Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ee38a6658de53e…

MALICIOUS

PDF

91.3 KB Created: 2021-09-18 14:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b6ef45e44aef421eec36a08dff03bd62 SHA-1: 4652b552194262a621c9b5dca4820f8c88bc105f SHA-256: 19ee38a6658de53ea201d539c1e6718a41f6ea828bd2a90a7d4601dd6bc25907
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://garglob.ru/uplcv?utm_term=what+to+write+before+sending+a+resume PDF link annotation
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a6d96933a---60763335610.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436b52f2bc2---61500643685.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/50656507023.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/puvezamugizorofomam.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/pifike.pdfIn PDF document text
    • https://motoralbini.it/files/file/wufipugibebogoweped.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/nomebelalotobo.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/26864447645.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/jukaji.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/vometatefo.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/fedolipojikanirofeboto.pdfIn PDF document text
    • https://ultralloy.net/upload/files/50916390287.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • https://makanbanyak.net/contents/files/pukulazo.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/kufewadarus.pdfIn PDF document text
    • http://pnalog.ru/images/file/14770658720.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/57960591573.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/tewobese.pdfIn PDF document text
    • http://cplust.com/upload/serback/files/20210918141646.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/31990940235.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/kovepiv.pdfIn PDF document text
    • https://remini.hu/userfiles/file/papozakepoxifamelozil.pdfIn PDF document text
    • http://knauto.com/upload/file///vefapiguju.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/gikug.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_off0000ff91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF91 17604 bytes
SHA-256: 3aa5e079f1ddde9a8718b1fb06d6be0e2e6762feaa2761e5e73a784b80b6d816
font_01_sfnt_off00012dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E7 11072 bytes
SHA-256: 34ed5748c4312b707c8b1abf458ef8dc1786a5e173093e3cd46ce4077faff7c9