Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f31ba6a61063ba…

MALICIOUS

PDF

70.0 KB Created: 2021-09-28 14:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3e76f7eaf6bc173378f61696e1a8cab9 SHA-1: 6fc3d6652e562d73a1d933e715ce978417573b57 SHA-256: 57f31ba6a61063ba5075be92e25b6f13c8ea48e867840009f7ebbcb2a9f47b8f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the conclusion that this PDF is part of a malicious infrastructure designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://congtyvima.com/images/Download/zagorelelalodu.pdf In PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/53972958048.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/14082731970.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///78900761533.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/271940695.pdfIn PDF document text
    • https://noglehoma.com/ckeditor/files/files/butimigibukulova.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8d1402064---32415348252.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/vusifozebuv.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/20654358432.pdfIn PDF document text
    • https://svltv.in/userfiles/files/bijadotiwugituxinukikumu.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/us4a1mnbqid7runnr6ve6pasbl/pajufow.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/nonokorenazixa.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/11697274692.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/munagakaxipogimegodesib.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bofudazepavaxegerufiji.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/buruxu.pdfIn PDF document text
    • https://subarini.ro/mm/file/43303926412.pdfIn PDF document text
    • https://ef.msfoody.com/upload/files/2679429415.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/zifowugerevetiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=amazon+instant+video+apkPDF 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_off0000ad18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52F 10608 bytes
SHA-256: 5be6af11ae15d0bc998604e0f740a6a9a22e7101e4045901a85be73687b07aef
font_02_sfnt_off0000dd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD82 17616 bytes
SHA-256: 526fbe9bec89dd2c8ba5e8f08484d18b7a9aef15c7e05e88f700419ca7738c91

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