Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18ade56e1fa870d…

MALICIOUS

PDF

74.8 KB Created: 2021-09-12 08:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8f25d8bc9b278e2e222269681508c2ef SHA-1: 9129c32f869cd309b6ad0b6455ff63895cb5eb65 SHA-256: f18ade56e1fa870da26f187db38c8b9d941e04b3a0c3285cf56110e22a0ea92e
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 it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8530

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://buyyoutubecomments.com/ci/userfiles/files/pikudevofi.pdf In PDF document text
    • http://88cpap.com/userfiles/files/1204947175.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/karawoseja.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/woduxiwasapuri.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/nexemu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16139522c3f572---girabowotaketus.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/kajovajofibadarugifom.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/sazug.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/32592952604.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132f33885d00---97489070486.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/30367743032.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/48209935383.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/xolesozadofexujo.pdfIn PDF document text
    • http://simonide.org/userfiles/file/87144934538.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/morabekufotuvuruti.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/vipafaxubaxuzuxovaze.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/dagutaxuwejoka.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210908214517.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/jatixeliwog.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/vadenipini.pdfIn PDF document text
    • https://windsbs.biz/files/file/nujerituru.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/75943270340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=mistplay+mod+apk+unlimited+gemsPDF link annotation
    • 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_off0000d510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD510 20652 bytes
SHA-256: 5f6a0fe25c10a7ad6508db770d591ad0e224bd97e429226aeb4ea32c4150badf
font_01_sfnt_off00010bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF3 10936 bytes
SHA-256: 94d5aec165783035a9c9544752ac04f4af5c535f197e579fa606a77e0bffc875

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