Malicious PDF — malware analysis report

Static analysis result for SHA-256 057b4e0ddd838a57…

MALICIOUS

PDF

62.3 KB Created: 2021-09-17 17:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0d8f594bed793689d9e5251caf27d126 SHA-1: a1890111723a628df78a6c004d2e138af71cfec2 SHA-256: 057b4e0ddd838a578267fe31ae410e6c2feb9edb7d3d2a3839458bb780e73d35
124 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs pointing to distinct, potentially disposable hosts, combined with the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic, strongly suggests a phishing or scam campaign. The document body was unreadable, but the overall structure and heuristic firings indicate a malicious intent to redirect users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7260

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://goldenlinejsc.com/userfiles/file/93932750438.pdf In PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/pemataro.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/gomuxovofuw.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/57592994292.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ebetuli00ee0uehnjotcvn68j5/37616558815.pdfIn PDF document text
    • http://nscenter.cn/upload/files/bulukazazezirevi.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443adc89805---90598103583.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/lodugefezegofed.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/6374122340.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/jogunovikako.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/74440357072.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/kamanop.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/mubabapofatuxog.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/nosin.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/jumoguwepired.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/3071315878.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/muvasamugilumukazusaj.pdfIn PDF document text
    • https://la-klamm.org/Files/files/9781507190.pdfIn PDF document text
    • http://pi-consulting.ch/download/mijijuzawuruzixudozi.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/11102190531.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/dumipafiruwagugezo.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210917161831186.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109070227414271.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/3898013754.pdfIn PDF document text
    • http://potya.com/97143323431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+move+from+sd+card+to+phonePDF 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_off0000d9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EC 10892 bytes
SHA-256: 765df969e7e2bcf3a5002fc0656046e0d1372f01df6423f7162f2dc448b0cf2a