Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a838f218ce4ea3d…

MALICIOUS

PDF

82.0 KB Created: 2021-09-09 17:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5e33eb71351de2f6c58c7f6055875196 SHA-1: 134dac5596bd5add41b643c889930e45c1fbc869 SHA-256: 7a838f218ce4ea3dd1acd754a25d5780abb7611cefb1ce56f7138190cd65b4ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to distinct, disposable hosts, suggesting a tactic to obscure malicious destinations. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to potentially harmful 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://huzatfokozo.hu/editor_up/sadikeduw.pdf In PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/99992029668.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/benakefiwepadajivoraboves.pdfIn PDF document text
    • http://shesob.com/file/files/vemisolo.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/nuwaganenurinipidejonewa.pdfIn PDF document text
    • http://geasit.it/userfiles/files/nolibul.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/60075281986.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/jafewoxelorafanemeb.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/19083529828.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/91380549782.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/52977914141.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/fabar.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/88258759502.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/63980853643.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/kotaj.pdfIn PDF document text
    • https://bursac.net/userfiles/file/solelupukob.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/44161356855.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/xeserakekabuguzimuvuzo.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a04f74f4f9---24362973222.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/40082370313.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/40687586334.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/53698475083.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/gipitapobipakugoloz.pdfIn PDF document text
    • http://a-pluset.com/userfiles/podaniraverixobuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+screen+record+on+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_off0000dc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8E 10396 bytes
SHA-256: 70a7c04b7f7e3c12e3edf89b8ddc6b25a7291e0bb84fd14cd9b0f3f4f713cd11
font_01_sfnt_off0000f43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C50 18108 bytes
SHA-256: 817bfaebf0e05b3f4cf786d47758fad8c147953bad639340dabe71f3584cf791

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