Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec1416e4f291dede…

MALICIOUS

PDF

62.5 KB Created: 2021-09-17 01:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4919e942f9306ab1523ac4475bb28e10 SHA-1: d0aa54a6fd77d23ed4f4b6b786d8cd39dd189b84 SHA-256: ec1416e4f291dede703c6309d3a9ccd5050821f68914af56c245dffcf098b994
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by heuristics as a link farm and by a machine learning classifier as malicious. ClamAV also detected it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially malicious sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6958

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://www.q-jin.ne.jp/ckfinder/userfiles/files/60000539596.pdf In PDF document text
    • https://ehlibeytalimleri.com/resimler/files/ketifemifuwufegatijubox.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/4928565646.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/75891965928.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/86138180367.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/fosunonogolatulitopop.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137930aaf277---libabo.pdfIn PDF document text
    • https://cet.sk/res/file/23390627615.pdfIn PDF document text
    • http://egitara.com/upfiles/files/diwonok.pdfIn PDF document text
    • http://uco-kampen.com/media/files/galewibomejet.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/90473106083.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/sixugikode.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/sosemikaw.pdfIn PDF document text
    • https://mikludava.lt/images/files/41163975965.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/dikufibul.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/84426209913.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/kisejosukivovujuxafipoz.pdfIn PDF document text
    • https://fivetc.net/uploads/files/xekinuzebunom.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/29428454646.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/rekugokoroxanesajeted.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/35876477787.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/bewini.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/16798786893.pdfIn PDF document text
    • http://prestopc.it/upload/file/xovuneva.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/lenunigarotekobezob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=rufus+64+bit+windows+10PDF 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_off0000cb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE351 10696 bytes
SHA-256: e9e5d96f8a6f035f24265d4f7a2fb36f106e896125d6d3dc4ac839e95d01cea4

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