Malicious PDF — malware analysis report

Static analysis result for SHA-256 567ef20f06d9c21b…

MALICIOUS

PDF

80.6 KB Created: 2021-09-10 14:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 498521f5f694aebe4551ceca2ab0ae92 SHA-1: 6b09c89d87efc3f48bbbf2157681501a5bc121b2 SHA-256: 567ef20f06d9c21bc350d40c3b38b5e0598dc64f4a1b5b9884ebee2aba89d88c
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF contains numerous external URIs, many pointing to disposable or unknown hosting, suggesting it functions as a link farm or a distribution point for further malicious content. The presence of embedded JavaScript, though not fully detailed, further supports its role in executing malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://fiscalonline.ro/app/webroot/files/userfiles/files/gumogupubuzonapuxo.pdf In PDF document text
    • http://tksvolga.ru/userfiles/file/javiwokewirusifo.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/wijororuvosetokopamox.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3d135f14d---85640708805.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/94715058475.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/51842167615.pdfIn PDF document text
    • http://apsons.eu/files/file/47487877989.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/revaruke.pdfIn PDF document text
    • http://prestopc.it/upload/file/texof.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/nowiremofazibitujarufoli.pdfIn PDF document text
    • http://centronegozi.com/public/92772579621.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/xosewolevuxitos.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/35065411123.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/70598803777.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/guzufikagejisezojuk.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16132e4cc379eb---kekobizazisibunalopo.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/94165814977.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/fibavozenarerulokezevid.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/72994088931.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/bomonewivedon.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/44619892024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=sams+teach+yourself+html+css+and+javascript+all+in+one+pdfPDF 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_off0000d407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD407 17844 bytes
SHA-256: 80046347cd2c1e2cd3d4d2e7208ca345656b93f3fccb897be97922b5b9f0fcd5
font_01_sfnt_off00010262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10262 11372 bytes
SHA-256: a2fb69d52dc40944a45ad40b4636b5718187b6cc8ba9f4625916879b54e4196f
font_02_sfnt_off00011cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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