Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b03549c66117b9…

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 05:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 383f23632707d270d3c071a10782df30 SHA-1: 4a45270820ccdb9180bb361f267bcda78a5bb797 SHA-256: 83b03549c66117b948c1782839d31f5d1ad1ee3c6967b57f24a67baca4311272
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://bjhtdszdh.com/v15/Upload/file/202191649105575.pdf In PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/40260572897.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/galeruxepuzeguvula.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vuzofinebalivekivanarodep.pdfIn PDF document text
    • http://it-hair.com/userfiles/64580451097.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/sumonuxadowaj.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/42993256163.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/19344167241.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/56906827887.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/bolak.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/gexukoz.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/wivufepamabira.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091803052935968.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161312b12053cc---40877544456.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/53195394453.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/608410614.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/19155262785.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/popomunenoruxixulojup.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c4cc63e81---fubomuwunoja.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/faxinegebigoruwekujimi.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/vifafaj.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/13490870777.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/28589214596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=samsung+s7+plus+vs+ipad+proPDF 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_off0000db4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4B 17108 bytes
SHA-256: bd94df6b83b3b1c5ec56da517c77e31e98a69d6004ee5072550ac6e40be65ea1
font_01_sfnt_off000107e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFA 10796 bytes
SHA-256: f15c09d7da8df8f22ac34de5bc3de4b36a1d12fda624fb4e3b2c28abea9a64a9

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