Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b4d8f1b78be108…

MALICIOUS

PDF

73.0 KB Created: 2021-04-01 13:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e8d9c9daf11e2449b6bee79a957fa4b4 SHA-1: 55e95a76530f2b97ed1067282617b02af551f07e SHA-256: 21b4d8f1b78be1084ec9ed139a7966554cbb98a30d701567a20e75c485ed0274
96 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. 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 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/123?utm_term=elizabethan+serenade+free+piano+sheet+music PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366627/normal_5fff7e0da6399.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454672/normal_5fce287146c3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407756/normal_5fe1644091a24.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/ejhgjgg/65045387623.pdfIn PDF document text
    • https://cdn.sqhk.co/zimajigon/f1nqbMH/80448331470.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413121/normal_5ffb22a4e6be5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416661/normal_604a44200189e.pdfIn PDF document text
    • https://cdn.sqhk.co/tixukiko/dVHjgr0/garnet_hill_queen_sheet_sets.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e28d129-499e-466e-b2d6-16605c6480ec/how_do_you_reset_an_ao_smith_water_heater.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/gst_tax_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af41e2f8-d9fb-4194-9197-624795831be3/star_wars_the_force_awakens_incredible_cross-sections_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/mixip.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/ludufirajinexinunujepuja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/139976cc-54f6-4a74-b19d-46e4bc592afe/9601442072.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/ncert_math_book_for_class_8.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/autocad_2d_electrical_drawing_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/83912400439.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_off0000df3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3B 5544 bytes
SHA-256: 4743617f42336778df792c423969977311e37d6c9b9f6d95c367159e9ea60260
font_01_sfnt_off0000f1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EC 10880 bytes
SHA-256: 1195de05b5ccc90f2f055421fe7ee0d378d23f27ebc0578211e4220738d8d63e

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