Malicious PDF — malware analysis report

Static analysis result for SHA-256 e943ae75ce1c28d3…

MALICIOUS

PDF

83.6 KB Created: 2021-09-14 13:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 885414588f1bb903c453205054f75a43 SHA-1: 68f544ac3dd689aad75343dbce75a0b3af66efa9 SHA-256: e943ae75ce1c28d35b1757aa19f4a0bcb0fc4585497511c7c1d20978582389e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, indicating a link farm designed to redirect users. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, suggesting the document's purpose is to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://mexico-airport-transfers.com/ckfinder/userfiles/files/werogenori.pdf In PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/17913488518.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/pukitexekuwubatov.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/28106609661.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/71650653358.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1a959e341---libewoluxilaxelumobibal.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/fewenunulijiserefa.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/13196944057.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/54668335605.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/vexivaxiv.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/wilozamarotenej.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/neguvekinefip.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/jevaki.pdfIn PDF document text
    • http://mopron.ru/upload/files/13444045538.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/rufuludijulowegimot.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/vewekepopitexeratezur.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/bizazuza.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/pojemusuvekabalorida.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/67966367652.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/gaxuminagepate.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/94438228119.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/bizos.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/xupod.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/78285229098.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/21156784027.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/85288184581.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631285808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=maximum+quadratic+functionPDF 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_off0000e17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17C 18008 bytes
SHA-256: 3218c5c7f28f4ccb3e6c4b6392940896489a1981c29034402d87c76cb1379f66
font_01_sfnt_off00010ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12812 10632 bytes
SHA-256: ef7e407bca96c27b44908dd164a06a2f05d27716457115eeb43da21fda1df26b