Malicious PDF — malware analysis report

Static analysis result for SHA-256 558db1c02df6b7ac…

MALICIOUS

PDF

83.7 KB Created: 2021-09-10 13:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 38591a6e48e61f809af00ce74c68dfa8 SHA-1: 2d2fb48165ebfef2279031bd0796763e95565c8e SHA-256: 558db1c02df6b7acbc5eb3b54b09dcaa1f50e76f14196c1929c9901d00214342
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs and a heuristic indicating a link farm suggests a phishing or malware distribution attempt. The heuristic 'SE_SECURITY_BYPASS' indicates the document likely instructs the user to disable security software, a common tactic in malicious documents to facilitate further compromise. No scripts were extracted, but the overall structure and heuristic firings point to a malicious document designed to lure users into a compromised state.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/25035594219.pdf In PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363c5b838b1---93183226770.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/godaxoriwufowizumaruzitef.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/leruwo.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec07c9d68a---zupakasujo.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/34625673784.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/40062949855.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/43099802896.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/lajenejuwowugafigaga.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/7499322988.pdfIn PDF document text
    • http://didula.ru/img/file/potozozijuwas.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/topazudasowagavokopatimif.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/17370682514.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/meruwuro.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/lepabuvufewi.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/60941657414.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/zagunalemobelajofebejina.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/51765006507.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/jukinajironewuboganena.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/60225831332.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109090631583880.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/68984155033.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/74759129759.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/dagaminumisesiwefasef.pdfIn PDF document text
    • http://gptools.net/userfiles/file/83191827599.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/jodujafinel.pdfIn PDF document text
    • http://www.moyekolodin.com/files/wajitafadoti.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/55793581311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=mutilate+a+doll+2+download+2021PDF 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_off0000deaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAF 10448 bytes
SHA-256: 3126176bfbf33c08cd9ce7914e3bedd052fa5f178062bbda87e4a5f41a88c6f4
font_01_sfnt_off0000f69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAE 19256 bytes
SHA-256: 033d8cb93b0c36096647527c26a4b6b239a9d6e8e261d8310383d26f5b490f1f

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