Malicious PDF — malware analysis report

Static analysis result for SHA-256 13fab763edb5e00a…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 12:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c80e2305bd7e6d16e6a964ae5d79f73b SHA-1: 3317d056dd1fb4d5e526094d7083d656e99d9740 SHA-256: 13fab763edb5e00a674d6b16477663fd7d0a16a5581f8ddfeb59813861cd790e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=fall+guys+free+download+pc+online PDF link annotation
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/tovevezelitazafif.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/6014037994.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/16405773260.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/pizube.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/gawamifenijudakowolep.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/jotikedoxap.pdfIn PDF document text
    • http://msiutilities.biz/documents/guzegawakesavuvo.pdfIn PDF document text
    • https://energooptima.hu/upload/File/88815167527.pdfIn PDF document text
    • https://yasacompany.com/upload/files/12005990992.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091516433739.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/81449454171.pdfIn PDF document text
    • http://edallyshop.com/upload/files/19042062490.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/bexoxaf.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/91851111901.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210909161950.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/62606464705.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/jujotazubefanir.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/186779f7c4ae64681678847b3779eda7/62739082107.pdfIn PDF document text
    • http://tcihk.com/userfiles/34982128695.pdfIn PDF document text
    • http://www.moyekolodin.com/files/58513374433.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/xokebejowuvawosopajitufi.pdfIn PDF document text
    • https://bachson.net/upload/file/sodevimifuxikiwegegomemaf.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9f196f67b---wisix.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/tulagukewukosevapo.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/fowefibiwirutobegalazuku.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_off0000ddf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF609 18044 bytes
SHA-256: 174d8821fb91e18df714457394cf45e2e88ec2c8d86966da0642cfa5f492ae69
font_02_sfnt_off000124da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DA 10972 bytes
SHA-256: 6ab9fdb44975387156acb7fa27d4a90938fb77c6e59d25adea3f28ea4cfebeae

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