Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe34fec5f8f08854…

MALICIOUS

PDF

70.7 KB Created: 2021-10-04 04:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4eb7aa8c1eb642c6591e53ce68a3a2ff SHA-1: 58a97c10e46047eb2ffe4faa7258dffeed1478cd SHA-256: fe34fec5f8f08854741ebe622ec7ce1bb08f78cbdd01b47f28cf137bfa9f7c3e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to unknown or potentially malicious domains, indicating a link farm designed to redirect users. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score confirm the malicious nature. While no scripts were explicitly extracted, the structure suggests it could be used to deliver further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://drironcat.com/images/file/warumo.pdf In PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/mubedutubufepozi.pdfIn PDF document text
    • http://technocom.pl/editor/file/54362245646.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/2816753349.pdfIn PDF document text
    • http://secoinblock.com/upload/files/14232297245.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210902_198C90C5E587C9F1.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/56980524158.pdfIn PDF document text
    • https://zhansq.cn/upload/file/41589630848.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/nexaterediriva.pdfIn PDF document text
    • https://klaipeda.cvzona.lt/resources/img/files/ronapib.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/fubikigixigejaju.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/zexebejulibavusowulo.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/67290419132.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210918_225615.pdfIn PDF document text
    • http://slsnn.ru/content/files/vuzebosuxotarebukan.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/pofidoxivuzonasagilamese.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/bewukolose.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210904_202337.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/17875269565.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///gelipipizaj.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/70999638075.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/juxovowirobelefirika.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/jumufakifatudevuvusuzokaw.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36201341666.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/vikuxutanemozupenuma.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/foremekazubanuzosewegubom.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/rabagifuvisar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=types+of+lubrication+systems+pdfPDF 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_off0000b60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB60F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE26 11100 bytes
SHA-256: 07e43ded346bc6c296e1939331a473a3b6724c121594122d4971da9f1c39f436
font_02_sfnt_off0000e7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D1 14708 bytes
SHA-256: d4d3fd42f19166af3f7a6949bde73ba8629a74cbb1b1bf7bdd43156bb30f011f