Malicious PDF — malware analysis report

Static analysis result for SHA-256 504be3265eed3792…

MALICIOUS

PDF

77.4 KB Created: 2021-09-16 19:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aca189955ad579c36a9dac9ed446ed5e SHA-1: f4a823a3923b79d1180359c228f38df0f21288da SHA-256: 504be3265eed379235980f74e57016508dce74745b33db8f3e70a75c79e1ed69
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to disposable hosting, many of which are part of a link farm designed to obscure the true destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, likely to trick users into downloading malware disguised as legitimate applications. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=download+apk+grand+theft+auto+5 PDF link annotation
    • http://trevorhannant.com/witigemumiron.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/notodulamogoketiwujeza.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/74052711927.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/vabewonameduj.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/14918526576.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///surakaxabudufonuja.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/41077591940.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f5f29e48e167d57fd3df81d12b8aa524/87188926696.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/65996838715.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/timutedika.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/terexevewamujezuxidoboxar.pdfIn PDF document text
    • http://msiutilities.biz/documents/15702040298.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/36313953313.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/90473034777.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/63970897623.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/merexokipuj.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/92929119927.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/1561154276.pdfIn PDF document text
    • https://tsegypt.com/file/95747587491.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/23720102020.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/mewijokapiredetifotiko.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/botesinonavexasi.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_off0000c9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CB 10928 bytes
SHA-256: a88adc5d12e20510d6f0e7e9d2826855e533e9c03876936d312c551eaf46f7b5
font_02_sfnt_off0000faf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF4 17648 bytes
SHA-256: 9d77e8d3320bd9be5a11d6120e49f05ebb52a227b2be975e0af25dceb68ebe59

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