Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f97885ea1a25563…

MALICIOUS

PDF

68.3 KB Created: 2021-02-24 00:13:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3e0edfe0a3c8a224df1ff73958470c56 SHA-1: 9c3c9a6475aff48d8d21e9c6375511f2098807cb SHA-256: 4f97885ea1a255630f25f9d4e63ef46982cadd4673f3e52b8bb32777f92006d1
104 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of an external URI pointing to a suspicious domain, combined with heuristic firings for urgency lures and embedded URLs, suggests a phishing or credential harvesting attempt. The document body, though heavily obfuscated, contains keywords related to customer service and account termination, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://leonvi.ru/wb?keyword=is%20ebt%20customer%20service%20open PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388163/normal_5fc834449bc52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449014/normal_600a4dc189d5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384149/normal_5fe953a46adfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414695/normal_5fda3aa3b16b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383565/normal_603272ffac60f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487618/normal_5fd336fbe9e14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393369/normal_5fdf131a67399.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477649/normal_5feb486eaddff.pdfIn PDF document text
    • http://the-glow.ru/pmd_to_indd_file_convertersrkvt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381082/normal_601fda55a8155.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465136/normal_600e59c7ed528.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367925/normal_5fce92fc7d262.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381085/normal_5ff2bc8dc8000.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://taguminuligifis.rf.gd/esl_family_tree_template.pdfIn PDF document text
    • http://waxozex.epizy.com/family_tree_vocabulary_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/ronawozezolanag.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_off0000ce83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE83 4972 bytes
SHA-256: c615d696b5faa6c8d5466ff1722d5303b4cdae77aaca6ea9530d2d5ec0bd634f
font_01_sfnt_off0000df5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5E 10764 bytes
SHA-256: 1678287dbd6cf4df2e3c9eddcdc5bf75433eea8f89684d1bed101cfaf2547252

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