Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7d9ad22019995f…

MALICIOUS

PDF

79.6 KB Created: 2021-09-20 01:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 66878ec54ed2a7ba7177fffe6cc7b8d3 SHA-1: 4050500452ed7cf0b18a26ed2a0abebd7f343df8 SHA-256: ef7d9ad22019995f449e3416065a662b1204811b79e5cb97de3f8e67e6fcc0e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, suggesting a phishing or redirection scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is part of a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://teranor.com/ckfinder/userfiles/files/xarokepezulorosubodid.pdf In PDF document text
    • http://avvocatogiuliani.it/userfiles/files/giwij.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614364e8c4653---38007661388.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/rugubizanivazapawujesi.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/69009629432.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/pelokabobo.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/13489551519.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/pukakizizige.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/pidovaxipedufadukori.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///najidujigoxateb.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090705044273499.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/tifulujatazutoruwe.pdfIn PDF document text
    • https://jjpremiers.com/files/degogig.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/jasugejatitewupos.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/93490623997.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/15652055570.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/16445086607.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/49192860389.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/xokalam.pdfIn PDF document text
    • http://amdind.com/userfiles/file/79385407804.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/kimezujagikatuvivumuva.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/83088869009.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/56433394717.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/29703652727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=instagram+likes+viewsPDF 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_off0000d3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FE 17868 bytes
SHA-256: 8b0d1ac17e120a5ab98b8fde4fa474532553e65f8af84214983e6d679a9250a2
font_01_sfnt_off0001015e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11975 10528 bytes
SHA-256: e54694dd2d7e4c980807cf8be4b7a9bcda92843d7ddfb2a01ba3ab21da92ace0

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