Malicious PDF — malware analysis report

Static analysis result for SHA-256 4764c30e1b3d2585…

MALICIOUS

PDF

86.2 KB Created: 2021-10-14 04:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 412349730cc96b367e5bddb41b7b2a24 SHA-1: 8711b5d1e05a55da77424180085d02aa34fb80db SHA-256: 4764c30e1b3d2585d3b698c62d5fc5a0dad31951ceb5cea3e6b863828253dd67
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to disposable domains, suggesting an attempt to obscure the final malicious destination. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document may be instructing the user to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://myarchitect.es/ckfinder/userfiles/files/badanumotoloxasobumo.pdf In PDF document text
    • https://preprodpcb.com/userfiles/files/rujerisuvuvezixafiguzi.pdfIn PDF document text
    • https://kiptep.ru/file/latixitiwimeroletijuw.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/laruwopowufiw.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/bimubilodagufen.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fba10270f7---27011273019.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/zelijogus.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/75347915356.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/81194037396.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/jefuzi.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/92646660506.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/jimamanadixazagode.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/sowixidalepafumil.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/40327884982.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/wufisameretudiv.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/rufuso.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/gusadujodugebebo.pdfIn PDF document text
    • http://domainecomps.com/documents/files/13000918167.pdfIn PDF document text
    • http://labonscafe.com/userfiles/80447583945.pdfIn PDF document text
    • https://phr4u.com/files/98332365593.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/14203723209.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/60507598647.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/81958338696.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/4838707488.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/fupejutezo.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/xuvosunaxewone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/896FEnmJZlk/uplcv?utm_term=life+in+cavesPDF 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_off0000ea9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AC 19292 bytes
SHA-256: 7ff3c4d6211bad83a80b0af9c853f564cdaa3b4c5e1dc3210c6d90427b051ca3
font_02_sfnt_off000134f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F5 9988 bytes
SHA-256: e6087f409db079b116b54a5dc3d3eb19f8ed54d6ca921df54b44eaff2760f6e1