Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b11ba08b2d8d9e…

MALICIOUS

PDF

73.7 KB Created: 2021-09-18 10:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 652ca07c13c9229ff30a29106b5ad938 SHA-1: d3653adc8d424a872e1b22517bb9e0de6696fb66 SHA-256: d6b11ba08b2d8d9e124ed35637e6fff3619bfb33e0ddc2070ca6ce6edc631cfb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, indicating a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to redirect users to potentially harmful sites. No scripts were extracted, but the presence of numerous external URIs is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crysiq.ru/uplcv?utm_term=ifttt+alternatives+android PDF link annotation
    • http://stalmont.eu/userfiles/file/tisasegewijifivizepobuti.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8688715f1---27847751885.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/jebavusagu.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/19838216408.pdfIn PDF document text
    • http://wenxuezj.com/images/File/mujigumebelotitunivizoxad.pdfIn PDF document text
    • http://bienbao.org/uploads/files/55234723657.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/todurazetazijumawe.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/jupavugogu.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/87144855735.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/zelurotedefefofubekori.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/78181686490.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/bapuvotajume.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/93610982545.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/99485432255.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/famirafofajebawip.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/70019248238.pdfIn PDF document text
    • https://linardi.ru/files/file/24982052847.pdfIn PDF document text
    • http://usateatop.com/_upload/files/11003421290.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/vigujomunofipadavadidi.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/getasopipitedunitodikamas.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_off0000bf20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD737 10364 bytes
SHA-256: 5f152bb6eea3b49e594744c8831205a29c3c3a90359dca3d2daf8f2f290720e3
font_02_sfnt_off0000eec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC7 16700 bytes
SHA-256: ed05198977d7054161adaa097443f48749e04f1bfbe92fb713358f871d685d87

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