Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fed107a0300fec…

MALICIOUS

PDF

81.9 KB Created: 2021-09-11 13:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2ff15a9e4d5c7457945f2813c21597b1 SHA-1: 5cfcb1007a52ca85fbcf69a1d16425f6b5ffd600 SHA-256: b3fed107a0300fec1a68cd232a286b5adc8d88eb33966e449c442671ba0ddfe3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying a pattern of disposable hosting and link farming.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://maria-galland.ru/files/file/99969385285.pdf In PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/27224201222.pdfIn PDF document text
    • http://17njl.com/userfiles/files/xadodudivazivefeduboke.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/40055667446.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/jukukin.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/wotijorixamufinixupe.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/68492778760.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/43800514342.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/puselus.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gotosafaropijosuwas.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/31361497711.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/97079287572.pdfIn PDF document text
    • https://insp.biz/img/file/10269751336.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/sotubafiralerenelivebi.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/8826726126.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/pifekipixe.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/rekizisurelofenegewetoj.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/devazaxujesofuwixeje.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/39187121586.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/7d2897a7d6e1a2d9d9d83dbd8b833f61/45624019500.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/sajonabotelurelulino.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/mejog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=new+cutting+edge+upper+intermediate+workbook+pdfPDF 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_off0000d230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD230 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA47 11144 bytes
SHA-256: 981de4e462ce0eb239954f8f1da5d4c49a6dd21d5f625f3acc595e595205b454
font_02_sfnt_off000103ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103ED 21000 bytes
SHA-256: a43266f5cf64262374c2c02956cfb622d740e8866e2d0ab4843257dabbfb089b

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