Malicious PDF — malware analysis report

Static analysis result for SHA-256 53c32eb782882be7…

MALICIOUS

PDF

75.2 KB Created: 2021-09-09 13:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5e6f8c50a7deb22ae65d9d9e62bb964f SHA-1: 17027ed032222928484c784df3eda5d7b0f5ae23 SHA-256: 53c32eb782882be7107534f9eec053434441a0e9ddaa014d74f967b5313520f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying a pattern of numerous links on disposable hosting, often used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://laborke.ru/uplcv?utm_term=toy+story+2+ps1+iso PDF link annotation
    • https://xlspandoek.nl/userfiles/file/vomizaluka.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613687ac64e21---47743128327.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/zakusimurapaloroniletedu.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/wuguwaxiwal.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/91840503810.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/93976399783.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/76003829918.pdfIn PDF document text
    • https://ms02bet.com/contents/files/jimazelefux.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/40718018494.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/tavuver.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/95106402006.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/18797495984.pdfIn PDF document text
    • http://imoroz.by/upload/file/bevaxetarilin.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/levuxosirazapunizegag.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/pixekutasaxofeg.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109061649057730.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/8255907523.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021090111343470.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/poxotonokirelenebesogek.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/bdac4580639eb76c3ff8f52bada7dd98/rumopababifoxekirawosuzoj.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/69995171836.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_off0000c64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE63 10052 bytes
SHA-256: 3bb573f8ed70acfd508488432c17bfafd6ed094457a0c98a02ac30777947952f
font_02_sfnt_off0000f4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F5 16660 bytes
SHA-256: 0363d30710a68570e7c837eeb59ce0f5ca930cd8efd3c58aa2d4256506e487f6

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