Malicious PDF — malware analysis report

Static analysis result for SHA-256 6990bfb489583e0e…

MALICIOUS

PDF

71.2 KB Created: 2021-09-20 22:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 18e9eaad129340b936bd3be7e75d7375 SHA-1: 9497d24fa835fe981165f52dcd137413a24e2cff SHA-256: 6990bfb489583e0e21bdcd7ef8dbb2ec5f54008602843bc425a7d024c010be16
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous external URLs indicate a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=use+usb+tethering+windows+10 PDF link annotation
    • https://foundationkuzmanov.com/files/sidalitum.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/xevesijidijogovo.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/tanimipeto.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/41918013595.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/9574814289.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/dejegaxeju.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/nesuvomapeluvoweleb.pdfIn PDF document text
    • http://www.programasaudetotal.com/arquivos/file/13392873202.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/xuwuzakimisiporuri.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/72623361509.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/43794700754.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210904/file/16306885315582.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/kafaw.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/44671658495.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/64311871264.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/94800745875.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613498647ae23---96162616748.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/21329735862.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/ravenuxumure.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/lobumixu.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/10018987077.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea596e4d5a---zudigosafunozebaxit.pdfIn PDF document text
    • http://odumakus.com/uploads/files/zawojuwukuxoporotanib.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/51800660257.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_off0000b7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C3 15152 bytes
SHA-256: 706a9f84a5466769da8ee60ddf201fdb33b2f1d69f19a38914e5a2272dcd4813
font_01_sfnt_off0000de37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64E 10828 bytes
SHA-256: 90967ba012ffbab9763f2e48c0eb67803cee81a4a5923d06e6304a5ea4c1d800

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