Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa725300c5661364…

MALICIOUS

PDF

82.6 KB Created: 2021-09-21 04:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fed61342b2dfa5b127e24abaa89f1ba5 SHA-1: 8ae22a47a6d7a2e4067bb1245fb9ca4ef7e10c89 SHA-256: fa725300c566136476fe4f72b1d3547f1987b2dc0e77edd5044fee9b039c129e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cructi.ru/uplcv?utm_term=smtp+host+office+365 PDF link annotation
    • http://robwalker.net/fckupload/file/36067963336.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/meferosiralidu.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/58567871888.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/31489128711.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/73940137970.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/48075218768.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/78793506725.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/33338646196.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/vutam.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/54567895996.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/genogivegupimanuvigode.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/26880550346.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/66164714943.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/nokixugeje.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/95540644497.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/zijoxuzorenila.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109081253047683.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/jutugixenivok.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/25894609664.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/41173816520.pdfIn PDF document text
    • http://travellerisland.com/files/75076437687.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404a30591ef---35723077807.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/82703328740.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/58968eae35d7f238c69a48320cb4d696/28742988652.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_off0000dc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC96 10884 bytes
SHA-256: 5cf7b20331000e870931b5ec807917e22fa4ae27ff5a539f09a84395d6406684
font_01_sfnt_off0000f5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C7 17956 bytes
SHA-256: 928ad48355215ec03b87295734539bbde8cbb0a8a6f5213d6e2e83489b5d0ce8
font_02_sfnt_off00012543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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