Malicious PDF — malware analysis report

Static analysis result for SHA-256 632649fa95e964e2…

MALICIOUS

PDF

73.9 KB Created: 2021-09-17 16:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 09e3fb8d22a48d466ecaa3f955ae2054 SHA-1: 1e89f77c15552b822ff74632e000f306935d3c87 SHA-256: 632649fa95e964e25a4841ac085beaba341a9049839471a2cf64cd066525dc5f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a link farm on disposable hosting and a high ML classifier score. The embedded URLs suggest a phishing or malware distribution attempt, leveraging a link farm strategy to obscure the true destination. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=dragon+ball+z+budokai+tenkaichi+3+wii+iso+download+english PDF link annotation
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/11466968460.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/50588686058.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/nejisituzamatekutuzamufa.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109060325529539.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/naxebatinutejigu.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109052331144756.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/96786384234.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/33515684031.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/57780589615.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/riwisamiwipadetiw.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77541427666.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/61201744102.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6c9561209---kojalisejozojoxuva.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/87745927311.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/50259921305.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/pasajamutapimazinunisas.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/17135365382.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210904_140348.pdfIn PDF document text
    • https://questyme.com/userfiles/file/vewex.pdfIn PDF document text
    • http://zaiger.ru/img/file/85469323659.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/15569988761.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/11457563576.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/96243371413.pdfIn PDF document text
    • http://dogable.de/userfiles/file/vefaturefunurevafum.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_off0000bae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE9 11300 bytes
SHA-256: 1a00916bde997c1d977e2a6ec57d93412f6818057ead2652d4a524b6d77f57bf
font_01_sfnt_off0000d552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD552 17188 bytes
SHA-256: 867c40712a58808119d637f575f1a7045869696502f34fdcd5cdc43bbe9e8a74
font_02_sfnt_off0001012f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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