Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c0ceb9e0cf9a1d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-21 07:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1af11034e409d8d27d97c04b8d9ff73a SHA-1: 41902e41140d04f8034039d7f943fdbf4f1f668e SHA-256: e8c0ceb9e0cf9a1d7cf5692a203cd0f28d36a35845ee7345d59e61a1115030cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious or unknown domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the document as a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/guxareloxonuvomeba.pdf In PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614825c35c9d0---mibupat.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/ginegakokezamif.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/46485763406.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/36235519685.pdfIn PDF document text
    • http://myphamasia.net/upload/files/90897929085.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/75039054395.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/susoxewewogulejizuzi.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/burivasizipumalevedaj.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/43890933147.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/wenekefagukadozexevinew.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/refezukumofopilebefoda.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/refiduzesakegatu.pdfIn PDF document text
    • http://greenbelt.abwingsmd.com/uploads/files/13059631750.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/nivuzulabexapi.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/fazuwatojegutitotonem.pdfIn PDF document text
    • http://yljczl.com/uploadfile/20210913012608252.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631008337.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109171518389455.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/bivinaxexixomukafewila.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/8261920864.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=fnaf+free+download+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_off0000dad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD8 17884 bytes
SHA-256: 4b04c17707dc8f711db822114cda805467537162de84bd297ef278e827f0b889
font_01_sfnt_off000108ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12106 10144 bytes
SHA-256: 7973d9c6affbefd73df9ac1c80ff4c52e6cf2fb61df9129207269d071b6d82a4

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