Malicious PDF — malware analysis report

Static analysis result for SHA-256 500974e5f08dbe31…

MALICIOUS

PDF

78.8 KB Created: 2021-09-14 03:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8e9defc0e32b63412a2c654375e274f7 SHA-1: 10da5f61c8e0f5d7f9b1c2ac5753cfa8df2c94a8 SHA-256: 500974e5f08dbe312bc88bc9ac17e7d7260a1689462ff581f21f72d0c15ab2e1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to PDF files on disposable or suspicious domains, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further corroborate the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://brlairport.com/images/file/gilonaxifekagevijepekise.pdf In PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613f3e0a5e7cd.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/larojisexodo.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/58296141219.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/tejibetisu.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/75047464399.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/51777865830.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/zonoposeb.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109030357458963.pdfIn PDF document text
    • http://195exim.com/datas/files/99427993749.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210903_C48DE3DF593EF381.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/3893e49152cb3c627b068c2394120dfa.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/76722893943.pdfIn PDF document text
    • http://oasishs.com/uploads/files/20210907_192928.pdfIn PDF document text
    • https://limadelimon.com/images/file/52168305065.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16131d0e8ed0a1---legidewidizujaroko.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/26059208263.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/80307663132.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/96cc5c5022d5b8aab1be48523b963390/jiwufibuturaravonigoxiso.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/pikopupisireki.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/6501974529.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/44792056561.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/18189630600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=google+chrome+app+android+downloadPDF 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_off0000d33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33F 16328 bytes
SHA-256: 15083670bd70a51173bbe36abdec549f7d22492931c2ae852003c290ba35c898
font_01_sfnt_off0000fd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD30 10820 bytes
SHA-256: bfcb9d890165324dd814492b1d61be44ea2565007444e8966b70f1adb025589f
font_02_sfnt_off000115c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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