Malicious PDF — malware analysis report

Static analysis result for SHA-256 3862917bcd45b02b…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 00:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 312e105f4c41d06ba52d6e8bcc516e6e SHA-1: 309ad429f7d4da592d207172af196544f340b0e4 SHA-256: 3862917bcd45b02bd88a56294d9e0b048e8f8f44e2143263f4042c0d2a21cbf3
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. The 'SE_CLICKFIX' heuristic indicates social engineering, instructing the user to run a command, which is a common technique for downloading and executing second-stage payloads. Multiple external URLs are present, suggesting potential C2 communication or payload hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.zochrot.org/ckfinder/userfiles/files/mipuragavagabola.pdf In PDF document text
    • http://sromedical.com/file_media/file_image/file/repuganotosemerubiginaz.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/valovo.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/dujiwutanuzulune.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/75114143087.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/surogeparepovukuladaj.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/kezufivomowuxudomiwubov.pdfIn PDF document text
    • http://nusamulticentralestari.com/Uploads/userfiles/files/92325001258.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/lowifuvogepevoxipirijugo.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/mavipegulofagejepi.pdfIn PDF document text
    • http://www.ghidmariaj.ro/app/webroot/files/ckfinder/userfiles/files/tajago.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/nubobugipugu.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210910110047.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/livividokitu.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/98771273627.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/22212267175.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/94630156812.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/66469824404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=free+minecraft+mobile+serverPDF 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_off0000d986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD986 18736 bytes
SHA-256: 19dde4c6d94c136a7dd8e0143164348e6dc68027f634dd6862ef7a6a41b11405
font_01_sfnt_off000109d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D2 10680 bytes
SHA-256: 6fccc1ff9f5a8b1d160c351329be296c7cb4a33ae7f1cfebb966f1d9d9cfd3ad
font_02_sfnt_off00012253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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