Malicious PDF — malware analysis report

Static analysis result for SHA-256 b407d4197ab093ab…

MALICIOUS

PDF

84.4 KB Created: 2021-09-12 01:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cdb5c4c1d93272310e2b090cc44d4ce3 SHA-1: 0f6709635cb99ca0ae9b7b5e64d363304d519cb0 SHA-256: b407d4197ab093ab2d0ff3026a60bdd21c576ed62b6544749822b1d176d0b50a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains and acting as link farms, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://archism.ru/uplcv?utm_term=organic+chemistry+class+11+mcq+pdf PDF link annotation
    • https://ketex.com/trcgp/ckfinder/userfiles/files/boxaxaremes.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/71278767503.pdfIn PDF document text
    • http://asid.rw/userfiles/file/futerumedunazuboxuroli.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/72226486801.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/luwikajefazakemegejil.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/diwexaz.pdfIn PDF document text
    • http://mega.kz/media/upload/files/roxotofavaxiwi.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/zilujodam.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/5d9c462f1707e5037856c0e877bae368/xazoja.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/19042887025.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210911022542.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/mafasilotumifaf.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/kigevovu.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/721adbad7e20daa1bb49f5ca55dbdb4e/49189982130.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/64222760993.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210908055945.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/ropikutujejufevadi.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/megizunegefovojobisuteke.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/16315253508.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/wazufuwufiladem.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10030820222.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/55942033176.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_off0000e15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15F 18564 bytes
SHA-256: bc9ecc1f0d878a409476e527f84ca5b99082ec4f9799078f7a7c20c68fa9c825
font_01_sfnt_off00011199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11199 11284 bytes
SHA-256: c92714f223ed13be6e584ed44397545409c4ad74a76b1d925106aa97de7f72b6
font_02_sfnt_off00012b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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