Malicious PDF — malware analysis report

Static analysis result for SHA-256 4248c6b29ec628f6…

MALICIOUS

PDF

79.7 KB Created: 2021-09-23 13:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d792358714591bdfd01799a03041dc23 SHA-1: 9ceb900eb805900c81a7a21a7bc2b8fcd8a9236d SHA-256: 4248c6b29ec628f6c61c53c0edd7c17fd0ea183baba76e445ae0906b8664dcd9
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, potentially leveraging JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6964

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 http://botaierpharm.com/upload/files/92577558711.pdf In PDF document text
    • http://hangnhatbanonline.com/upload/files/33597445697.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17040571798.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/koxoponugujipux.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/nexetogesugatuzekuvuxowox.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/64117793841.pdfIn PDF document text
    • https://healthresearchinstitute.net/userfiles/file/74835006935.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/zidiwivobukawa.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161475cc4b93a1---rumuwedinajazutuvusal.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/64569013379.pdfIn PDF document text
    • http://techbis.pl/files/file/42336907815.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/89993744815.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/xovamup.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161498813c8e63---zitomu.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/7557026228.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/68507748845.pdfIn PDF document text
    • http://mebco.ru/images/file/75727900833.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/fomejezasi.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/67824448407.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/73646976300.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/naxeroxufepidotidefu.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/tisenekexino.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/73946186631.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/jomewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+cite+apa+picture+from+a+websitePDF link annotation
    • 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_off0000e327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3E 10808 bytes
SHA-256: 43589874cb864c65181bf80e9d7006422592a5306b3989600c7d17705cbd01c5
font_02_sfnt_off0001140b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140B 17848 bytes
SHA-256: a2d370de50c85723457ff5edbe9f1fa1e6e6bdf03292bc7e27ea5ca50420552a

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