Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b1e2b462b8c053…

MALICIOUS

PDF

70.3 KB Created: 2021-04-09 08:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8e110b8b9ae46a6e668027cde891daed SHA-1: 28c4ab0ca4cd6ff0a77629b175bfe6a2820833ce SHA-256: 91b1e2b462b8c05381993e35710d4d27274320bb9920dca1a9d0c36156570010
96 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains text related to academic achievement tests, suggesting a lure for phishing. The presence of numerous embedded URLs, many pointing to PDF files on various domains, further supports the phishing or credential harvesting attack pattern.

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 https://ambrose.edu/sites/default/files/webform/juremetepatofuf.pdf In PDF document text
    • https://www.afscme65.org/system/files/webform/96479551545.pdfIn PDF document text
    • https://ambrose.edu/sites/default/files/webform/42416127327.pdfIn PDF document text
    • http://www.guninetwork.org/system/files/webform/heirri_proposals/zarogoluvesiriwameb.pdfIn PDF document text
    • http://portal-mysigma.com/system/files/student-proof/28249136979.pdfIn PDF document text
    • https://www.uts.cw/sites/default/files/webform/vogoledifekotukedadawen.pdfIn PDF document text
    • http://russian-ice-spb.ru/sites/default/files/webform/files/69309865186.pdfIn PDF document text
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/52872338461.pdfIn PDF document text
    • https://ambrose.edu/sites/default/files/webform/85138354947.pdfIn PDF document text
    • https://web.liderpapel.com/sites/default/files/webform/dojoxopanikofogenag.pdfIn PDF document text
    • https://ambrose.edu/sites/default/files/webform/74647609277.pdfIn PDF document text
    • https://vectorcorp.net/sites/default/files/webform/resume/dutaberapowuniz.pdfIn PDF document text
    • https://www.ofalloncasting.com/sites/default/files/webform/dapajinosez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=analysis+and+interpretation+of+scholastic+achievement+test+pdfPDF link annotation
    • https://www.vub.be/sites/vub/files/webform/piwolumubixu.pdfIn PDF document text
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/27560642257.pdfIn PDF document text
    • https://printandmail.princeton.edu/system/files/webform/31356988355.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AA 5548 bytes
SHA-256: faaf5811a33914f1c9d63eeb1a1861c3b789a61c6dffa0f2714ebadb508315b6
font_01_sfnt_off0000e46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46C 10884 bytes
SHA-256: aaecf7cec6eb3be22458ad88572578b5dda7c620f4cafcceb4d0ab51207caef2

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