Malicious PDF — malware analysis report

Static analysis result for SHA-256 a007734b24a22e12…

MALICIOUS

PDF

73.0 KB Created: 2021-10-07 14:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: deb295e51b30020413b3931371772a20 SHA-1: 143bf8c368ed684eadea1f7750007e45b48b54ce SHA-256: a007734b24a22e1210e7c3672c4798bd7a7529c0e7ab687d8b50c42f4d56d476
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs pointing to disposable hosting, suggesting it's part of a link farm or phishing campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://queure.ru/uplcv?utm_term=pardoner%27s+tale+questions+and+answers PDF link annotation
    • https://ww150003.linebot.net/upfile/files/20210920123257.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/gefobuwefizumisum.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/retevigo.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/59553503129.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090109344118.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/90065751445.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/mixejagabapevanezejavet.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/taxasozajerizex.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/3569722315.pdfIn PDF document text
    • https://softnettechno.com/sribati/editor/uploadfiles/26302494248.pdfIn PDF document text
    • http://dominant.name/userfiles/file/39414153832.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/dokemefusefixokomi.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/57650677197.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/34897910012.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/zitemali.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161376f1dae56b---lixotevugefafoxuwej.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/nivaj.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/nibimatototebuzuwemud.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/xosojijifivigimofewijuf.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/58713984107.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_off0000bb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD321 17140 bytes
SHA-256: e627da5657d65866ea6f23c5a23694e531d1e224a916e91207c26bac3f54a04c
font_02_sfnt_off0000fe7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7D 10608 bytes
SHA-256: 2e2c885ccd7fde0b38b398634b304b24d5049b9068e5123afbf861155f42898b

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