Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8cca98112c493dc…

MALICIOUS

PDF

71.4 KB Created: 2021-09-27 04:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 36cee325fdcd13372b6f24bd0a93e826 SHA-1: f440875c0ffcb90cffb4536b4e77608334c898bd SHA-256: e8cca98112c493dc2563309312f0c9153fb8e96934f1aacc4eca3d0a68ae9ba3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. The presence of many unknown URLs supports this, as they likely lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ctners.com/ckfinder/userfiles/files/14056495751.pdf In PDF document text
    • http://conblocmanado.com/pics/file/savej.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16147d5f71e7b5---lenovobibu.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/10918276558.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161412d9c84809---menos.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/62161089028.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/13318505375.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/zapanabolefego.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/23927458459.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/xiforegosuxiwoge.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/zevipedotutusotujirapo.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/24163652444.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/buzewusopigix.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/30277257084.pdfIn PDF document text
    • http://floresdeserrezuela.com/aym_image/files/xokokifutujagojuviw.pdfIn PDF document text
    • http://grossbuch.com/upload/file/tagomogapuzomit.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/44841714445.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/53800431386.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/xitoraketolerumijibunoviz.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/42905863644.pdfIn PDF document text
    • http://gnox.vn/upload/files/gituzatusavupepiresuruxab.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/41712474723.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109242206341096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=kodi+alternatives+androidPDF link annotation
    • 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_off0000b47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47D 17380 bytes
SHA-256: e4d124075b2d7c3aba34bc6628f4abdb522a34bf94007701e0e01f5fddce8f51
font_01_sfnt_off0000e0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B5 10300 bytes
SHA-256: 2f9cbe2978aa677f80f35cd1f301b7d45a4bddb008e077f4906cfc46745fe876
font_02_sfnt_off0000f802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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