Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f3e610e9f4c1b9c…

MALICIOUS

PDF

78.8 KB Created: 2021-09-15 20:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 41a19f3aa88183e28bce56795dc46020 SHA-1: 72a642c1c1fa53abdd21a946c2079a9673a6def1 SHA-256: 2f3e610e9f4c1b9c24eb87dbd193443dfd973e3ac46124867a51c20eb301a193
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying a link to a raw IP address, suggesting a phishing or redirection attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by indicating the document is a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://malopolskiszlakwinny.pl/upload/File/xuduvuguvibuse.pdf In PDF document text
    • http://esistore.de/userfiles/file/37844791365.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/47169190424.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/89302092367.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/75711871175.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/karovafotav.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/340279188.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/65832485815.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210910_002447.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/77719602596.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/79433380253.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/pikisakexafubobizar.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/rawojarotikagezuvo.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/92809609268.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16131a95bc9fa9---genev.pdfPDF link annotation
    • https://officialbacknumber.com/editor_up/vuvimiju.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/6801304772.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/91018641948.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/81086678258.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/10143925558.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/68978109512.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/jikakasizovijalujet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=best+games+to+play+with+friends+iosPDF 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_off0000cd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD98 17940 bytes
SHA-256: 8e466db24b9dfa649ac5a187e67420484c121d285c482fde334583ca5c45b95a
font_01_sfnt_off0000fba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B7 11200 bytes
SHA-256: ac7d3bdae5bd2e4241016a9278ffcedbe521a92b5e66157264a8bb65633bc145

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