Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd033b7cba0e44a…

MALICIOUS

PDF

70.5 KB Created: 2021-10-03 19:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 03a174b1aba51ce577b405fbcce450c1 SHA-1: a6a5386f95ebf51abdccf7fbe111bf7c68b6143e SHA-256: 8bd033b7cba0e44afb166193650bc5071154c6a88ac231ce831ca1af3823cce0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also references numerous external URLs, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://coretry.ru/uplcv?utm_term=how+tall+is+lebron+james+father PDF link annotation
    • https://theptaynam.vn/upload/files/zivokowuj.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/6855329780.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/d7fe06ec986ec7b180bb7e989b934c7e/58716030837.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/7784813541.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/zibato.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/bogoj.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/17341517242.pdfIn PDF document text
    • http://rem-proekt.com/f/file/12540297500.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/xovamoxaxajuzepusovubifib.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/47099871341.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/riwiwugulevibefon.pdfIn PDF document text
    • https://mauspro.net/upload/files/43767817710.pdfIn PDF document text
    • http://medi-sen.com/files/files/vegofozopudafeguwidu.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/kasoxelebubovanadexonez.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/776785941.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/nepuwirizajorik.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/bipupefikujijulike.pdfIn PDF document text
    • http://canvangdientu.com/images/file/goziwelekuduvaj.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/74089352779.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/datamijezokoverevajag.pdfIn PDF document text
    • https://senegal4d.com/contents/files/35309802708.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161558e277fb8d---77361687411.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/28455216225.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_off0000b107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB107 15892 bytes
SHA-256: ff50ab2cfe338b9de88dd996ea3bc5f82e225b71e6ad71cef23150ad72eb3a78
font_01_sfnt_off0000d9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BF 10828 bytes
SHA-256: 2a816bcdcf0115d06c8e73da9e25931610e6f2ace4b9d484e1152181a07747f8
font_02_sfnt_off0000f280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF280 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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