Malicious PDF — malware analysis report

Static analysis result for SHA-256 d225336b3cb2840d…

MALICIOUS

PDF

68.3 KB Created: 2021-09-24 06:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ec5e3a12ee2ab18725634333d01d68f0 SHA-1: a747fec4b121d4b26af86202ee962b70b29db644 SHA-256: d225336b3cb2840ddaf2174548013a1c045e25e19b2923938cfd3188152a3690
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a heuristic firing for a link farm, indicating an attempt to redirect users to malicious content. The presence of numerous unknown URLs, many structured as PDF downloads, strongly suggests a phishing or malware distribution scheme. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://noble-program.site/js/ckfinder/userfiles/files/minigipukovun.pdf In PDF document text
    • http://willajarmar.pl/userfiles/file/94752242080.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/83322505855.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/xuvuwegazorepativituwiz.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/bimeledawas.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/61590904384.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/novilutavifekepe.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/91234642637.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/feveramemewu.pdfIn PDF document text
    • https://botroul.be/uploads/19540935894.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109102017598291.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/60119956450.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/zexusulibelax.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/42276101682.pdfIn PDF document text
    • https://msiutilities.net/documents/49949120214.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/31253814762.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/37991263950.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161457295f206d---44044791429.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/rexatugalametalu.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/54445681019.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/novinofafapumaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=download+signal+for+androidPDF 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_off0000af56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF56 14576 bytes
SHA-256: 3e2501ad92147a7195340cbf0e8d4aa1a6d48575221b86f2edca539fb6d0ba8e
font_01_sfnt_off0000d410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD410 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC27 10388 bytes
SHA-256: b9c7f434aa19e994b906f9a23930a621e5d1cd25b6f4bc44d89bc6bb5e66efa6

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