Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d58f3c5ef8bda7e…

MALICIOUS

PDF

79.5 KB Created: 2021-10-17 09:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 61e6bdbf5549b88d040bd86d7f9e0396 SHA-1: 586b513132cf7803e84352c56191e2e3e419f215 SHA-256: 2d58f3c5ef8bda7e4744dc367191c311db7ab604a0bade8e4ecda5a416518610
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://sakuragiramenandsushi.com/uploads/files/46385867435.pdf In PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/pirugobufisafit.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/48127231002.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/52986668482.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/60302555616.pdfIn PDF document text
    • https://reha.bg/content/upload/file/midamoriruvetujofike.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/81071321929.pdfIn PDF document text
    • http://delve-cr.com/uploads/samikubosizoluvum.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20211012055343.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/30214317158.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/81516835090.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/12389365092.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/3139328666.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/92363723153.pdfIn PDF document text
    • http://schokofontaenen.de/idata/86353931491.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/vesibalolubij.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/22221072331.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202110142149062946.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/94982098000.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/vujodewovurozujatiwanito.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144babc0a58f---gasuvijasamo.pdfIn PDF document text
    • http://evola.it/userfiles/files/89571800603.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/reborimajopilubenenapo.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/17310898369.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/89396881771.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/RhDyTiV0TgQ/uplcv?utm_term=square+root+of+108+by+division+methodPDF 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_off0000cef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF3 17584 bytes
SHA-256: b4a8a3f15294432e9ccb097bb17f18af059d9beb8a96eaf7ed1d6a99ffd0a617
font_01_sfnt_off0000fce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE4 11596 bytes
SHA-256: 3c230a7c4b69249e728172a13cd8785e8c2f7501fb52e0f09b6432190a8fa854
font_02_sfnt_off0001181c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1