Malicious PDF — malware analysis report

Static analysis result for SHA-256 9295b3eb7985f842…

MALICIOUS

PDF

76.9 KB Created: 2021-09-24 05:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 373476e35308dd722d2eafa354905cfd SHA-1: d0f750370403fd31664aeb794574e2c8120cabd4 SHA-256: 9295b3eb7985f84213500b66f54fb17598812c7ac9e33a35ea5e399d23346d21
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious actions within documents. The heuristic firings and numerous extracted URLs indicate that this script is likely designed to redirect the user to external sites, potentially for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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 https://medvor.ru/uplcv?utm_term=grimoire+book+of+shadows+pdf PDF link annotation
    • http://cabini.it/userfiles/files/torifijemoxofi.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/79549539413.pdfIn PDF document text
    • http://snkpost.com/fckedit_file/file///20210921_3_5_13.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/ludukoxukesisedolowupe.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/85572874360.pdfIn PDF document text
    • http://unsersohn.ch/images/file/kofawuwibitigiwif.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/mapokuxuv.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6ed8d7d65---87449052904.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/80229615993.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/13346049229.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/nexotanale.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-22/20210922225045860175.pdfIn PDF document text
    • http://12shio5.com/contents/files/nobuzuduzeverip.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/novilipexo.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/resipagubozebifaxuvawu.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/xunuwefijak.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/44513440044.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/kenawanufufabax.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109120910225251.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091413471174.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/tusibagigujedazuvifuposo.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/garer.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/zigekawewetewifabaridezob.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6dda122bc---29646992180.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/38416413651.pdfIn PDF document text
    • 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_off0000c92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92C 10872 bytes
SHA-256: ba635fbf53f87b796db1a7278cb2053b534972237cd1b6a633e778662590620b
font_01_sfnt_off0000e228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE228 16900 bytes
SHA-256: 3792f81760e610e243a7599d4e32a630d5b274f72d8df30d918b0b6d4039429d
font_02_sfnt_off00010d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1