Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c5a4fd99799d91…

MALICIOUS

PDF

83.2 KB Created: 2021-09-10 18:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d720a3a82064bad112e4a0663457a382 SHA-1: e77ffd63f0ab2ff40546e9ee7c7cfc4f3024cab3 SHA-256: a1c5a4fd99799d91ab3e07c46049eb056b54e9060fc8b1afffab2e877ada4ffc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to unknown or potentially malicious domains, indicative of a phishing or link-farming scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to distribute malware or phish users. While no scripts were explicitly extracted, the ML classifier and ClamAV detection indicate malicious intent, likely involving the exploitation of PDF vulnerabilities or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://jpsacademy.com/slbdavbatala/userfiles/file/jepenedumaposaki.pdf In PDF document text
    • https://rintrans.com/files/52772151620.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/jimovezivifedu.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/jevezamebuvovupo.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/87036107677.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/sujuruxagep.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/zajak.pdfIn PDF document text
    • http://domuran.pl/files/file/24917295635.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/19066011581.pdfIn PDF document text
    • https://tpk-m.ru/files/file/duvokerod.pdfIn PDF document text
    • http://labonscafe.com/userfiles/34362693200.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7c7ccd622---77574005399.pdfIn PDF document text
    • http://ministerium.pt/files/bosekanudiwe.pdfIn PDF document text
    • https://kokomanis.com/contents/files/77169720737.pdfIn PDF document text
    • http://sakem.org/userfiles/files/gadagima.pdfIn PDF document text
    • http://xhzhengli.com/upload/dikifetegozamo.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/59850040092.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/warigid.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/30198135503.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/timexuvo.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/josuvogekawebudegagatet.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b03f230e68---14763703435.pdfIn PDF document text
    • https://arendic.cl/files/53717209056.pdfIn PDF document text
    • https://cartolmania.it/file/sedilebok.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/36295978296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=smtp+server+for+office+365+emailPDF 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_off0000de3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF651 18120 bytes
SHA-256: 5d1b8275037e9954c75441506a2b87563f983d9f0c8afeef8d12c7b97198f374
font_02_sfnt_off00012590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12590 11152 bytes
SHA-256: 307927d80640166d584ed956e253a575e20d405307d62073f8e6679e12869bb1

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