Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95d473cc3c9496f…

MALICIOUS

PDF

78.9 KB Created: 2021-09-18 01:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 41e2deec639d169f5d4879894716e03d SHA-1: 72fe02dc06c82a9acea8ef2ebb854804b6f59047 SHA-256: c95d473cc3c9496f8332c40e3429a6135fc10cbbfcc1a82648f3a52407ba3f1c
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to unknown domains, suggesting a link farm or redirection mechanism to host malicious content. The PDF structure and heuristic firings point towards an exploitation attempt, likely to deliver a secondary payload or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://rassadaspb.com/new/files/file/3333040384.pdf In PDF document text
    • https://anglarill.net/userfiles/file/zepawuvilumawudo.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/44864422338.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/51002488754.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/7899341808.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/13233605440.pdfIn PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/20834721792.pdfIn PDF document text
    • http://geodez.com/pliki/file/20277498180.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/nezuposawoxexuwoso.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/dikagigo.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/78832684074.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021091008292473499.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/bavowetewefadonesaxi.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/nonexiju.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161312a64d4d1f---75787592176.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/58381986699.pdfIn PDF document text
    • https://salonrewards.ca/images/file/tulidobebenozesovojo.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/90224303179.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/2466071508.pdfIn PDF document text
    • http://ned.ru/uploads/files/wenivarefoj.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/72048450403.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/1378344054.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/87741855303.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614337c54c1d4---83404811698.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/xiwusafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=picshot+photo+editor+apk+downloadPDF 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_off0000ce38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE38 18160 bytes
SHA-256: 78a2071a6b52c02fa6e7d8c9d31b0c005ff5c239ae421e6d88518366877eb21e
font_01_sfnt_off0000fd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001153d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153D 10792 bytes
SHA-256: f9cee5d60651522773ad6556de1ebc92fd22872ae73eb8e33eb91b4c037d57a6