Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b5e1a7d81fdfa47…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 14:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f065153701c85b849225d66a1ec1e97 SHA-1: 85967f22075802e24c1063ab5568f30e8e63a754 SHA-256: 2b5e1a7d81fdfa47883a264824723a07c7a1502fb47aa85d227c630445208ee9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the structure and URL patterns suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://cellesekorea.com/ckupload/files/68326652919.pdf In PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/1e174ad5231c90073b2da2c664c183b3/59506720827.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/80861949032.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/jovirun.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/wopogo.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/bifilawiwibus.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/xatekotuporanunupawazukad.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/39965819018.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/1372629336.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/sonufuregowibetikibo.pdfIn PDF document text
    • https://avflash.nl/upload/files/xonitikorovum.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/30622470939.pdfIn PDF document text
    • https://wrd13.com/force/file/biwobexed.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/wetavujifu.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a73eaba449---15425838922.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/90502878626.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/finux.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/68682182041.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/bewexokunajifowiwin.pdfIn PDF document text
    • https://solturism.ro/images/file/vulelamojiweg.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/38595422305.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/27095887700.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/pulas.pdfIn PDF document text
    • http://geotersrl.it/file/jawexakugemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=vue+print+pdfPDF link annotation
    • 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_off0000deb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB9 10064 bytes
SHA-256: 64ec42db31bd5cfcfd03864ea3716cef3f770744e237e896d1d0504e7a28f9c8
font_01_sfnt_off0000f532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF532 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D44 17244 bytes
SHA-256: 93b1e53577bd967af202dc94b0c846fd879b02e8644aba56b88b01bf6aeeefe8

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