Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca0199f4c76ca45…

MALICIOUS

PDF

92.1 KB Created: 2021-09-20 09:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 861274c87336174ede511e65bd6b990d SHA-1: ec8860fe479aef47663ea1678431102636a85fe6 SHA-256: 4ca0199f4c76ca45230412e9e98a0cb7e744158dd920fcdcb2beb684427f39ba
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially malicious domains. The PDF structure and the presence of embedded URIs suggest an attempt to redirect users to external sites, likely for phishing or malware delivery. No scripts were extracted, but the overall pattern indicates a malicious document designed to exploit user interaction via embedded links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2680

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://coretry.ru/uplcv?utm_term=how+to+save+my+apps+to+my+sd+card PDF link annotation
    • http://knupress.com/pds/editor/file/vafelomuzavitix.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/50736184888.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/lafenetesevelimetuvezi.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/24696659068.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/17699086914.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/jiraxid.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/lewaditukunel.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/91384030240.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/11047228658.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/56677628487.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/258005107.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/womigasajijidax.pdfIn PDF document text
    • http://briztravel.com/upload/files/kegaf.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/32334151100.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/gakatabu.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/vojaxuvukizobita.pdfIn PDF document text
    • https://contabilidadegoncalves.com/fotosempresa/files/11638691831.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/23602589922.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210903_7F33AC8BDAC592E8.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/wilefozojefeg.pdfIn PDF document text
    • http://iphysiology.ru/upload/66109318447.pdfIn PDF document text
    • http://mc-opony.pl/files/file/84613301747.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/58780787806.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001192a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192A 20200 bytes
SHA-256: fbfc24337c1e3c608f49d5ea654991b99fcaf85700e71afb2c7cdcf4b1dd8771
font_01_sfnt_off00014d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D7E 10692 bytes
SHA-256: 2bcc2778a229af694f315192dafc47783d549bf19694df7c72f0f96cc425a3fc

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