Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4322211a6a0349a…

MALICIOUS

PDF

65.7 KB Created: 2021-09-25 16:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0954ae0af0a15885c298780b1503390c SHA-1: 878e6635b444a2b4df830d39a87a08e100dfe63b SHA-256: f4322211a6a0349a4305a9f4416ee5ed3cf8f7a1900a63a282838d7cef114c03
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of numerous embedded URLs points towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8595

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://kukdae.com/files/fckeditor/file/56611194128.pdf In PDF document text
    • https://stalbeckers.nl/userfiles/image/file/53630260336.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/76779839476.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/89vfum3f874an7dnnigmrlct5b/velidejir.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/57616098352.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/31891152032.pdfIn PDF document text
    • http://arsvet.ru/img/upload/99353696409.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/64857986841.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/6585622376.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/77435766085.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/29dfl1pr40ju82gq05vm4g7hqv/kuzikona.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/dugefejifudelijevudo.pdfIn PDF document text
    • http://surinmajestic.com/phya/ckfinder/userfiles/files/53691743840.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/walevubasiw.pdfIn PDF document text
    • http://myphamasia.net/upload/files/24873779826.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/kematudiwezuwuvafip.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/rugeraxe.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/nimazeg.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/59093696003.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/18086752894.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/42640632813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+restore+corrupted+photos+in+android+phonePDF link annotation
    • 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_off0000aeae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAE 15720 bytes
SHA-256: 1ce607ae5d92779bc4261e8adb591361148a7eeca82187e438e23a425e9416fa
font_01_sfnt_off0000d63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63F 10740 bytes
SHA-256: 46514ad5b92913f5d04f4cba20564792b5621de4a56ce78e2de386eb5300b710
font_02_sfnt_off0000eeee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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