Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c972c5006d52154…

MALICIOUS

PDF

83.3 KB Created: 2021-09-13 03:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b763cc1a8f820d1ee79086929dd576dd SHA-1: 4bc6bf7ecc69461e888f1d4bc3edfb832b9f4d59 SHA-256: 0c972c5006d521544ee20fcdd37d0cadc00f393268d303f08f6b9a3e3a75a204
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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 https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/81756943760.pdf In PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/34916837671.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/norujelufasefore.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/wulenufubovimasonom.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/dufijulisudosewi.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/8234f5059e3591e2df72cec0a944dceb/25918270197.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/wuwupe.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/98101888323.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/71270882497.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/gugexikijope.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/jimanipiwetejoku.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/43695156369.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/46749027002.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/63624024713.pdfIn PDF document text
    • http://zaiger.ru/img/file/liduxagakap.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/3834509498.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/90884500310.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109112154097181.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/56359930073.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/38331782755.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/565427315.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/47379516221.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/80434001514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=flashlight+app+no+adsPDF link annotation
    • https://easyown.ddproperty.com/datas/files/68745117094.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_off0000e31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31C 10416 bytes
SHA-256: 8834aa2900e6225e9eed199e8e51491a05555ab7c99105cd6112d39a08c18202
font_01_sfnt_off0000fa5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5A 17532 bytes
SHA-256: d4b3941f8b5ab57975842f34dda01b05743a43623bf351401e27e4f48311a3b6
font_02_sfnt_off000127bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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