Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ca6e2f010609b9…

MALICIOUS

PDF

85.3 KB Created: 2021-10-05 07:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 199b845c72a76d70eaaca5846d4a678b SHA-1: 6c6b40575f38bbf38a6204ec561c81203e447211 SHA-256: b9ca6e2f010609b9bc53910dcff7fcee719e855514c46bba25c9390f23358337
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous PDFs on disposable domains, with a high number of external URIs. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and external links suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://textingrights.com/userfiles/files/36293717442.pdf In PDF document text
    • http://sunwisechem.com/Uploadfiles/files/65305238528.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210902143829_ptp0t9.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/48805225851.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/wabalevavuxivo.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/xewukifumezumosomosuza.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/pufasejobapoduki.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613514ef5a819---gorufubuxuzimebunepegadav.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/17171366737.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/bavofetape.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/50275292550.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/25233943562.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/lujajobulalubure.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/geruxisuku.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/46343844968.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/lowov.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/67231637060.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/figiratukanote.pdfIn PDF document text
    • http://domuran.pl/files/file/9380982602.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/mutukizusinobutaji.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/gakazuwuruzujit.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/zafanone.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/xujeditosujupu.pdfIn PDF document text
    • http://hun777.hu/_user/file/toximiluzabexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=space+trusses+problems+with+solutions+pdfPDF 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_off0000e0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E0 20236 bytes
SHA-256: 0f355a0d9c1d33b360cae9ef5c3545434fea989fa6d36e55f0b3006fe8c9f2e0
font_02_sfnt_off00012cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC0 11284 bytes
SHA-256: e36ce2b54f5075dce06cdb2460a3b746c4369e272963a6e695c8990729672e0d