Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ad941251a56678…

MALICIOUS

PDF

77.3 KB Created: 2021-09-18 05:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: de811f2f19fd6b169785567d121e7b70 SHA-1: 878c05c8bb35a4f1dfb0a1e86ef560ec9de34d12 SHA-256: 64ad941251a566786f7763b700abbb73dac8a05a7d219766a464a4ac08b7ce78
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one specifically pointing to a URL containing 'how to get 200 free robux', suggesting a lure for potentially malicious content or phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple PDF files, reinforcing the malicious intent. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=how+to+get+200+free+robux PDF link annotation
    • http://ginzaramen.us/uploads/files/25852837225.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/37197674286.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b76ca5ab15---36700939369.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/jadexaxedun.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/gakerisajofivivego.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/05/kixukenumad.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/pimomamirovuve.pdfIn PDF document text
    • https://serka.com/serka/upload/files/newivukoburob.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/eg52h6b7ldhe6kujoaem422k72/zuwiketewuvelizevu.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/borisol.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/2472480804.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/48650813495.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/guwuxozefazobogegedopo.pdfIn PDF document text
    • https://12shio3.com/contents/files/55096756351.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/59214212196.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/29576195866.pdfIn PDF document text
    • http://dsfly.com/uploads/files/gekadowulolisit.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/44266612120.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/86123353157.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/19732069171.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/tipibifoxadi.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/45324605946.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/36800379937.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_off0000ca84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA84 17588 bytes
SHA-256: 3ed4ff116532ff095c3a577aba69db1fa54c41c6005595e75c970b2a40485dd9
font_01_sfnt_off0000f7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B8 10476 bytes
SHA-256: 35c968fdbfa95ae87c9aa0443ccc57fb1d32ff358634e80f460166bcda283186
font_02_sfnt_off00010fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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