Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6d3c3b658f8d1c7…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 20:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 830ef51c923b1f3c436b292571730846 SHA-1: 2773acf822130cb6f06cc2da7195c20a6d74aa61 SHA-256: e6d3c3b658f8d1c79e623e77bd73f1cd36303f5da0655b620399a81ae66249eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pileki.com/imgup/file/vumip.pdf
    • http://csp.hu/editor_up/12243288258.pdf
    • http://rsport.eu/yonexshop/static/file/regugos.pdf
    • http://cartopack.com/Images/file/jefewo.pdf
    • http://haithuanphat.com/uploads/files/fonirowomejarawovibizakur.pdf
    • https://normec-cm.com/ckfinder/userfiles/files/77143180668.pdf
    • http://acecaalcoy.com/userfiles/file/94077837027.pdf
    • http://firmen-bekleidung.at/userfiles/file/38814619181.pdf
    • https://ekoelprom.pl/public/images/editor/file/risutu.pdf
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90307041745.pdf
    • https://motelandratecuci.ro/userfiles/file/95785680583.pdf
    • https://10glazsikeyrosa.ru/file/49375347617.pdf
    • https://tvmreza.tv/ckfinder/userfiles/files/bedab.pdf
    • http://spain-ex.com/images/blog/file/41130528445.pdf
    • http://chiengthai.com/file_media/file_image/file/nomeruxoxum.pdf
    • http://galaxyjewel.cn/uploadfile/files/xugokuxamewitawenukitovux.pdf
    • http://bet-balance.com/userfiles/file/40495483568.pdf
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/95816119833.pdf
    • http://fantasymusic.it/userfiles/files/79103848198.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130815222fdf---72694927159.pdf
    • http://daejonggyoyc.com/userfiles/file/20210905214909.pdf
    • https://educationindiajournal.org/ckfinder/userfiles/files/vunorurozojivi.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16133dca1aad73---54238373664.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=apk+decompiler+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da91.bin
527ef1c51ab8bf99d23fa1e0f879d710427fe729793abe03af69257577797a70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA91 10672 bytes
font_01_sfnt_off0000f2ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FF 16792 bytes
font_02_sfnt_off00010b11.bin
2a6d84147a17c82eb7faecf69a0aaf3833406fdcc2cd35ffc55315a2faa23b3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B11 19344 bytes

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