Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e4e580daf357da…

MALICIOUS

PDF

86.9 KB Created: 2021-09-11 22:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 118c41aefa4ca7a9e12b70904c6941a5 SHA-1: dbe4275de9743bfe10eb6fa871943a10e6d47aa8 SHA-256: d7e4e580daf357da9679ad4d7b1c83b78e1ccd700a9be2cef4fe81e0e8a89446
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to external PDF files, indicating a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests these links are intended to obscure the true destination or purpose, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ascii.tn/web/cgi/file/91216018446.pdf In PDF document text
    • http://greenworx.eu/images/uploads/files/48454228063.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/zijipotukixokefewo.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021090613071073499.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210908220129_l3usbo.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/36387018264.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/wejewufagetufidopowe.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/66202835378.pdfIn PDF document text
    • http://chromavials.com/d/files/27973961250.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/gototajipumimepoviminox.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/53654080239.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/tejalabex.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/dewesudigufemonijokanas.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/fuguxafasogudezopakanus.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/tesinoweditatawobize.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/79365219399.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/meradexeguzakonip.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613516b63e681---zisikebuxevarov.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/voxit.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/57657076863.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021091017564980554.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/kekem.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/87665156804.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/60129041993.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/zupitob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ragnarok+game+androidPDF 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_off0000f318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF318 10416 bytes
SHA-256: 3e0548be7ea82313ca42388249bfa0dbb5f01acb908ab542186f0999d4cb78d5
font_01_sfnt_off00010a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12281 16800 bytes
SHA-256: 33252c21999b29c7ff5efe6137fd99ec3a71a51d99bc5a576372e58f6d9ed122

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