Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d15b818f8b2c5a6…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 18:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0ddca52c712c404764ff2057800eea7f SHA-1: eca2debf4024fd15a386227da5c3a2bc7d1698a1 SHA-256: 1d15b818f8b2c5a6fbda84837e447f284857a49050b0752999f526eab98bd62b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded JavaScript is likely responsible for redirecting the user to one of the listed URLs, which are designed to host malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://allytemp.ru/uplcv?utm_term=ortigas+pasig+zip+code PDF link annotation
    • https://anukulagrotech.com/ci/userfiles/files/roburazotigu.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/96217551904.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/11577472301.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/mofazaridibetobakukajewa.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/91119303830.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/kasemipuzuxapikefako.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109120451589447.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/65791412410.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/66959191301.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/85607181237.pdfIn PDF document text
    • http://js-space.de/userfiles/file/ritaforolanases.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/bijikegijakikoxixovo.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161414198e581f---gerezaw.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/lupatewufedukoxod.pdfIn PDF document text
    • http://ridendo.cz/files/file/45072169614.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/girufob.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/90561303761.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/refuliloronijix.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109100208135648.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/7939321828.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/rozazajivulifil.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/naweli.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/misibipusinuzotadaze.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/rapopikudegojelose.pdfIn PDF document text
    • 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_off0000ded6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6ED 10624 bytes
SHA-256: cd2b04276d52caf540555cca0bf1f14e4c941ea68ce58a74e9af09cc1a953aa7
font_02_sfnt_off00010f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3C 17836 bytes
SHA-256: 0b18310faa53d7681369a3e89fdd8ca67a2e072d7603d78f87302e01d19b31ad

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