Malicious PDF — malware analysis report

Static analysis result for SHA-256 18bc33a8b270c104…

MALICIOUS

PDF

92.7 KB Created: 2021-09-18 02:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8858a7632897cb1bae2b510c9e2f870b SHA-1: 2ec20da0c3cd2b90cd3406236098edb9e50828b3 SHA-256: 18bc33a8b270c104c8de0da8ff3496745e172c6587c288c903b787185bc4eb53
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of a link farm with numerous disposable hosts and a deceptive download button suggests a phishing or social engineering attack. Although no scripts were extracted, the PDF structure and embedded URLs point towards a malicious document designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://carrasvilla.es/uploads/files/texazomikizewetaxo.pdf In PDF document text
    • http://moscow-vernisage.com/files/files/62265886740.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/79195226507.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/tutedu.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/kakesirinonemakudakep.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/72331989404.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/17889567657.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/zabexowibikekorekog.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d9dcef47e---93176808073.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/75643016632.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090508350290.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/1473337786.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/83415300828.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/diwogeruferozut.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/bonivoxenegewe.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/jixuvazunesodudo.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/51685528189.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/9e3c0243bcf61d7db4c3bd6113695ee8/67886605385.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/54190850616.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/tinal.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/patoxaj.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/31890787847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=friends+series+with+english+subtitlePDF 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_off000102cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE1 19456 bytes
SHA-256: 74e83beb6cfe5019882488740596b850be6779c8ea36e2405c921c5eaaf03002
font_02_sfnt_off00014dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DCA 10548 bytes
SHA-256: 4a9076a753b2e601642bd2023d72990d89649fca730fb4b34e4a6160a38601fc

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