Malicious PDF — malware analysis report

Static analysis result for SHA-256 36273b9a220d73ac…

MALICIOUS

PDF

72.4 KB Created: 2021-09-11 01:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 654283aaf611d2c8ef318f9c50a2e88c SHA-1: a5842c32752871c9638ec908a6d4a2d6c9557e33 SHA-256: 36273b9a220d73ac63178d1f92436d38edafe85e98af6b1c1fd7ff240f055a4e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=cesium+atomic+radius PDF link annotation
    • https://momsgardenfoods.com/ckfinder/userfiles/files/winakorupalud.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/99477429995.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/vewizolozemofizazobi.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/baverefupet.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/nivaxunovigujinogen.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/rapejuji.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/64930803030.pdfIn PDF document text
    • http://signauction.net/userfiles/file/pimadepuparudeg.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/finatesogadogakezamekek.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/dovetixomijomuzafalu.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/leliwi.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135526c2d217---saneruwigob.pdfIn PDF document text
    • https://glozor.com/userfiles/file/92677990197.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/vumivimupidetek.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/1246475474.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/54787375797.pdfIn PDF document text
    • http://mopron.ru/upload/files/33630428447.pdfIn PDF document text
    • http://hk-keber.de/images/file/wosaxasupofabu.pdfIn PDF document text
    • https://tebra.si/userfiles/file/najimipovufomeporakufulaz.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/wijuvugiwedex.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/77276716624.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/1144e1a17cb0f4f54d3ab9aa531e9144/42166254190.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/wodezi.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/duzanitaxekunoseli.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_off0000ba48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25A 16360 bytes
SHA-256: 079cb9a97f295f06ab746c863f6639d11c3902986ed57475e6d98c8030c634de
font_02_sfnt_off0000fc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC45 10512 bytes
SHA-256: 787edf3d063bb5525a5b4085545d6174549b05cae59ef45054c93fb6debe5b1a

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