Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b7dd108ca7ff98…

MALICIOUS

PDF

68.6 KB Created: 2020-11-25 20:37:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5baacc6046c7e3cd19f6d99ae5de7978 SHA-1: 235f41e703a8f6c36c6bb2dc2d707292c232ef25 SHA-256: b4b7dd108ca7ff98e102a4711ccdee3f28f062bc5a5877932d51e5421843b830
104 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure. The file embeds external URLs that direct users to attacker-controlled resources. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://trafffe.ru/strik?utm_term=factors+of+6000 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462362/normal_5faafca3577cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_5f88bd50ca359.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377100/normal_5f89b34b7bf99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376875/normal_5f8ee12429a96.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nowonovege/gatapizop.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/17413331356.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7173aec7-6808-4b23-a74e-138f396233e6/90861992024.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/ds3_sunlight_covenant_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/android_9_cho_htc_u11.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/lifco_english_to_tamil_dictionary_download.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/gibizogifonifibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b79a9fed-4624-45e2-ab70-48cac2d8f2cc/black_clover_episode_62.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45e2248f-6a9f-4ded-a780-52ea2436627f/minion_rush_hack_version.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/waxage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/254826fc-66ad-4c44-ab60-42970a89204c/33804845198.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/4579966690.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_off0000d0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AD 5092 bytes
SHA-256: 04e59318551f620f1630a8aa611b399e74749a0f6cae8fcf3566aeddaa0a43f6
font_01_sfnt_off0000e20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20B 10468 bytes
SHA-256: b94cef1ceda976f38e111bc0e15a185f63abceca6c71e7b9fd1e4110cb240145

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