Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ea8299e6a762436…

MALICIOUS

PDF

75.8 KB Created: 2021-09-29 11:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fa7b9ebfee1432d9353e9e6b0efa97cb SHA-1: 82361fc2acd2048683235ce1bd0062a1f0d33b80 SHA-256: 1ea8299e6a76243650ecd0189d7bc8b3de2e0bc1abfbf470778575285b55e04c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs to execute actions. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown URLs indicate a redirection to a link farm, which is often used for phishing or to host further malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://2sisaccount.com/userfiles/files/kurapisuzupuw.pdf In PDF document text
    • http://ghefoot.com/fckeditor_userfiles/file/joxozekilakikekorevik.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/sofuvitogujosovofuvoli.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/sipofutitalan.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/xuzanunu.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/valepadutini.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/2689588226.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/gikelikanomowumowor.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/21342399934.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/diber.pdfIn PDF document text
    • http://all-premium.com/user_file/files/84103855084.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/konusanitapirijasexaz.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/40224189611.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/15305027648.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/xelasuriga.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/sowalin.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/lufudi.pdfIn PDF document text
    • http://oookub.ru/upload/fckeditor/file/vogatekilixi.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/28228556356.pdfIn PDF document text
    • http://bptramptour.pl/files/file/49611890502.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/9288799828.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/65530703487.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/lovujaxovufomisatela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=completing+square+root+methodPDF 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_off0000bf36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD748 18988 bytes
SHA-256: 46d613a2cba17d945aef8461888be91b39ab700730236ee613cafb2e6be99109
font_02_sfnt_off0001085c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085C 11116 bytes
SHA-256: 2966136d5662fe654d51659e8feaa35b1b95a403d805202b18e63b816977b25f

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