Malicious PDF — malware analysis report

Static analysis result for SHA-256 312e39c5319e7725…

MALICIOUS

PDF

78.6 KB Created: 2021-09-17 14:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1cf8e85d16b69f651d12fdd247c369df SHA-1: e13439d22288a365268f1b2e924fdc909c92fcce SHA-256: 312e39c5319e7725772dac9b1688ce068c0a1e25d97942faeb4c32fc5546ce33
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting an attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate effort to create a large number of links on potentially untrusted hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://narellesastro.com/userfiles/files/89271049904.pdf In PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/9jromu6j0bkclq5n4mthdovel6/92487158374.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/33978452209.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/gavawazemalopu.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/koliva.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/kofuwipadebufip.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/vigomepixobipigisij.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/47441578285.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • http://visusmarble.com/images_upload/files/1951716213.pdfIn PDF document text
    • http://guchen.ru/d/files/94953570.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/91817206990.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/xoferi.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/93831977424.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/vavigapadivuk.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/guruvi.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/niguxibu.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/vuxoxusexojokakubukaj.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/98638600845.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/d11d82df2504d6343a668ed5282b68d0/38552362982.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=lego+battles+ds+romPDF 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_off0000ce85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE85 17644 bytes
SHA-256: 43484afc645590e5953bacca605dd7250b41cd2877d9dad0118b96aaae51a74e
font_01_sfnt_off0000fc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC56 10492 bytes
SHA-256: b353c3bad1db9e9635bff015b13bf52e86cd1ef1e780eb4f95a3a593ae9ae956
font_02_sfnt_off00011410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11410 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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