Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e74e6959c0fd50…

MALICIOUS

PDF

61.9 KB Created: 2021-09-23 05:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 91ca7ec2567061e0f6b4d50e2c010290 SHA-1: 0907e854a39ceb5757182ad9454884a94b0a8f94 SHA-256: 73e74e6959c0fd50a8d70158bb4066249bbc383ac2a40b6d33c20dcc99051bb3
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are likely on disposable hosting and used for SEO manipulation, further supporting a malicious intent. No scripts were extracted, but the presence of external URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7942

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://smidgel.ru/uplcv?utm_term=how+to+import+photos+from+android PDF link annotation
    • http://digilit.ir/basefile/digilitir/files/jozirarogezawusis.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/45295982622.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/95973269787.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/8523949298.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/46756842197.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/66342327561420ddd135b1.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134953eae4d6---paxeraxup.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/nofabopuruvofavotoxuvo.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/74637637531.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/31093889883.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/26662346048.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/fogolajimiten.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210909_14AC654CFADAFCAC.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/domikebezudesaje.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/jekosozowudokenu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/labulumavi.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/94303322606.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/bafivokojavatubazuv.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///71337599709.pdfIn PDF document text
    • https://quizai.com/uploads/files/52125765922.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/24876874384.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/1f2c5075e1e43d5360155c055e0e8299/givatutonusuzeripi.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_off0000d5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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