Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5f2ad7cc80fadd…

MALICIOUS

PDF

78.0 KB Created: 2021-09-12 01:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ee8895f2685797e7a4e2a5f6eaba76c SHA-1: f1b8bd7f40c7ff6baced9e2a06654f32bc7b9755 SHA-256: 9b5f2ad7cc80fadd3384aa55e98eebf7a4ffb43b9f494f6288685ebf88d6a053
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is a link farm on disposable hosting, with many distinct hosts, suggesting a distribution or phishing campaign. While no scripts were extracted, the presence of numerous unknown URLs points to a potential download or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nvsrolko.org/ckfinder/userfiles/files/10056609275.pdf
    • https://www.scmsgroup.org/ckfinder/userfiles/files/67302491741.pdf
    • http://nguyenxuanhuong.com/upload/files/39977121115.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/65873905041.pdf
    • http://taxicityplus.ru/userfiles/file/toduwelufidu.pdf
    • https://fallsplat.se/bildbank/file/lasugiriwedofurazuv.pdf
    • http://lovesenergy.com/file/14407382316.pdf
    • http://romento.com/uploaded_files/userfiles/files/1383692338.pdf
    • https://itchanoi.vn/uploads/news_file/bexabafize.pdf
    • http://nuestratierrapremios.com/campannas/file/mirorizozonerivajifulus.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16138bfb314524---91722554201.pdf
    • http://sanraimundo.cl/dyn/uploads/file/20540503002.pdf
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/nudasizuxajototu.pdf
    • https://cobrawire.com/userfiles/files/20524357728.pdf
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/92154794061.pdf
    • http://thebodyclubonline.com/userfiles/file/94280091286.pdf
    • http://getsolarny.com/userfiles/file/87171889704.pdf
    • http://gzperson.com/uploadfile/files/dupolorerawatated.pdf
    • http://ryukatsu.com/userData/board/file/16107793333.pdf
    • http://bibliotekaszamocin.pl/img/upload/files/manujulevodaravigubufuvi.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/remipivevamijikaxamujaruv.pdf
    • http://sntaviator.ru/ckfinder/userfiles/files/kitunalij.pdf
    • http://capri.lt/userfiles/files/muberesipaxukiserejivuw.pdf
    • http://riversedgefm.com/files/file/82230403189.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+open+forgot+pin+lock+in+android
    • 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_off0000cb1c.bin
9ba1e1899ba9b1772b04790df2e79a2ce1f0f97b75bf4bb6798fef742a1fd5a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1C 17816 bytes
font_01_sfnt_off0000f949.bin
017c1085dc39037085caf33b1d3629e5868337fed7effe69c5d7ab4064c6020a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF949 10796 bytes
font_02_sfnt_off0001121a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1121A 16792 bytes

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