Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ea78e2e1a405fa…

MALICIOUS

PDF

71.7 KB Created: 2021-09-28 09:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c2f460d9ce846a7fca5b3101e0c1c842 SHA-1: 71606ba5ee9cac19773266015391d0dbb19842b2 SHA-256: c6ea78e2e1a405fadf0f3b8ed08fc30c3ced50f7091989c185635686a5dc0bc0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=xmodgames+for+android PDF link annotation
    • https://pastravariaizvoarelebratiei.ro/images/file/44651238046.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/lawuxasogivakojoka.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/57678471803.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/44327070838.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/nikoga.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/26629094814.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/95732438055.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/1779640039.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/47733955811.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/jovivi.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/39052678680.pdfIn PDF document text
    • http://veitali.com/upload/files/53327792555.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/90938736242.pdfIn PDF document text
    • http://rayanchem.com/d/files/rurumedafikaribofevebu.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/76674679655.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/wufemonagexutiz.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/11091255952.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/jusetinopowo.pdfIn PDF document text
    • http://epmachine.ru/d/files/pabimamizuwalefabinajaz.pdfIn PDF document text
    • http://cochemical.com/upload/files/14938990051.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/5751021533.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e09a4084ea---65320775635.pdfIn PDF document text
    • https://avflash.nl/upload/files/75484462261.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/jojapabezomex.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/78116721727.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_off0000b412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB412 17708 bytes
SHA-256: d9729d7fd352992c1e401d9bcc3e5bd33a002633d5e6904523c79b372d339ab1
font_01_sfnt_off0000e1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A6 10560 bytes
SHA-256: a112c3c5b25c557156e9869b984a6a3a91814fc431ffb3d260b683e5c669e99d
font_02_sfnt_off0000f974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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