Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b542f6a2ebce672…

MALICIOUS

PDF

72.9 KB Created: 2021-09-09 06:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2fdf50c0991b4aa0c7bc8be33b91e74f SHA-1: f192894c6d0364786f39b33005739be521097493 SHA-256: 9b542f6a2ebce672b641f4ce5d5692f48f5decd6d16279f3c256efa32baaf7da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, which is characteristic of link farms used to distribute malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the malicious intent through a large number of distinct, low-reputation hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://empresa-venta.hr/files/26886517151.pdf In PDF document text
    • https://austarpharma.austarchina.com/upload/files/47634994236.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fea6756a2a---62473774295.pdfIn PDF document text
    • http://belst.by/upload/file/93081651594.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210907235738_gy6g1e.pdfIn PDF document text
    • http://talleresjpg.es/img/file/32033456665.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/sijagaf.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/89824828813.pdfIn PDF document text
    • http://agmapure.com/upload/files/godiredazofopemilolizod.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/55122388155.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/78513774370.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613320b70ddf8---35345622382.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/52295173986.pdfIn PDF document text
    • http://telektrans.hu/editor_up/83387467400.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/53758768644.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/36881210672.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/72510097586.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/buzewemibewebigib.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/tupitugijen.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/75768975478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=download+textme+apkPDF 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_off0000b428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB428 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3F 10472 bytes
SHA-256: d8e4897c12f89fbb666fe8434c72adfe88a9cf874ce8221589d6eeb50291cda4
font_02_sfnt_off0000e410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 19552 bytes
SHA-256: 76c08f75871f34d96b84892031b984e6d93fda28921b2fbb239e5f5b3a85b7f3

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