Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21196bff8329b07…

MALICIOUS

PDF

80.3 KB Created: 2021-10-16 14:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 01c777e0c1361cbb47931e516aab18f1 SHA-1: e1c15175178e3e2b229f065b494106470c8b142b SHA-256: e21196bff8329b078bb7d8b0269888bacd7b883fa198d1d83c3914fd16401fec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.sunriseacademy.in/ckfinder/userfiles/files/zapalobakibiwapigeniji.pdf In PDF document text
    • https://speedwayinfo.hu/uploads/file/xidofixura.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/39233564693.pdfIn PDF document text
    • https://mavibusiness.it/file/9456237426.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa62a8d746---xabusunaduvo.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/xunesinirapejikuvidedoka.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/83223335482.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/51991639191.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/40194769623.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/23264131787.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/muzoleruwibozubasep.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/wotadiwenik.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16162b7e43f312---rezalulamitedolawowerix.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16159a9fada37f---ruligoxexikekurebokoxu.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/midafopol.pdfIn PDF document text
    • http://mayjack.com/upload/files/53025575495.pdfIn PDF document text
    • http://kd-council.com/upfile/files/zofitinifezaxanesu.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/nifolenaxugo.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/79961725179.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/68060697400.pdfIn PDF document text
    • https://slide-bearing.com/d/files/78485961873.pdfIn PDF document text
    • https://adikkedua.com/contents/files/66033132524.pdfIn PDF document text
    • http://csavarkompresszor.hu/userfiles/file/97787204396.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/tofizedafupu.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/BcFPVxLj4jw/uplcv?utm_term=how+to+send+a+pdf+book+to+kindlePDF link annotation
    • 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_off0000d685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD685 17088 bytes
SHA-256: c2fa0482549d4df5c205509ee7d0937532bb6695bd7b6d02a56a6ddb0d35a930
font_01_sfnt_off0001034c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034C 10700 bytes
SHA-256: 37234c3846ca894aee976979bc4c6241302cd356e94cc92e7596e2a960e2a09c
font_02_sfnt_off00011bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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