Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f457e4fd4aed2f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 05:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d858b41b1d102262dcd8c801f0500764 SHA-1: faf4fa79e56b23c77e4356eddb272589f241a7a8 SHA-256: 95f457e4fd4aed2f672ea309208d5f018cac8f2b9d0cbdeacd5b279a34781c68
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file is identified as a credential phishing lure impersonating Microsoft Outlook. It contains numerous embedded URLs, with a primary malicious URL directing users to a site that does not match the impersonated brand. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to harvest user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://cructi.ru/uplcv?utm_term=windows+outlook+live+mail.
  • 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://cructi.ru/uplcv?utm_term=windows+outlook+live+mail PDF link annotation
    • https://eliteplacementagency.com/uploads/files/ponejojitozagukofune.pdfIn PDF document text
    • http://www.chablis-gautherin.com/ckfinder/userfiles/files/15262275423.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/mudoveruwilunukab.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/83289783591.pdfIn PDF document text
    • https://tele-video.ru/upload/files/fulezewisax.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/84367606667.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/lakadovorixiserexum.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/wilifazoxalalivijajideko.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/9cad4be51971ae0081d5d91238215b72/litofufuvopoza.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/64602252611.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/59980898049.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/41685017302.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/kirugajujana.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/90640135825.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/jalipumojifizigobadebaz.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021941547515336.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/99921003930.pdfIn PDF document text
    • https://netpage.info/userfiles/file/mefibegefunum.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/bataxazusinirefuku.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/jikedadazorimigamovudux.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/kododofamowedevo.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/virosakuredezafufasudosim.pdfIn PDF document text
    • http://rinsacars.com/files/others/zoworugote.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/68348038106.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133613106bb4---papilij.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/povideribokabo.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_off0000d7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E4 16700 bytes
SHA-256: caf1bdff77093a6031095b62813a98d30475d265fce9a9ea18889940ce271045
font_01_sfnt_off0001038f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038F 10644 bytes
SHA-256: c1f77beec9bb9db8095c4f6cd548526e30ab2bf17aea87314cb5f889fd3d1a5b
font_02_sfnt_off00011c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1