Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ce82f19d169fd8…

MALICIOUS

PDF

66.4 KB Created: 2021-09-25 08:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 51b03e70025eccb31b96f329cce00b65 SHA-1: 5e580411aac1e611a9ad23a8a26d38755a8d3b1b SHA-256: 73ce82f19d169fd87112caee019d6b834016b69d002c57276543aef71e9d71f5
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many pointing to disposable domains, and is structured as a link farm, suggesting a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to obscure the true malicious intent through a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7617

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 https://hinodecoder.com/userfiles/file/sumuwanuramibasaruxune.pdf In PDF document text
    • http://ecolservizinettuno.com/userfiles/files/89509479957.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/99212479900.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/36464338485.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/12173631106.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/1705373774.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/verokigoma.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/614b44edbf3f9.pdfIn PDF document text
    • http://oldstat.ww.tj/img/file/vuwabaxugidokukib.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/wijurikexuvex.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/gokut.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/mibaw.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/ginukajevimipesawed.pdfIn PDF document text
    • https://phoneeucom.zabolekarburgas.com/userfiles/file/84503343160.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/rusowenapimixo.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/2d15h92k86046ou6frjnp18tl0/28932657168.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137f7cb04a83---52238764518.pdfIn PDF document text
    • https://koratspring.com/upload/file/99179477221.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/41377729072.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210923184802.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/puvisibipupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=comprehension+exercises+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A0 10712 bytes
SHA-256: 34438a3ead34bed42a40d98b5af0ffaa0fa64f1b3130adfc27f509bb313896ab
font_01_sfnt_off0000cc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE415 17752 bytes
SHA-256: a07ea60a70e267ce148b2b0ad7226c5fa18d6fa8ed77c18c00165632b3d7c9f0

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