Malicious PDF — malware analysis report

Static analysis result for SHA-256 5665a633dce5f8fa…

MALICIOUS

PDF

116.6 KB Created: 2021-09-18 16:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5b2928258e1426a9aca7c2c457ee8c77 SHA-1: 1cef029dfe7e4ebd610194b21103fefe59a63fb2 SHA-256: 5665a633dce5f8fa57167077f43fa3544dc6ce6fba207d9671959d693618d925
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous external URIs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high volume of distinct hosts and a redirection pattern, suggesting an attempt to obscure the final malicious destination. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://shieldtech.cz/ckfinder/userfiles/files/83736214556.pdf In PDF document text
    • http://ckud.handysociality.com/upload/files/95339713732.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/zufejivajageni.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/81113819893.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa6604d2f9---nupet.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/90359228066.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/16666344069.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/97626052802.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/95539789195.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cab8543f4a---ropaj.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/vobuwikusaro.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/13612678178.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210902_418D983D302F11BA.pdfIn PDF document text
    • http://archive-2014.humandoc.pl/attachments/file/83961689966.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/sosotopamazevule.pdfIn PDF document text
    • https://ancoraeducacion.com/images/vavifivolonaxanudumixu.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/72782075559.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109072038488520.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/84573843395.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/sezaf.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/81670832600.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/ribalafawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=joanas+wow+leveling+guidePDF 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_off000163e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163E4 18640 bytes
SHA-256: 76247ecdb35c3fce7da35458250860585ee3d1fd8de78a2b5841a1d44c4d9a18
font_01_sfnt_off00019483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ac9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC9A 10468 bytes
SHA-256: ae47cedf0e1a1a95e8e8d2c05269c5bfc66a4ea52c01da73d915b13367e9a435

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