Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43ab6d24a90d51e…

MALICIOUS

PDF

81.6 KB Created: 2021-09-23 21:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ebde8260c45f00c3352999b8d6ab3f93 SHA-1: 111609c3722d3bc14ba52430179baf62f97252f2 SHA-256: e43ab6d24a90d51e84d3648373bff060d967cb7a3b7b91d0f99bbf9e207761da
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one specifically mentioning 'office 365 shared mailbox login', indicating a phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to steal credentials via the linked phishing page. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the malicious nature by identifying a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://drafthe.ru/uplcv?utm_term=office+365+shared+mailbox+login PDF link annotation
    • http://sampoernastrategic.com/uploads/image/files/21776596749.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/fajemogumeremanutol.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/91369002137.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/37378888803.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/dagab.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/21565361822.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/75596782040.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/zotojijo.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/78998489287.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/27764382919.pdfIn PDF document text
    • https://luminex.pl/upload/file/laxutivoteniwikopelevixi.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/rinutoloza.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/tiregosijujenodumowa.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137102cd8999---vezujenizimimerorizugela.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/linawovegemetimabisa.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/rozomabasigupozumuge.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff0bff2ed5---59630282425.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/54488837922.pdfIn PDF document text
    • https://abss.pt/userfiles/file/milumar.pdfIn PDF document text
    • http://dalaichau.com/files/jowezulizozuxodominemakib.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/lerisexumuzopegabajijas.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/xifibiriferogab.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/sojuvavev.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_off0000d7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F7 17696 bytes
SHA-256: 217efafea873ba47b63f643916e2cd499d3bd271fcc210f97b214f983b799ef5
font_01_sfnt_off000105c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDC 11568 bytes
SHA-256: 7492c7bd0f41017d6e0d8a1ff966b0b98b32827cd753bfc99bdfba8eeb07a401

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