Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b525f728c3acb7…

MALICIOUS

PDF

75.3 KB Created: 2021-09-09 13:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 7ddf3bf93242edc936b4b3ca68321102 SHA-1: 3e2959175a902acd7ec6a7499e61126d4af41096 SHA-256: b6b525f728c3acb793300a2a27ba0702c9b965556073dc4db5ab301156526a24
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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
  • 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://justsayhi365.com/uploads/file/90692939682.pdf In PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/17241122486.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318c269d661---lumiguvazewem.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/72357678137.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/veget.pdfIn PDF document text
    • https://gulamanis.com/contents/files/gadokedipovotuzipu.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/43171501754.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/rugafawagebojixax.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/riberofuzezutefajewoj.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/buparajoguwox.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/sifime.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613607e824555---xifub.pdfIn PDF document text
    • http://favorit.pl/userfiles/file/tajag.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/30805742026.pdfIn PDF document text
    • https://citronel.com/userfiles/files/11680172892.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/84059817224.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/58992508247.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/64515241669.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/2491246046.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/75954850239.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/20219917626.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/74497993083.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/20913356980.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/makutabijebafurid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=saving+image+and+text+into+sqlite+databasePDF 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_off0000bf76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD788 17916 bytes
SHA-256: 5cbc0ee76b01f01cbdaffbac74cb10f0f4a27cd4fefd591223caec422db7e615
font_02_sfnt_off00010670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10670 11020 bytes
SHA-256: 0488f4d3a84c8ea5717924edf14b0496023e7002713aa77111e054e0e4c5cd15

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