Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c577b7f3b5c49f6…

MALICIOUS

PDF

82.7 KB Created: 2021-09-19 06:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5f1bf82dfa1238df60eb04474708dc85 SHA-1: 7eb757a99c3fbb0bcc506900b998358d9ac91cca SHA-256: 7c577b7f3b5c49f6f2ec5ca4409ee772a190b1722a00ac5600ce2d32eec490d3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs to execute code or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious classification.

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://loffoxfitness.mvwebsolution.com/userfiles/files/sujefabo.pdf In PDF document text
    • http://tokstar.com/_UploadFile/Images/file/lejitun.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16143ddda54d43---pixogizu.pdfIn PDF document text
    • https://codecs.ro/images/file/55197383282.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/guxugasutepukevafevite.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/79816d73030da83d5e6911ba9a0f8daa/47121940527.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/9131978672.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/52885468378.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/92328273492.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/lipav.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/60022723785.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/votobiwuziwudorovemotar.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/39566214796.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/4630566712.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/ximatinadejiwameragoduwin.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/xosuvamunulekagovafuta.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e8f86684b---60464062799.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/lasurosixujogimoxete.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/77421897608.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/sewerijatofop.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/lilinu.pdfIn PDF document text
    • http://www.puhito.hu/uploads/78801051333.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/jukimigukagorimoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=shakti+serial+episode+121PDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/4039055913.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_off0000d8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F4 10724 bytes
SHA-256: b2a67667f3dcd7113beccfd74aa0656062a52c385432ff6152babf620d16556a
font_01_sfnt_off0000f1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DA 19056 bytes
SHA-256: b9a690a58a0629b1cfbafde1d983701c1d60bb9ef41476e1586b36ef1dcb227c