Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8831788d8efe95…

MALICIOUS

PDF

73.3 KB Created: 2021-02-19 05:41:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3d747167d904c1a814edf2d659fc1a11 SHA-1: 27c39ea4b3a41c263fffd04477e3ad4dca38c20a SHA-256: 5a8831788d8efe95ee872da27686e8cbd8a7cd1a5e52b9b4801546bff8400e2d
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a URL that masquerades as a search result, likely intended to trick the user into visiting a phishing or malware distribution site. ClamAV and ML classifiers flagged this PDF as malicious, indicating a high probability of malicious intent. No scripts were extracted, but the embedded URI is the primary indicator of compromise.

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://seumenha.ru/strik?utm_term=university+of+pennsylvania+face+masks PDF link annotation
    • https://cdn.sqhk.co/fejavegiwo/bA4zjjb/39833695225.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456389/normal_602af3f725b62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406241/normal_601a1fbd1893e.pdfIn PDF document text
    • http://dakijexok.22web.org/bacharelado_em_sistemas_de_informao_ead.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418171/normal_600dd74c9c615.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/8ijjcmn/flipside_tumbling_cheerleading.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393632/normal_60201b2f0dd4a.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/tozaduliwubega/74847494276.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/infection_control_management_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/industrial_wastewater_treatment_methods.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/dilapidation_report_cost_melbourne.pdfIn PDF document text
    • http://wilafeduzavedew.epizy.com/finding_greatest_common_factor_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/jijitasujoxofizopogix.pdfIn PDF document text
    • http://pomadepoxe.epizy.com/swann_security_camera_installation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/civil_engineering_books_india.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/me_after_you_paul_kim_ost.pdfIn PDF document text
    • http://xibobok.rf.gd/river_flows_in_you_notes_sheet.pdfIn PDF document text
    • http://romevakamijoke.epizy.com/nagaramojizogipalosuruka.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_off0000e02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02F 5376 bytes
SHA-256: fad8d288b8c6e2e73c3f3b59249a9a31e138d1a4b1b38e71cfcb010a3abf73ae
font_01_sfnt_off0000f279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF279 11144 bytes
SHA-256: 4ba7d702c853f0e0d2db141950934d8efe77c4036590e4a862913535bfabcb93

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