Malicious PDF — malware analysis report

Static analysis result for SHA-256 9187a97c04b54b71…

MALICIOUS

PDF

74.9 KB Created: 2021-09-23 14:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3309e07c0acb111b52c5ab281cd073fd SHA-1: 639465720538f529d40a108cd5f8978aea92945f SHA-256: 9187a97c04b54b71e9053576b8826fd48f2506e358f4d18225b7fc9477344686
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to potentially disposable hosting, suggests a phishing or link-farming scheme. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.cenlaenvironmental.com/siteuploads/editorimg/file/wemukatenobe.pdf In PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/jizudexuxabumuv.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/sefeb.pdfIn PDF document text
    • http://webs123.com/userfiles/file/2375064814.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/2782598703.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/56242120585.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2320352519.pdfIn PDF document text
    • http://orlickachata.cz/files/files/vuzuvewategoruvusobokirab.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/nokazinojowizetezumuna.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/wekikezerot.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/3169724920.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/bepuwizonilorawu.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210922015227.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-15/20210915161027653353.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/wavikufokure.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/vazenopisosazirazirafud.pdfIn PDF document text
    • http://artepcb.com/upload/files/serizevodabudisoma.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/67383549836.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/21068174598.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/72340924698.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/87856739153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=new+tom+and+jerry+full+moviePDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/vabodotobene.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_off0000bfb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CD 10820 bytes
SHA-256: 30fcbd107874ff5c72c391dcddadd19dce217d1cf165c6b754284ccc569de337
font_02_sfnt_off0000f0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 17548 bytes
SHA-256: 8ec309906ad28fcfc36bd2f52ac2de072a81f293ddcc91fc14999450616ae1c5