Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49c1368daabf7be…

MALICIOUS

PDF

85.9 KB Created: 2021-09-22 18:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a7a6c0d71e92fe1351988f94b7512398 SHA-1: d3e132802977fce3cd85a21e21482bc2cf01d575 SHA-256: d49c1368daabf7be532e589d02fda066e10790bde8949a597cda173d1f853510
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. The PDF also contains numerous external URIs, many of which point to disposable domains, suggesting a link farm or SEO manipulation attempt. The ML classifier strongly indicates maliciousness, and the presence of JavaScript points to T1059.007. The overall structure and numerous links suggest a spearphishing attachment (T1566.001) designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://travellifeafrica.com/ci/userfiles/files/zabakaxurojumorekabagele.pdf In PDF document text
    • https://rsebolivia.org/userfiles/file/vupiwolerakuxudemimekuri.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/vezuxem.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/28105660019.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/tukowuwumufonabem.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/39889280579.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/19974793383.pdfIn PDF document text
    • http://ccadl.com/files/20210910234625.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/70348072747.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/95419632042.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/48806255643.pdfIn PDF document text
    • https://bak.vn/upload/files/jalumonarasuz.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/4a19bb48af5d1b2f7a17fd9b6c08102d/84309849158.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-21/525c073b1c9aefe85863d97c0f65540a.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/67475604933.pdfIn PDF document text
    • http://koala-al.com/d/files/44065550533.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/sivoxemupezanegevasu.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/15106948148.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/30832222222.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/71302231257.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/79230396876.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/66562084646.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/tuwopivaronumub.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8764943040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+put+music+from+cd+to+android+phonePDF 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_off0000e9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F1 17620 bytes
SHA-256: 042cc0557dcde574e13719e22b6f521857610e9aca54fdc4053507eddd0bb9f3
font_01_sfnt_off00011807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11807 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001301e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301E 11016 bytes
SHA-256: ea4e81a4a5550f7da38e979eb26a2f63ee9ef96cdc1ca253d790f2af06dbfba4