Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df5b1b6c64a1e76…

MALICIOUS

PDF

75.3 KB Created: 2021-09-17 21:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 02e25bfe570d39e0281bb3a143e6c75f SHA-1: 7b4dac3d917b5b044efd429eabb0672238b1168a SHA-256: 6df5b1b6c64a1e7688ea43f83c38dfc3d2748b66d9e8a8507577d8fa1a045c49
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially suspicious domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by indicating a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://mimpishio2.net/contents/files/digilefibuf.pdf
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/29083973029.pdf
    • http://akcompany.vn/uploads/userfiles/file/16124089344.pdf
    • http://na3.it/misc/file/bokenemafid.pdf
    • https://agrando.cz/files/file/toxetevibomujalixeje.pdf
    • https://a2designbg.com/userfiles/file/451171824.pdf
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/rajekiwomumulofufimorupa.pdf
    • http://icoenergia.com/userfiles/files/65961088906.pdf
    • http://thamcohoaian.com/webroot/img/files/39273528306.pdf
    • http://secohthailand.com/file_media/file_image/file/binolezubitegod.pdf
    • http://etkindenetim.com/resimler/files/1258819368.pdf
    • http://i-p-p-c.com/ckfinder/userfiles/files/57052255529.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da07b3fff6---44910444877.pdf
    • http://cu-hinothai.com/ckfinder/userfiles/files/megaxuz.pdf
    • http://ecofincas.net/ckfinder/userfiles/files/99891916808.pdf
    • https://tekmaker.com/upload/files/40927627087.pdf
    • http://topliving.sk/userfiles/file/tibedolejatizedixobip.pdf
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/22920460419.pdf
    • http://busangh.com/attfile/fckimg/file///20210910173256_385078439.pdf
    • http://marathon-gexin.com/Uploadfiles/files/deraganipikelotakilem.pdf
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/mijesukapov.pdf
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/sefabigafarapanu.pdf
    • http://curry-box-deluxe.de/userfiles/file/97147542669.pdf
    • http://signauction.net/userfiles/file/volusajetiloben.pdf
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/e08b4abb0551f59541df7ab506d83e01/potiwelisezegumuf.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=dua+for+parents+in+tamil
    • 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_off0000b79a.bin
5e9b43f0359e7178b7d88cb408835aeb0af363d838f56d8aafa80f9ecdb2a935		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB79A 10620 bytes
font_01_sfnt_off0000cfde.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDE 16792 bytes
font_02_sfnt_off0000e7f0.bin
617c3a1ea8140fdb3edbf0611124eac4d2413e61c3e9615fa31db84588550667		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F0 22476 bytes

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