Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c8a0b45dacd1aa…

MALICIOUS

PDF

73.4 KB Created: 2021-10-07 04:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8a3c48abfc71c46e707b177c22c282ff SHA-1: aa1c3891791cf216a29a451e5457ac84aeb8e95a SHA-256: b8c8a0b45dacd1aa8ba43f1003608e7161d75f0f4ed450707538be469f5d5393
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the document's primary purpose is to redirect users to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4113

Heuristics 4

  • 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
  • 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://ofitecnic.es/files.ofitecnic/fck_up/file/59621654924.pdf In PDF document text
    • http://ky-auto.com/uploadfile/files/befofodumudorewilizetap.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/wusizizudedasekinok.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/13621447033.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/gunapunazigif.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/59422753917.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/59475244258.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccc306b797---kutenadodiw.pdfIn PDF document text
    • http://bourgogne.annuaire-regional.com/ckfinder/userfiles/files/kafilimalukajejowinune.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/163300702669136991271.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/poloxuferoja.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/zawozazab.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/63317453208.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/venaja.pdfIn PDF document text
    • http://chinahongji.com/d/files/tosunufilipibifujar.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/22097303719.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/fetikosarejokiweb.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/pomeletatoge.pdfIn PDF document text
    • http://hbaoge.com/upload/files/vopaba.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/67660915781.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/kefidaworoxewigo.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/82040935249.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d57461fec---xekerogaliniduta.pdfIn PDF document text
    • https://cowik.pl/upload/75151851642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=love%27s+executioner+chapter+1+summaryPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD607 19028 bytes
SHA-256: b88bbdada9b5c93182b9e6549043bd29ec9e6de257108e841f0490b6272d67d3
font_01_sfnt_off00010790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10790 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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