Malicious PDF — malware analysis report

Static analysis result for SHA-256 17cedaae903048dd…

MALICIOUS

PDF

78.7 KB Created: 2021-09-19 19:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a9a9468474b8c5aec80fb1c6f18f006e SHA-1: a3d152591f078b9607973de2def5cba9e728f0f8 SHA-256: 17cedaae903048dd74d6c98fcefe296e859961112bf1c1361f37798d762ed2fc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable hosting sites, suggesting an attempt to distribute malware. The 'SE_DOWNLOAD_BUTTON' heuristic indicates a lure for users to download content. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://coretry.ru/uplcv?utm_term=modern+chess+openings+pdf+free+download PDF link annotation
    • http://audidalys.lt/ckfinder/userfiles/files/xotub.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/15143883279.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/doxemajusezu.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210906222919.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/64600189086.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/zuwikotufonadawolelur.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/lediresomowi.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/10753733958.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/zomagefejoso.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d883facbd8---67826438832.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/kugewilitenaruzusurisad.pdfIn PDF document text
    • https://clinicscrm.com/img/files/53512809714.pdfIn PDF document text
    • http://geasit.it/userfiles/files/mefutaluv.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/88597003340.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/rajuxuk.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/43322822073.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/23150340138.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/18186652653.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/18435876871.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210918085102.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de52b853a4---lawaditapo.pdfIn PDF document text
    • http://imhang.com/fckeditor/userfiles/image/kosimuzamitifogu.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/bezeluzubedufuludowefo.pdfIn PDF document text
    • 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_off0000cf8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A5 10880 bytes
SHA-256: 96818e045eab9c1abd875a4435905454544dceb2b34a8dd361c8f64fa3c90b00
font_02_sfnt_off00010089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10089 17348 bytes
SHA-256: 157c3554b307752bcafe3fcc8bc591118e82e977fa44d6ed10a05201eaddb2d4

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