Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f23a34b5dcc9769…

MALICIOUS

PDF

71.9 KB Created: 2021-09-23 07:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c8569380188449bad96f4697e61fa8c9 SHA-1: ed7c9bd8195a6f3b1ab2d4580d13db6c6f3e241f SHA-256: 4f23a34b5dcc976952bf802681a44a0d7f0e3e6ec31bedd01e11686ace408473
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to potentially malicious domains, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7118

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://gtshotel.it/images/file/47952472642.pdf In PDF document text
    • http://doktor-okonski.pl/uploadimg/file/42986348584.pdfIn PDF document text
    • https://adikketiga.com/contents/files/pigegowifutofiwedepu.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/ralejizijutufazifofozupa.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/6817860792.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/wejapofiniwapagono.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/remugegotepakupup.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/71901895447.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1632029485s9V5.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/pufilorudatu.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/9140752865.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/xavin.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/pinarifikalobiwezunujiv.pdfIn PDF document text
    • http://www.polni.si/Images/files/kanatamasijaresijo.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/kiwemabe.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/kawofinogoketagoxup.pdfIn PDF document text
    • http://zuszdounky.cz/files/fowodegadusi.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/nunokiragezo.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/dugolegomojomevo.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/xefavefetosenovisofawojed.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/44597924719.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/zogoxiwupuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=pubg+mobile+lite+apk+download+new+updatePDF 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_off0000cbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD0 10888 bytes
SHA-256: 85072e324e53fdcd0679493bc5a17301dae9f948b91cfe1f9667ac91b9281c9f
font_01_sfnt_off0000e493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE493 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1