Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4436fa84c9bf9d…

MALICIOUS

PDF

79.8 KB Created: 2021-09-19 15:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9e65cc290b20e44a8a3b56ebb5deccec SHA-1: 6cd4c659406df04e23ad96a52481a3b28aaf6f80 SHA-256: 4b4436fa84c9bf9d3f5e2e1a4d18112e92c0a30ad5425305c430a74f638b3ea7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=fifa+18+android+requirements PDF link annotation
    • http://bhk-aindling.com/userfiles/files/fuxovamiva.pdfIn PDF document text
    • http://fxlcd.com/upload/file/mokefopilujegodub.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/18610047060.pdfIn PDF document text
    • https://jck.ro/userfiles/file/tigaxamurisiden.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/sejire.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/74881116716.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/refakizofasobibiribu.pdfIn PDF document text
    • http://maksimetall.ru/files/27434684148.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b925982232---83461624474.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/vuvixelozodoxobepinapoz.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/wowifaloduziro.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/gifubivaxemefuwosem.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/kukolokegufim.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/vemimejaxokelubawot.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/lujexiwomu.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/b2a96a6cb073bfdb429a9594a94d26ee/poxitupomitaj.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/mugapajowaxovafe.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/59119642585.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/91466212919.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/8558007484.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/pusoxamakesobutufabiwiwu.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/68679739387.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/xekekafegafakosok.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/lumujogadavakewixozalufob.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/42200410335.pdfIn PDF document text
    • 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_off0000d3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB9 17032 bytes
SHA-256: 521ae59a02a1957dbd2ad9ac160b018efed91176434d3c47139a3a8a74c2ce3a
font_02_sfnt_off00011801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11801 10952 bytes
SHA-256: 029d8e3fd879d087aec741e60274b6df46103c6336e48895dedb067f4af6889e