Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f21309dd9a9dc43…

MALICIOUS

PDF

54.6 KB Created: 2021-09-27 15:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 08e6b008885552cae155413c15cdf8e7 SHA-1: b3d9b52d54fb399c8253b0d01dedca975d1256d1 SHA-256: 1f21309dd9a9dc43d96cfdfb57179096ac1c42fc12a8e9426470f5ef5b46c358
124 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of distinct hosts and links, reinforcing the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8104

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 http://mcdanielz.eu/files/file/71940547992.pdf In PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/sobiwesefer.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77948841445.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/bekexejotenirujo.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/86407985066.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/zozifegomebuzon.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/bazolabemefubisexut.pdfIn PDF document text
    • http://maxbrio.kr/files/files/41027279816.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/55383362479.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/74952068414.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/54287038363.pdfIn PDF document text
    • http://101balkon.ru/upload/files/52333733315.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210919100610.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/gixanopumekijukemubipagu.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/21116005013.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/75977669969.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/lajijabopimusaladuw.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/39798794572.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/vatapupupebavanajito.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/0310e272dd51d78b1bc0909cecf0b4e3/27965308078.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/82992444856.pdfIn PDF document text
    • https://tablouri.emilianchirila.ro/imagini/files/pubizizorawino.pdfIn PDF document text
    • http://floramarble.com/uploads/36418382328.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/bec8471f2f65cc49e97b80d26c1143df/piloziber.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=robux+generator+no+verifyPDF 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_off0000b7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B9 10740 bytes
SHA-256: 4f9a59e16b54c1109fe540afbf417e1a3462d7dd79ec60866c27b39054baf027

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