Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b2b6e090c8564e…

MALICIOUS

PDF

81.6 KB Created: 2021-09-22 13:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2523f0222b3be1fb8c0c1183b5da2c6b SHA-1: 062401e332c371dc20e635b51ce3590910182198 SHA-256: 85b2b6e090c8564eeaee638ec5cb3038e3c6d5bfca73a59eeb6e9207e3b72868
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. This suggests the primary purpose is to redirect users to potentially malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://altinhediyeler.com/calisma2/files/uploads/zemiguzedate.pdf In PDF document text
    • http://hjhchem.com/upload/files/57952913046.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/80252553477.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/sunenotor.pdfIn PDF document text
    • http://jinyezi.cn/upload/83292944480.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/55675521878.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/lafipusasolenesoridapa.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/vozunatetuvuvukinix.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sexakojemijaxozodofo.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/61051643720.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc4bf5cfb5---29311296809.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/95325562392.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/48678740300.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/zoterolofulo.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/babarazeligofobixiwulun.pdfIn PDF document text
    • http://chikatere.com/Upload/files/69920232352.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/09qj7u49v19k5kgcaiu0ur4ra7/giretegad.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/52801904120.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/romikofipefafe.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/75984974766.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/bubiforibul.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/49260507881.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/jexuroxivusebawimidete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=download+instagram+photos+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000d800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 10888 bytes
SHA-256: 608b380d9622d7a205cae7f472de5795a1e0a04068825c98eef0406ab76f41e1
font_02_sfnt_off000108e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E1 18316 bytes
SHA-256: 341f904c7f32ccf4159d72fbf37ad303c7b3e7273b8ad0b3d66290bf2b4873e3

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