Malicious PDF — malware analysis report

Static analysis result for SHA-256 73235791b47c50c1…

MALICIOUS

PDF

85.8 KB Created: 2021-09-17 11:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 477979e14078cc929135075d359f57e7 SHA-1: f926992fdc423c6929f47a28f71e54ce0bf038bd SHA-256: 73235791b47c50c1802378c524f2a1a5cc11851fe326d8a9df17da82704acd81
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://garglob.ru/uplcv?utm_term=windows+7+loader+free PDF link annotation
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/jezisupapepoboto.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/76518100111.pdfIn PDF document text
    • http://lgassociates.in/uploads/matemexadunukoximexo.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/63707552785.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/sapaxamamavode.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/78150324726.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/sufavuzi.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/mopezebi.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/68752138723.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/vavaxamij.pdfIn PDF document text
    • http://markone-tools.com/upload/files/66407749238.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/kekafi.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/vukepuzaposupizepajebi.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/dejakazip.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/xuralu.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/20744184511.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/57309032898.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133bc630a65c---pokusolugimezulaxukefet.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/e0175ffbde40d53f4bf4458c8d22b367/jefanewurobebodadated.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/napodinizemoxalosat.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/37468489063.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/jegetefelasavolum.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/bopamawomazelavop.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///guripe.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/1801154267.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_off0000ed5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5A 17256 bytes
SHA-256: 2b796136d321cef2ddd4c0417f19795d2ed7d6a9f9ba666135770bdfea3966c7
font_01_sfnt_off00011a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3D 10376 bytes
SHA-256: a22a29bafbe16c254a927bacabb5e215499691c63ebc84daed766cf683154a78
font_02_sfnt_off000131e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1