Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56a98eb443eeec0…

MALICIOUS

PDF

76.9 KB Created: 2021-09-09 21:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8f0ffe1d0f309b2a59e39f5b83af6d6d SHA-1: 175005dd7908661ef95dcd12feec6bbfa30b8b80 SHA-256: f56a98eb443eeec0e277fb959a6c8b899462dfa08d5471961851e8be761b556b
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to disposable domains and forming a link farm, strongly suggests a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/sidina.pdf In PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hhed3osv5up3rlat3a1jbpbutq/kotogigotubome.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/gawotaluda.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/61345480959.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210904_035805.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/zokojubosutel.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/vumoxulegaladijatevilusa.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/2416900835.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/87213983398.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/suxatosiwakigefuvera.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/10087643655.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/bodavomitimal.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a26d13547---nenetudufoj.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/lekeg.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/wobipukedej.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/dolagukano.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/kekakokelixigomajoxufepi.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/35142489011.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/26227968649.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/43781335083.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/41120983384.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/labaferejilofejesadesur.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/18753931378.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/26050298852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+do+you+make+a+video+live+wallpaperPDF 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_off0000c524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD36 18584 bytes
SHA-256: 680c9b6b8ca354fcae4c756a6dd6c3561d28eba5e14994cdedf32f80f364958b
font_02_sfnt_off00010d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3B 10632 bytes
SHA-256: 0a58a2733eb5236ec61da54f80fcf4b0a7ef8f2a7168c4d9616c9ad93bd7c17f