Malicious PDF — malware analysis report

Static analysis result for SHA-256 52bd40675ba62fe6…

MALICIOUS

PDF

73.8 KB Created: 2021-09-23 00:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fdd31d006a5a110125d0d59d65399a85 SHA-1: 8dba3cc082df200705759db0b3f03c8d46cf75d7 SHA-256: 52bd40675ba62fe60901556fbf5c0ce39df2d0932f404f2032a522400485f0d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs, many of which point to potentially malicious PDF files hosted on various domains, suggesting a link farm or distribution mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination or spread links across many domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://odnoklassniki-files.ru/images/uploads/files/35783379161.pdf
    • http://beta-rc.com/upload/files/nuxebujogeje.pdf
    • https://sieuthimayphat.com/ckfinder/userfiles/files/86125770226.pdf
    • https://abrasco.org.br/ckfinder/userfiles/files/lutubagovapololud.pdf
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/97114049338.pdf
    • https://odlingfamily.com/userfiles/file/fokepudesibikugokuk.pdf
    • http://papinchess.ru/userfiles/file/zabetajitarexuxudimubiliv.pdf
    • https://businesslife.com/content/file/87646865185.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb70d64205---foravujo.pdf
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/41279806051.pdf
    • https://eminentland.com/admin/userfiles/files/84637887665.pdf
    • http://80tner.netsociality.com/upload/files/dorebesikaxawumonotibo.pdf
    • https://aspirecambodia-edu.org/userfiles/file/67852029926.pdf
    • http://goldenstarhotel.vn/images/uploads/files/69735522557.pdf
    • http://xingyeknitting.com/userfiles/files/segodetepi.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fb21c535a---senopumaxed.pdf
    • https://netiko.ge/img/Data/file/29331344544.pdf
    • http://federicozucchettiarchitetto.eu/userfiles/files/64464741596.pdf
    • http://suaups.net/userfiles/file/6886486475.pdf
    • http://jiachuankeji.com/upload_fck/file/2021-9-19/20210919053732258608.pdf
    • http://bike-aholic.com/UserFiles/file/2970323015.pdf
    • http://seychelles-resort.com/images/blog/file/wizufetebilozaworubuz.pdf
    • https://www.sistemkabin.com/ckfinder/userfiles/files/27820792053.pdf
    • http://fiumevivo.it/userfiles/files/24228910838.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=full+screen+camera+app+android
    • 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_off0000bc12.bin
2dd8eca05127265288885b6118733f78adc56af1b2d5bc6d398f8310ced24914		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC12 17668 bytes
font_01_sfnt_off0000e9cb.bin
6ab6ed930cc4921b25f59794ae8b3ba5f513df49cc2bdffb5dbffc5f175bafa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CB 10656 bytes
font_02_sfnt_off00010219.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10219 16792 bytes

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