Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0720e53ade53f10…

MALICIOUS

PDF

82.7 KB Created: 2021-10-05 12:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2f19f96fd7f87960809250c06806b68d SHA-1: 8a1464a3c9fa61d49bf1a7ac2ecb4d09fe05eba0 SHA-256: b0720e53ade53f104288f06faa6b0d645aac604b86c08c6f25a28f9583fdcdca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URLs, many pointing to disposable domains, strongly suggests a phishing or link-farming operation. While no scripts were explicitly extracted, the nature of PDF-based phishing often involves embedded JavaScript to facilitate redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://namhungholdings.com/uploads/ckfinder/files/sazeze.pdf In PDF document text
    • https://kaktutzhit.by/uploads/files/22543904696.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/18486239760.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/75290512259.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/73811927975.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/buburefotega.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/musirejifaf.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/tegara.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/wewaburiredulilemiwoj.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/zajezani.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/nijawedanipogix.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/riromisewafawoxesipa.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/41085073296.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/pixiwegibidisixasaza.pdfIn PDF document text
    • http://elskenecologie.nl/files/71238103753.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-16/20210916101053864875.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210911_8CF200A4DABAA68B.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/94281256925.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/xuwobiwilosuwelibatutumi.pdfIn PDF document text
    • https://sportscientistsviews.ijmsir.com/ckfinder/userfiles/files/96050513659.pdfIn PDF document text
    • http://futiandj.ntgis.com/UploadFile/2021/09/25/file/20210925_110235_182.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/25135448903.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/30777163111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=gerd+and+swallowing+difficultyPDF 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_off0000dae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE1 18992 bytes
SHA-256: 44bf5b66d6bb66c4e5f38e8117069cd3e1a0a9b62dee70e0f9ea4123258bd8e8
font_01_sfnt_off00010b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001237e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237E 10988 bytes
SHA-256: 9904f772e75264b427ada0d253d12149f5553ba863b1a924f09805e6ee2ac255

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