Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d6ae4ec601d2d21…

MALICIOUS

PDF

67.9 KB Created: 2021-10-01 09:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3c05909ea8a7badee6a0941d286e421e SHA-1: de9c6aa958678ddd25c0a214e2d226547fd4f1c4 SHA-256: 6d6ae4ec601d2d2121781a33818327b4195eaa447000a2ccf1e280ad4be5b52d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous unknown URLs suggest a link farm designed to redirect users to potentially malicious sites, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly support the malicious nature of this 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://sabagdasarov.ru/upload/file/rexezubowi.pdf In PDF document text
    • https://polandpools.com/contents/files/gixufirejusekajez.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/56863300653.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/97617328312.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/xulorosobozamolaxizozun.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/narobemosuzenokamar.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/6658038133.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/27504927744.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/putokiwoxuvomeduzisitem.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/93250212072.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/8b43f35835ca79b26c052c4d1d1d9795/57868176180.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/8819158009.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/38664785055.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/fumiwewugivivukorivux.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/3428373937.pdfIn PDF document text
    • http://dalaichau.com/files/77731595435.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/26561993764.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/zegolenurotedodexinagu.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/vinofi.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/ditalefemaf.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/mewuwiwedasajexom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=d%26d+character+sheet+form+fillablePDF 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_off0000ae51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE51 16312 bytes
SHA-256: 47f9a554cc1ace1a7f071f760921a927d654704f1b98c3a90d667393af62da9a
font_01_sfnt_off0000d7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE0 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8

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