Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcebe2d96a59c00e…

MALICIOUS

PDF

84.3 KB Created: 2021-09-17 04:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4af0d8df954e91f0db1e72d9c5800440 SHA-1: 9ae5c4b86fc2fc457c1097b2279b75f1aa3183f0 SHA-256: fcebe2d96a59c00eb466b186ac683feed4050e522010f84a9080df3ef8e2d8a5
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many pointing to disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the download or execution of a secondary payload, contributing to the overall malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nepalonetours.com/userfiles/files/wukigovazebisuliluvo.pdf In PDF document text
    • http://1qjd.com/upload/files/2021-09-12-21-22-30-LleoHzcb.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/borudapusimudeki.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/81229136597.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/tixexuvu.pdfIn PDF document text
    • http://usagimatur.com/files/others/mumodekebesudise.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/jasuzulijawiwup.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/rizevenopinebi.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/kasepesipenakamojeki.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/wofabipituziwuladezuvise.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-5/20210905150018869275.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/rogubavesijusilulor.pdfIn PDF document text
    • https://go2germany.ru/files/file/19195070919.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/cida507k0uvaapshi64cj41vro/61068968776.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/dijeduwekimafefejalarowox.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/71385558070.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/mozasaxowopugip.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/lezakapi.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kimovasok.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/68370645077.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/72043147495.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/jelidanabuwajob.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/91486649117.pdfIn PDF document text
    • https://negaratoto.com/contents/files/14957843689.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/e9562dd56e91a5ca8f7770640cde8f37/lefezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=sarileru+neekevvaru+full+movie+download+in+tamil+dubbedPDF 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_off0000e40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40C 17692 bytes
SHA-256: 8038c52016ac38f858eb241c26e96ae148e3a6148acc006057efa2bcb13e4bc3
font_01_sfnt_off00011154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001296b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296B 10904 bytes
SHA-256: 5b1e1abf21d36e2dcbfc9ed740391d93714d0ea5370a663e1b6ba65c3f44f14b

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