Malicious PDF — malware analysis report

Static analysis result for SHA-256 b796531cf53cbe25…

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 04:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eface8cc748902abdec8b7ba318ad56c SHA-1: 760d8d453b8d13d4c2d82ee975b3cf7a42e67766 SHA-256: b796531cf53cbe25c1fc61169e53ca3fe1b0f7464b1cddb122a2128379b7e0c3
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and heuristics indicate it is a callback phishing lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to trick users into contacting a malicious entity, likely for financial gain or credential theft. The presence of numerous distinct PDF links on disposable hosting further supports a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://cmtoolsrental.com/user_img/files/dabubiwoxome.pdf
    • https://smartstone.ca/userfiles/files/46983941606.pdf
    • https://renetravel.ro/images/files/dodotajofusawe.pdf
    • http://sntaviator.ru/ckfinder/userfiles/files/nijeriwebisewosavoten.pdf
    • https://zahrek.com/userfiles/file/16077843022.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/6a0aa0829e3219942a6d4a01c278ce26/81411170111.pdf
    • https://benqmusicworkshop.com/fupload/file/jinutenoxigorat.pdf
    • http://pivotal-technologies.com/userfiles/file/15998848132.pdf
    • http://kcpsystem.com/userData/board/file/61684188291.pdf
    • https://innovativallatgyogyszer.hu/fileok/file/zexatuteteliruve.pdf
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/62897218758.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a0cfd02e5---tovazawonowosapiza.pdf
    • http://irs-messtechnik.at/upload/sixegotifofa.pdf
    • http://cdkkck.com/uploadfile/file/20210906052558.pdf
    • http://regimhotelierbucuresti.com/images/userfiles/38949100287.pdf
    • http://ceramvetro.net/userfiles/file/40805507888.pdf
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/zarurivuxomabix.pdf
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/purenisaz.pdf
    • http://konberdbio.com/upload/files/lefopuzotudojazawa.pdf
    • https://nezrenpin.com/calisma2/files/uploads/73673163379.pdf
    • https://markyatirim.com/resimler/files/176780.pdf
    • https://safecampus.in/cmsCart/upload/file/datal.pdf
    • http://star-transform-moscow.ru/uimg/files/pupavik.pdf
    • http://hansungid.com/userfiles/file/48609526903.pdf
    • http://czechdidgeridoo.com/admin/upload/file/83364796076.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=boruto+dubbed+episode+1
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C1 16792 bytes
font_01_sfnt_off0000f0d3.bin
acd38a42c8b70ec988373464eb922fd08412d9c58eb1f1eabba62183391d0c93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D3 18140 bytes
font_02_sfnt_off00011feb.bin
a1d3eb4bbfc7e8825541ec5a8a85a670cbad5070f6c65363fb9f236a96242e4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEB 10420 bytes

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