Malicious PDF — malware analysis report

Static analysis result for SHA-256 46acf4bdd356ae23…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 01:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01381f3e07600cf3fd35da501765a647 SHA-1: 3d54f3d6bc6e61a13b4387884a4c34731ce2ed1e SHA-256: 46acf4bdd356ae236303dbdcc04cef2606c8e974138ff17c86db5fd68250dc5e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is designed to host numerous links on various domains, likely to obscure malicious destinations or engage in link farming. While no scripts were explicitly extracted, the PDF structure and the presence of numerous embedded URLs suggest an attempt to redirect the user to malicious content, aligning with phishing or spam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/96c64333fa12564353148d590f2778f9/nopuze.pdf In PDF document text
    • http://studiofranzoni.eu/userfiles/files/85494886581.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/62032926635.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/gegenasuweku.pdfIn PDF document text
    • http://ternovykh.ru/content/file/fimupapewolu.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/wukomu.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/21486486104.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/79728071017.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/vujakeguzekex.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/85180383811.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/29346982163.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/30171041873.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/5920438300.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/10061523692.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/54443864318.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/16465852227.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/13221832239.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/pavuvifiwenuv.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdacbbe96e---kudafapilalizuvuzokirelo.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/puvudakebuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=rank+tracker+keyPDF 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_off0000b1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D5 17044 bytes
SHA-256: 1efbb5513b01a524269607d87e89181bdbefeb1c2ca219fb0e4b967d7f2681dd
font_02_sfnt_off0000f538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF538 10048 bytes
SHA-256: 0afd0cc7c43d996117a685c403fe0ce579bce976dafdae45dfc1eedd3d89eb16

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