pdf
    • https://biographiewerkstatt-singer.de/userfiles/file/rominu.pdf
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/4633293826.pdf
    • http://kaizousha.com/js/upload/files/73453669331.pdf
    • http://www.siscbolivia.com/admin/uploaded/fck/file/68193280081.pdf
    • http://palmdale.thepokeluau.com/uploads/files/wevop.pdf
    • http://armanetti.com/images/56610159480.pdf
    • https://peiitw.com/Upload/ckeditor/files/97028078826.pdf
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/7359399755.pdf
    • http://www.supair-lux.hu/ckfinder/userfiles/files/83572395785.pdf
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/18013577519.pdf
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/vomiwirukifopud.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/f403cb38ed6b87223d32012414237c38/89057039253.pdf
    • http://discus-rus.ru/upl/file/62276173093.pdf
    • http://harckocsik.hu/userfiles/file/77025605615.pdf
    • https://dpengineerindia.com/admin/userfiles/file/16844262769.pdf
    • https://projetovm.com/uploads/files/13177909433.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3f3.bin
6cdf790ba46d3a6bd71f3fa7f5f1cf457638591ec76c90a96d000ac10c522e0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F3 11072 bytes
font_01_sfnt_off0000eda8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA8 16792 bytes
font_02_sfnt_off000105ba.bin
8f0f9af9f4712d173f95c5906ed578fec373fa239e76c39684fcb0d1cbd0d071		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105BA 17932 bytes

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