Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d6b29aaf2a21ae5…

MALICIOUS

PDF

75.6 KB Created: 2021-04-22 01:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1e4320efd295590128f75b77b7ea249 SHA-1: 96018979aac34d7bb68fb670d3825fa473801ef3 SHA-256: 7d6b29aaf2a21ae5c00717be88c33ca07a0c7332e5d8bdb1bb6b591015bb8150
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious PDF files hosted on various domains, suggesting a phishing or credential harvesting attempt. The document body, though heavily obfuscated, contains references to 'word cloud generator' and 'wkhtmltopdf', likely as a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://klm3fg.grhosting.cz/sites/default/files/webform/files/16831560309.pdf
    • https://www.blplegal.com/sites/default/files/webform/25596831819.pdf
    • https://architecturaldesigninc.com/sites/default/files/vudezuluxi.pdf
    • https://ambrose.edu/sites/default/files/webform/99544266771.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/ponezilineg.pdf
    • https://aboss.by/sites/default/files/webform/vobefoxejajizagosoberob.pdf
    • https://ambrose.edu/sites/default/files/webform/sovurusogizafubeb.pdf
    • https://ambrose.edu/sites/default/files/webform/bunovodedodasu.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/6948618973.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/73261430544.pdf
    • https://web.liderpapel.com/sites/default/files/webform/xikamiwaboloz.pdf
    • https://architecturaldesigninc.com/sites/default/files/bujepalifomi.pdf
    • http://www.sumnercountyhospital.org/sites/default/files/webform/xubapubawaral.pdf
    • https://www.mainephilanthropy.org/sites/default/files/nikosomonebazi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=best+free+word+cloud+generator+for+mac
    • https://www.ice.cam.ac.uk/sites/www.ice.cam.ac.uk/files/webform/7842358922.pdf
    • https://community.princeton.edu/system/files/webform/22535495660.pdf
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/kozavexol.pdf
    • https://lib.asu.edu/system/files/webform/vabomabexajamoja.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d928.bin
127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD928 6744 bytes
font_01_sfnt_off0000ea0f.bin
c509a0e92ef1437c21d4cbf9448fb2f9065342401c2b65c75ee7202ef35ed254		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0F 5484 bytes
font_02_sfnt_off0000fcc2.bin
005f3c4b731198f4b47b32454121046cb94b8255fc763c0f9ff9641ee33794cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC2 10520 bytes

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