Malicious PDF — malware analysis report

Static analysis result for SHA-256 593226870e3e6d0a…

MALICIOUS

PDF

74.0 KB Created: 2021-09-12 15:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8a6f1b5b318fdde4f7ba8a2b69a39947 SHA-1: fa4f35de040554844cda745d016a75b034fc9aad SHA-256: 593226870e3e6d0aae62e50eb60476c21c33fab9fadc8282c0cffd4eaf595e86
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm designed for SEO manipulation, likely to host further malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://njxinbell.com/upload/files/fesuzexiweditupotawusuzep.pdf In PDF document text
    • https://apartmani-mestrovic-krk.hr/files/12843795998.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/clkuk2v1ua84mkv7q0g46gjme1/41608590652.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/bemetewopuronazigatadi.pdfIn PDF document text
    • http://splogservice.ru/content/files/doladegiwoz.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/jovate.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/7873756494.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/fifeputadozikesavu.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/jitovidupofo.pdfIn PDF document text
    • http://beijingteye.com/upload/files/jafaminubolero.pdfIn PDF document text
    • https://aromamarketing.md/img/files/lebarukix.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/34999048195.pdfIn PDF document text
    • https://campermagazine.tv/public/file/4961649779.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/19447932006.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/87881269269.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/63958506037.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210905054809493.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/21837027986.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/84130323559.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/zunawufo.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/99100277456.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/81869455462.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/40828987298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=god+of+gems+coc+hack+apk+downloadPDF link annotation
    • 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_off0000c0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90F 15900 bytes
SHA-256: 0f35ff14c2cd9b4a08001fd4f2b9ccee22dd5b17d6f3fa6a16df25ad9247c238
font_02_sfnt_off00010169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10169 10996 bytes
SHA-256: 37f2dbf00880b1de8c5d9fd237681162e8bb7d0eb100df92af32ea7aa8133633

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