Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f228e967f7fd9b…

MALICIOUS

PDF

68.2 KB Created: 2021-09-26 01:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f92e60657e48d323e83512c72459560a SHA-1: 2517627aea33a930778ca1ab7fc3196a0b32ac09 SHA-256: e1f228e967f7fd9b8742b59ebf9b861884db126b48d6a3a4b5c77d49ad73e22c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 https://sport-jicin.cz/dokumenty/senutijijuf.pdf
    • http://greenegiving.aboutgiving.net/sites/default/files/editor/file/61563915648.pdf
    • https://avistravel.ro/userfiles/file/mavudovunekefitazilawabax.pdf
    • http://studiospazioambiente.it/userfiles/files/likejezaludomuxod.pdf
    • http://agriturismoilnoceto.com/userfiles/files/37859795359.pdf
    • https://pro-biomed.com/admin/userfiles/file/22829292069.pdf
    • http://eastcoastbiker.de/sites/default/files/file/23668711987.pdf
    • http://gemwishrs.com/ckfinder/stones/files/malegosalafen.pdf
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/xenapaxabopowirebumebimuk.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614eab562c887---marewudipix.pdf
    • http://edallyshop.com/upload/files/90317992146.pdf
    • https://adsbudget.net/userfiles/file/punenikowafugutiwapa.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410637857ad---89898553634.pdf
    • http://kidsjeodo.com/images/files/49331687147.pdf
    • http://hoadon-dientu.net/images/files/vaveloz.pdf
    • https://www.leasing.net.in/ckfinder/userfiles/files/60855363659.pdf
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/jaridovetofufos.pdf
    • http://tw-echen.com/uploads/files/202109160705466240.pdf
    • https://seedomoretravel.com/files/files/22790038131.pdf
    • http://htygroup.com/upload/files/wujul.pdf
    • http://opt-russtd.ru/data_center/upload_pictures/file/44369883561.pdf
    • http://bibliotekaludwin.pl/img/upload/files/7282634920.pdf
    • http://zsdbiopharm.com/upload/files/damixunawukirigas.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ilanthalir+novels+pdf+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_off0000ad43.bin
9b39710e08d9694b93d1970bc4536e38ada386578e1c63a3444442ef5ee65333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD43 14864 bytes
font_01_sfnt_off0000d274.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD274 16792 bytes
font_02_sfnt_off0000ea8b.bin
a3e901e1e9216fa4d6def862824185d91eba810ff2e42e70113adcb80e45c340		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 10700 bytes

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