Malicious PDF — malware analysis report

Static analysis result for SHA-256 569970bac223901d…

MALICIOUS

PDF

79.9 KB Created: 2021-09-18 19:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: daf55bf0f744b8c2bfcbd8f241f328c8 SHA-1: 5143a8b4889705bc22473d67e9cf883719c4a567 SHA-256: 569970bac223901df123a4455569be60a42cacd31c401565c10b44cc063172cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common phishing lure, likely aiming to redirect users to download malicious content or submit credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=nba2k20+apk+download
    • http://punaide.com/userfiles/files/sawidud.pdf
    • http://pronobile.com/catalog/file/xupavikaxovofevip.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/458a03d2a88783f56eb802edf3b5dd80/gejedudomiwarulunosoj.pdf
    • https://vientangluc.com/upload/files/6629424418.pdf
    • http://mastervin.ru/files/file/pudusezikametezu.pdf
    • http://kleinschaden-expert.de/userfiles/file/70153065022.pdf
    • http://trustarshida.co/cache/fck_files/file/23496227837.pdf
    • http://sp2wronki.pl/fotki/fotki/file/61168704360.pdf
    • https://xuanhongkhang.com/upload/files/wuditimimagibafosowadeki.pdf
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/rifixakinijubumaza.pdf
    • http://skinct.com/upload_file/file/Fl202109020554171370.pdf
    • https://piauiaqui.com/ckfinder/files/3906016412.pdf
    • http://yokohama-model.com/userfiles/files/xulugibi.pdf
    • https://fond.ru/userfiles/file/44813601724.pdf
    • https://guclupin.com/calisma2/files/uploads/bimulix.pdf
    • http://kerrya.com/ckfinder/userfiles/files/84971178290.pdf
    • https://hanedantoptan.com/upload/files/kekuzalumaxorapojapi.pdf
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/pamemefaxisolidijoneguwij.pdf
    • http://koreaseowon.com/ckupload/files/22637622768.pdf
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/83827716577.pdf
    • http://www.aamuhsv-madisonalumni.org/files/files/22430296037.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/338def291a405878d0ca4a16da8f2635/53130028697.pdf
    • http://shuimotongyuan.com/userfiles/file/lokuveli.pdf
    • https://cauthinh.com/luutru/files/82682581310.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d48e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD48E 16792 bytes
font_01_sfnt_off0000eca5.bin
aa889fdc1eeea9f54cdba2253c538bec14b2deb8cdd5c5975b8e591e0950265d
pdf-font-stream PDF embedded font (sfnt) at offset 0xECA5 10332 bytes
font_02_sfnt_off000103e3.bin
a72ead90a46fe2cab60389eff5ed9bfe96534c2caabcffccb3cc5527b56a7bf9
pdf-font-stream PDF embedded font (sfnt) at offset 0x103E3 17868 bytes