Malicious PDF — malware analysis report

Static analysis result for SHA-256 a69f12ab3fb97f50…

MALICIOUS

PDF

85.7 KB Created: 2021-09-16 10:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c366d458acf394ac8967b77745deca18 SHA-1: 3a136c0353952ccafcbf6d2cd9bbf18b72d2501a SHA-256: a69f12ab3fb97f50b47230193396ceded7a9f257a78713e7bb349e1d09719284
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious content. The PDF structure and embedded links suggest a phishing or malware distribution attempt, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5478

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 https://accidentmatters.com/ckfinder/userfiles/files/vabiwor.pdf In PDF document text
    • http://abwgulfport.com/uploads/files/72820404403.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132d5f70f8f4---12722907842.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/69322137217.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/71485517672.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/20213928194.pdfIn PDF document text
    • http://polipack.ru/content/file/49013049754.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/mejabagefoxuximemusunitik.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/79497229605.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/gogamirabiforisolenuteral.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/254785653f59ce1d80a24cbe984c8f33/50002697893.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/66628676782.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/padolibetefewojibewu.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/57161936569.pdfIn PDF document text
    • http://beta-rc.com/upload/files/wekagi.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/vetibegelisu.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/89881424300.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/51608118818.pdfIn PDF document text
    • http://anninh247.info/upload/files/wipovurarakagojel.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/77254581981.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/26955626418.pdfIn PDF document text
    • http://halaljones.com/uploads/files/95780128425.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lojetomulokibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=beste+kinderspiele+androidPDF 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_off0000ec0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 22080 bytes
SHA-256: a55e432f879f90d6abf5070e4c64e7fa8e3a7578c2ca4863eacc7d16c76fe9dd
font_01_sfnt_off000123b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCC 10528 bytes
SHA-256: b0eda03267ab3c092086b28a18b6a09e86b3e30a53b5ecae41c11cab8f94af50

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