Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ef571ef88751f5…

MALICIOUS

PDF

76.8 KB Created: 2021-09-17 12:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 12e8c0bda939bd6337a50f0852f8dc0d SHA-1: 2528c750def781a4d1138212231eda0b39c21362 SHA-256: d7ef571ef88751f54fa2dc0b7f8ddffb05aed083c89413379b612dcc9676ab04
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm, pointing to numerous distinct domains. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm nature of the document strongly suggest it is used to redirect users to malicious sites, likely for phishing or malware delivery.

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 https://ohcsi.com/ckfinder/userfiles/files/gamarakaxetifoxe.pdf In PDF document text
    • https://sitycare.com/FCK-UserFiles/files/xaxuxes.pdfIn PDF document text
    • https://terracell.info/images/file/zexazum.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/xabuzovewig.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/nakumemerosowugar.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/77779928819.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/86142706806.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9ea8b5277---82323546773.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/degifolijelujekuk.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/29020539105.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/12794316992.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/76553654739.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161333f8524388---38514762866.pdfIn PDF document text
    • https://majubesar.info/contents/files/10573888900.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/fesinagotaxuriwoxikufif.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/4156076771.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/57901116688.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/rurapoge.pdfIn PDF document text
    • https://fond.ru/userfiles/file/22539838894.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/62633777359.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/84183142181.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///finobitakoxoregud.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/81928311867.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ardaas+karaan+song+downloadPDF 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_off0000caf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF2 16908 bytes
SHA-256: ff8c96af1b87fe7a5c7658862770e23fbebae6cce8aa64ddbbe6700004223876
font_01_sfnt_off0000f6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE9 10260 bytes
SHA-256: deb0427cf021d474db24e9cb39f1d1911c52fafc6ff5cd43615359dbc6dbe78f