Malicious PDF — malware analysis report

Static analysis result for SHA-256 df923377544c9a4d…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 18:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f786172d969a76b0cbe34668fcc29b46 SHA-1: b8c1dc855fe42eabaab02d0e2cfff27f12f53df5 SHA-256: df923377544c9a4d09dc48d32cb33644f3607267db4120c63b9db7a12ea61a74
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to potentially disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content indicate an attempt to redirect users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.klimavill.com/data/editorfile/67492382199.pdf In PDF document text
    • http://h-n-s.net/userfiles/file/zowejavefukog.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/20514279414.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/lanimer.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/18075713979.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/df772f70d55bb8dbd5f078c7f4f1d6c4/30393626290.pdfIn PDF document text
    • http://arsvet.ru/img/upload/32527896953.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/96923259730.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210921073656.pdfIn PDF document text
    • https://loyd.rs/images/file/42008270514.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/monimekujitupugakife.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/7990167491.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/32889279961.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/43389749023.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/0a8d6a6680324c118b91c14d72313bc2/xivokuveximu.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/67345523354.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/fofiratewukofodunezizel.pdfIn PDF document text
    • http://yongqingtech.com/d/files/37383238607.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/74341885261.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/98332552105.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/bumeximifoduve.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/19809815183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=what+new+version+of+androidPDF 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_off0000b042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB042 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC854 15528 bytes
SHA-256: 699b6eca90e2dd9961f9ca05cd6492e3f5e18c223ba52944904aa122cc489ed5
font_02_sfnt_off0000efbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBF 10552 bytes
SHA-256: 851357f90349c0e716bca9517e11e2cb44209a7cc7497036e0ff229f8051f5e5

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