Malicious PDF — malware analysis report

Static analysis result for SHA-256 47ef3bcb5eb537cc…

MALICIOUS

PDF

69.3 KB Created: 2021-10-01 18:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 90d03871f1b1fbbdb96a926c58203f79 SHA-1: 23a789138acd42e32fb86de2d099656d794f6a22 SHA-256: 47ef3bcb5eb537ccd582c5b0501191dd8383aeb7b5a698d85f8e373a7b841c95
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, suggesting an attempt to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy of using many distinct, disposable hosts to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://mayinluatudong.com/uploads/userfiles/file/4853200132.pdf In PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/bewomoj.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/70125818034.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/kixilawoku.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/47100558386.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/borojibolizaralezo.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/duwegifidasipid.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/wilevofipiwomejupakuwo.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210909_053C353FA1685ADB.pdfIn PDF document text
    • https://larsonsvanservice.com/nbloom/fckuploads/file/43130036188.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/35220441492.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/7p5kllovgg2dillleql0k5bat1/benenawijavatusu.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/nevukezusumijugeraxedu.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/52464181680.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/tiwegasiwetonejaz.pdfIn PDF document text
    • https://data-face.noithattoantam.vn/userfiles/file/binolawapevosogawoz.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0a8f7c210---45716417671.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/91061591588.pdfIn PDF document text
    • http://halmar.info/userfiles/file/sevejuri.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210925033206841.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/63575030511.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/91484780430.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/dodenirabugaraw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+uninstall+system+update+on+androidPDF 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_off0000b1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C0 14540 bytes
SHA-256: 136988d8d7d8932aa96374e2b77a6973580fd921220a70a216bbdfcfd36f9588
font_01_sfnt_off0000d609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD609 10844 bytes
SHA-256: 59d8be78a54b403953c34d41a37f5889900d2366eafc142a1b150f3594442446
font_02_sfnt_off0000ef15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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