Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc5751f70c1e098…

MALICIOUS

PDF

70.4 KB Created: 2021-10-03 16:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 760d7ccbf8ca83abc1a0e66830e6e777 SHA-1: 00df904087e98a8675b400a7aa87b772f5fc7891 SHA-256: 8bc5751f70c1e09860b0a2dfd5a84d13647ddf32cb9bd3a6d99610fd0c880798
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains numerous embedded URLs, many pointing to potentially disposable hosting, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://salvatoredivilio.it/userfiles/file/8838318304.pdf In PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbf9ac821c---petibugatuwodexefotagune.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/4303562609.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/43920641713.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/33864e11ef52446eae40686995233eb9/kawerimixexe.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/43811803999.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/refesibavuroteteza.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/32538821521.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/mamemejofokidoniliruputa.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/wisiverawafidojotaj.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/putoxodemef.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210914135608_484705924.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/koxerizokinunakupan.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/xatuniwolike.pdfIn PDF document text
    • https://moolans.com/uploads/files/31878938807.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/78743052484.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/45458073291.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/83274525431.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/gidowaruwilazit.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/66310520327.pdfIn PDF document text
    • https://anaksemut.com/contents/files/bimeramirajukeroditod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=other+words+for+imageryPDF 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_off0000b068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB068 16548 bytes
SHA-256: ba7264b34faf36925d0d018fac720bb3323a7d60ddd54efb600843c759e3a776
font_01_sfnt_off0000db04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 10876 bytes
SHA-256: ecf402fc566956b7d0ed68bb3b9cd927da45015d7b7065ad927a3d4a0cf35d5b