Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d8f8bdc62f1ea9…

MALICIOUS

PDF

88.5 KB Created: 2021-10-07 04:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 11f9e9c4153c450af1bc0b4106521ab1 SHA-1: b0f9d7fd1fa1123fdc721bc8de73c66ee7fc341b SHA-256: 40d8f8bdc62f1ea91a45e4304aed207e039488813ab59ae72555e45412ae9a69
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used to distribute malware or conduct phishing by redirecting users through a network of disposable links. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150368521c37.pdf In PDF document text
    • http://guss-ex.de/uploads/fck/file/pedogotapomera.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/jekelunarifasuxazenofam.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/95439421553.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5b184960d---xosobawodubazaw.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/8390912849.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/xosiz.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/29484802456.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/renazolasemeweso.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/getajuganibegosojujumudi.pdfIn PDF document text
    • http://mfcpavpos.ru/file/44400278017.pdfIn PDF document text
    • http://telektrans.hu/editor_up/wevuvuvikoteninematufu.pdfIn PDF document text
    • http://emaaravm.net/upload/files/77923704857.pdfIn PDF document text
    • http://k1a.ru/images/files/file/33812064431.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7761510130.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/weroxawupow.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/gobise.pdfIn PDF document text
    • https://www.renouer-auxerre.com/ckfinder/userfiles/files/lulupov.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/92702898552.pdfIn PDF document text
    • https://thepainter.asia/upload/files/mamaxajeliveladetagukunox.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/nenumopakepexidepabef.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/82231831913.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20211002181455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=self+recognition+examplePDF 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_off0000f374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF374 10832 bytes
SHA-256: b92bc4964575bf6f0a42342b28797f2a13764b58d76d41153692d39c8e51a805
font_01_sfnt_off00010c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7F 18512 bytes
SHA-256: 5f9c9824e62f5c82a295b762113f0d5aa71bcd10b56baaf6e0b59ffa6d675791
font_02_sfnt_off00013c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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