Malicious PDF — malware analysis report

Static analysis result for SHA-256 562b4eda7d2452d8…

MALICIOUS

PDF

77.6 KB Created: 2021-09-13 12:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50472b7e1eed7673258cdc364c2c82b5 SHA-1: 60c96b86855e68809ce26bae54a57fa97126c5f7 SHA-256: 562b4eda7d2452d8558dff3857782de683a4ef29b6f329722272120307af158c
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infrive.ru/uplcv?utm_term=game+creator+apk+download+for+android
    • http://phdpecs.hu/userfiles/files/giwilijiwezaxokadip.pdf
    • http://inica.org/files/file///nuvomolezaziwu.pdf
    • http://tangiahoang.vn/Images_upload/files/dilasi.pdf
    • http://www.ximangsongthao.com/app/webroot/uploads/files/68074859832.pdf
    • http://cathyknightwaite.com/ckfinder/userfiles/files/devakun.pdf
    • http://pinedafoundation.org/imageuploads/file/difobesef.pdf
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/52722783114.pdf
    • https://citronel.com/userfiles/files/taxexapimojanupagupakepu.pdf
    • http://rainternacional.com/userfiles/file/varevobapajuwexekef.pdf
    • http://geodavidepini.it/userfiles/files/toginulebikagevep.pdf
    • https://gulfb2b.com/userfiles/file/8511441149.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/07cc033c414224912abaf9382714d35c/36013845599.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131643bac07b---xepafixorusotifanajuj.pdf
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/dudojo.pdf
    • https://avukatwebsitesi.trakyasoft.com/upload/files/mepeperi.pdf
    • https://jjcfurnituremaker.com/userfiles/files/saxewijonabigijirilonut.pdf
    • https://ripedzn.com/app/webroot/files/fckeditor/file/suzeg.pdf
    • https://propiedades.net/ckfinder/userfiles/files/zobuw.pdf
    • http://korealabels.com/ckfinder/userfiles/files/9916124558.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/11817002536.pdf
    • https://ambient-interier.cz/files/files/zaxupuxiloxagepemegazibil.pdf
    • https://birsamundapark.in/userfiles/files/pekakejimabixitudadesuf.pdf
    • http://dailyxedayhang.com/userfiles/files/fafug.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_off0000c7bb.bin
f762cd20cd93e7d9d7ed99015afe1f0f915821f605ccbc20c8bc9f4a80604e80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BB 18712 bytes
font_01_sfnt_off0000f77c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF77C 16792 bytes
font_02_sfnt_off00010f93.bin
2126c1fb5b93f9e5676fb7da8af2fe24e9a29b1c43059943242614d1428e3ae4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F93 10832 bytes

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