Malicious PDF — malware analysis report

Static analysis result for SHA-256 162d018a4584e58d…

MALICIOUS

PDF

69.8 KB Created: 2021-10-01 05:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 43457c0dc931e9f8f5f3a891503ec3c2 SHA-1: 49e39d22f518555ccb954610a672084b4fe85481 SHA-256: 162d018a4584e58db01cc27bd4f8c5fd16a29e0312ec9b72c8149888f20db4a1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm structure, and the presence of numerous unknown URLs suggests an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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.thaiahpa.com/flash/files/judefozipuvum.pdf In PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210923_172508.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/sizemebonoxunufaj.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/fibudinenemag.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/6147152378.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/letij.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/kasuxakujoxa.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/71683261605.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/vorivef.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/potejuwaximafano.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210914093636_uc49ex.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/pawimategir.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/19646495471.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/24561263978.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/77425484485.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/63ab27f8c2b1b0822b62104c10e4c91e/toseditinas.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613182f223731---89083695959.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/lepujowe.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/xotewitetijakademun.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/zobatogimopibij.pdfIn PDF document text
    • http://praguetransfer.com/files/file/najexaxafizoxab.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/36696049275.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/gunuzofujivubegama.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/43610302558.pdfIn PDF document text
    • https://subarini.ro/mm/file/32192123590.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=mi+a3+software+updatePDF 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://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_off0000b3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A8 15672 bytes
SHA-256: 9f4703e74af199c88880641807054e23ec4d806c1c4279b6ecb4d39ece500830
font_01_sfnt_off0000dad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD7 10692 bytes
SHA-256: af3a02dfc0cf0e240e81abc6ff2a9f536e388d44291e54e9b34dd11ac14a8746
font_02_sfnt_off0000f3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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