Malicious PDF — malware analysis report

Static analysis result for SHA-256 293333dd4f2485d6…

MALICIOUS

PDF

69.9 KB Created: 2021-09-21 14:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c41099a6ac6574b616509b340eb5005b SHA-1: d2ed92c3b5b5352b0a859854af2d8d723d524ebd SHA-256: 293333dd4f2485d613659c342374a7bc57ef4cad0a7ba67111699351b42a8187
124 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a high number of embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure points towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6691

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://medvor.ru/uplcv?utm_term=phone+sensors+app PDF link annotation
    • https://balajitutorial.com/admin/userfiles/file/9462723763.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/pofelimu.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/44791337336.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/duzojigoranezitidepo.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/redalanupomowitikidilod.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/murep.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/kexalamavixevexojefam.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/vakexu.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/95934893531.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/90786263328.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/tulediwozozulubakirawepof.pdfIn PDF document text
    • https://limsurempat.com/contents/files/10171943709.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/4456b5630a8374d0555e9289ea115079/52874526344.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/23839578575.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/kizalemi.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/26461996619.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/84200553226.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/naferop.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/31505251469.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210905_130757.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/3035529350.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/dixus.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/pijipaw.pdfIn PDF document text
    • 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_off0000d9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B0 19040 bytes
SHA-256: eca37aec922a18ec832ee27cd6d6f8126d76b7c5595e0d26ba6688763017db26