Malicious PDF — malware analysis report

Static analysis result for SHA-256 4130188affd237e7…

MALICIOUS

PDF

65.4 KB Created: 2021-09-20 01:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d1b3d2af14f82c62eb8bfc1490344bd7 SHA-1: 8f93292c48a6dbddabe7849573ea8106332fedcd SHA-256: 4130188affd237e78100df61458e2dcbf3dae2f827d9a889c0d9cb0854b1edac
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to potentially malicious domains, and exhibits characteristics of a link farm. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8166

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://alshuka.ps/ckfinder/userfiles/files/norikibanipenele.pdf In PDF document text
    • https://drosamahetta.com/userfiles/file/97589564212.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/kotabavagopidisedizuwedo.pdfIn PDF document text
    • http://strandedtattoo.com/file/ritexuboje.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/66503415301.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/59867139942.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/62416457775.pdfIn PDF document text
    • http://wych123.com/upload/files/towevosiruxifexanuwun.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161476ddb9aa47---25694061837.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/wiliwagorome.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109151534488678.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/rizagexubeladizag.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/53138882576.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/d50803549bf15e483a66847d3120a0d2/14867236644.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/bubumadiritemilenezifas.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/sewowareronemefalarelowit.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45979322717.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/74635835804.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/topaviwanuwi.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/63926128650.pdfIn PDF document text
    • http://vtaky.sk/media/file/fatuwalirutiwupip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=android+screen+share+to+macPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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