Malicious PDF — malware analysis report

Static analysis result for SHA-256 10e3af56315843db…

MALICIOUS

PDF

80.6 KB Created: 2021-09-11 19:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7f83930357d9a2f3376a7e498e2c1d59 SHA-1: b3c4e465e2f49d459ea7cbfc11c434a488618849 SHA-256: 10e3af56315843dbd694ffe27dfb6ff31c2dc5ba92d4b6e923484a81cf845d87
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable 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 explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://kondicionery-krasnogorsk.ru/upload_picture/file/nizavututamilozinotetis.pdf In PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/68045000803.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/83185957882.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/gupafobukuj.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/ganesesufaxizosito.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/5925794239.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/66549111181.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/9b5542a96ce231b411b975bc5db6ae12/18358159784.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/56438498081.pdfIn PDF document text
    • http://atrsara.ir/resource/files/junowufexaw.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/divelusesubisevebowev.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/96633772395.pdfIn PDF document text
    • https://jss-moms.si/upload/File/7072727033.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/26776465754.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/44593706290.pdfIn PDF document text
    • http://hidramaco.com/files/files/45033283394.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/bavijoxixozijufak.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6871ea7d9---78582491319.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/dujigafigaxekikur.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/40326552624.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/gukonekulosibas.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/45921318279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=z2u+8+ball+poolPDF 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_off0000da04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA04 10080 bytes
SHA-256: 0f4f6ad1774f0e24c46ba71f93ed9dab630791eb462ddae32cecf0b7ed3df493
font_01_sfnt_off0000f06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001087c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087C 17004 bytes
SHA-256: 76ecd70050f3918316d401bec63940bba92653c9622bc25b3d35b1d94679e4ee

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