Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b426c07c177178c…

MALICIOUS

PDF

78.8 KB Created: 2021-09-09 16:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a5c7a7aa9d22504ded9dce824bb32e6 SHA-1: 4b9aae779e3b44226dd3678cf1333d8cf9660ddf SHA-256: 6b426c07c177178cec696fb4fe581474b19be7eb46ef6bd6ff3e437f723bdf4a
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. The PDF contains numerous embedded URLs, with a heuristic indicating it functions as a link farm on disposable hosting. While the document body is heavily obfuscated, the presence of many external links suggests an attempt to direct users to potentially harmful content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://aptekarynek.pl/zdjecia/fck/file/15049801548.pdf In PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613682b04419d---27433495793.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/62668280075.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/95276021225.pdfIn PDF document text
    • http://exosushi.com/uploads/files/50095404254.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/66682145560.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/xujiwokox.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/6f23b6ab8287c723e0b57082f90101a2/46289037054.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/58758902726.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/fukaginirewowu.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/1078709153.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/nutelemonemufufojokupexag.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/5955400226137d392c4afb.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/34fi1ttbjekdek2a3mt1anthqd/zabafirizagolexubepodivu.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/54273901645.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090723021850.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/66554766866.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/77347648610.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/72839606524.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/63037381928.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/safelolilolemoribo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=suzuki+piano+volume+3+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000cc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1B 18396 bytes
SHA-256: bcf576082e08bcbcd114cce6d1369e57844b6bd6825c5c325ca08a36f277a136
font_01_sfnt_off0000fca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B9 10860 bytes
SHA-256: 995867aeb17a4f36d721aedbbfae6a31a764b89f0b1bc55e06d8aefe3dcd57a9

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