Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9ebc7e7fb2b44e…

MALICIOUS

PDF

82.9 KB Created: 2021-09-21 06:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 024d5d5575fb28900d4aa46c3365c505 SHA-1: 94f0cafa44ae10bf4edf8ac4052aa7862844d4fd SHA-256: 9b9ebc7e7fb2b44e2a8281a8e6798e7ae01a6c56febbfa1f36c00cd21f4b7546
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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's purpose is to redirect users to a network of disposable domains, likely for SEO spam or to host further malicious content. While no scripts were explicitly extracted, the nature of PDF malware often involves embedded JavaScript for exploitation or redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://biurod9.pl/public/userfiles/file/pexanixapub.pdf In PDF document text
    • https://cambodiadriverservice.com/userfiles/file/jugimarigewidan.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nudevulujuvixejaxijodewak.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/nibuvapurariwibaduju.pdfIn PDF document text
    • http://dothi.info/images/files/70325106040.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/31843028008.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/didoluzupovanaxaraxevobix.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/baxokigivewe.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-9/20210909041956212208.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/74993477208.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/5a1640ad0526c4c4887a49281d2398cd/zetimizin.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/masijufileruk.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/14505252963.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/bigezitotubuje.pdfIn PDF document text
    • http://flomojapan.com/upload/files/27727602764.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/69277087589.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/moep6vg140277o0aclcqqp95el/29216759439.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/32778284255.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/luwuborelinanuzanidukun.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/newakubinevuxesul.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/82473249973.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/20895016172.pdfIn PDF document text
    • http://skolky.info/foto/images/file/dumesolipisavap.pdfIn PDF document text
    • http://www.polni.si/Images/files/17628057319.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/59799205289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=where+are+contacts+stored+on+android+galaxy+s7PDF 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_off0000dd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD51 10908 bytes
SHA-256: 15d8431f795035565cc1b8b9bb1486de36f9f9cc151f506638f4de474fc57ff4
font_01_sfnt_off0000f669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF669 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7B 18284 bytes
SHA-256: 1e1cd4fb49dc02c61deb3294d6a3ef4a5f8672d81690ab1f3164719488aab9dd