Malicious PDF — malware analysis report

Static analysis result for SHA-256 54198af990c6fef5…

MALICIOUS

PDF

77.4 KB Created: 2021-09-17 18:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 34e50bd353f1e0a9af177fee7c25c375 SHA-1: 470d4f231b8e365d67c0fafa9069558545beff18 SHA-256: 54198af990c6fef5b20330687feddbca634a535bdeb0765c54671e4e34d69ad5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which are structured to appear as download links for various files, including software. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://yummyschool.com/_UploadFile/Images/file/kipoguduvolezo.pdf In PDF document text
    • http://mp-journal.com/media/file/9796560120.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/terofedasikotevujej.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a70509e27---sofotogusedoxadukadisove.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210916_987612FF1C6024BA.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/xodawimilefujije.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/fudofarodezid.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/95256425482.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/gebubaradesibe.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/24212089531.pdfIn PDF document text
    • http://imoroz.by/upload/file/tudotemanevakabarilal.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/saribuwubopojubuxinevuwi.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/rijazuvewolizima.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/didimukise.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/mupunawegamakanizonivip.pdfIn PDF document text
    • https://anakmeong.com/contents/files/fenulijop.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/tovugidikix.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/benesu.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131cfa024c0d---fepijofuxanat.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/pimow.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/249015838.pdfIn PDF document text
    • http://risme.vn/files/52262007312.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/73408042982.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210911223035_2wkkvg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=download+dream+league+2019+for+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_off0000c841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC841 17876 bytes
SHA-256: 7928df684be274eb74a59b7d1c70ee41ddc95e5d4443c551cf7903540a5f878d
font_01_sfnt_off0000f697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF697 11080 bytes
SHA-256: 6f3b643447c4cc3c5613853b567ed105369abfbc0e9d16399a7c2542b28e1ef0
font_02_sfnt_off00011051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11051 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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