Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b4fc1b96fa1dbf…

MALICIOUS

PDF

68.1 KB Created: 2021-09-14 12:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 25adce3257f46b32cf856123cfa2c262 SHA-1: 51db118479e724c5d7991812b884564025901e70 SHA-256: c6b4fc1b96fa1dbf78b0b0494e60477c098f22cc8bdde401f0c963678b102fc1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. It also includes numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting an attempt to distribute or redirect to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://vrieshorst.nl/images/uploads/file/buzozukonu.pdf In PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/48210533558.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/jarudovepimonopok.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109011818066285.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/madidekisejenu.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/77414431491.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/86542373722.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/58015302291.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/13801453256.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/53707064323.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/97568911595.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/80589124691.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/kuluxufaxu.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/xivij.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/98983660944.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/rafubapekop.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/pikesarom.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613905df9c4d3---rofutepesazajime.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/vorisomasukadasememezivez.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/83687594259.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bejofuvarowarejelemu.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/44190428359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=good+and+bad+side+of+social+mediaPDF 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_off0000ae68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE68 10616 bytes
SHA-256: f4d1dd7d6edd6899d7cebdce80b7043022cb2d05d6428e3952416a276a4d0992
font_01_sfnt_off0000c6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A2 14548 bytes
SHA-256: 01c3b8b2c3ec9e7f329212d7ada77aae049655cdfb0f6ba5c09171a1d37f32da
font_02_sfnt_off0000eb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.