Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c58916d14f7471…

MALICIOUS

PDF

77.9 KB Created: 2021-10-13 12:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3d1ac0ddba75f32661408a9fbdbab890 SHA-1: 4a2d65800d915fc61aff97d8bd551bece60b81cd SHA-256: 54c58916d14f7471b9448f60ef42695baaa6bb4bb4ccfca0be792be78e1ed902
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains or files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://mytekas.com/UserFiles/file/saxosagopelidubelukat.pdf In PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16153e56566003---rofunatalakevogulizufil.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/gemavularebuwabojaxawik.pdfIn PDF document text
    • https://nepoo.ro/app/webroot/files/userfiles/files/2782111390.pdfIn PDF document text
    • https://get.belonnanotservice.ga/away?/wp-content/plugins/formcraft/file-upload/server/content/files/1615df54e01d5a---dixowezenofalazesovuwegik.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/37912495384.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/nikitusutatopasifi.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/tenekagefatuxux.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d3484cbc7---51999366080.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/zetidisobikodelupotidil.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/xugegopedemagapuruzilewab.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/18450953127.pdfIn PDF document text
    • http://ducnhua.com/upload/files/litiguf.pdfIn PDF document text
    • https://arbormaster.us/uploads/files/97588043103.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/38620573798.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/61089861260.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/62784121395.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/23005573955.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/98857296140.pdfIn PDF document text
    • https://domilot.com/uploader/files/99250506376.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210905233334.pdfIn PDF document text
    • http://taxfreepoint.com/file/xodogeparedanibixojesifo.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/83387955732.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/57827709627.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/6Zflnl449io/uplcv?utm_term=woocommerce+product+filter+nulledPDF 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_off0000ca67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA67 10544 bytes
SHA-256: 0210f3d3d93d93d9e34e8323d161c410dd3499edbd53ad7124d8e095994bbc5c
font_01_sfnt_off0000e256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE256 18024 bytes
SHA-256: dc84b82f6276923b0a09e16084a7640b28d633de0518ebc77520a96f7b591bf6
font_02_sfnt_off00011190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11190 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1