Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41bfd6f0105acb6…

MALICIOUS

PDF

76.5 KB Created: 2021-03-20 16:50:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9cd50331b07b5559d278e7a7ff023b01 SHA-1: 068f8a5ba7b24b13ce1e9fe75ce3e3a40fe5105b SHA-256: a41bfd6f0105acb6ca321340b92c580cbde79e8b4526d9d25ed824e7647c77f5
96 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains text related to 'chemistry worksheet significant figures answers', suggesting a lure. The primary IOC is a URL embedded within the PDF, which likely hosts a malicious payload or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/wix?keyword=chemistry+worksheet+significant+figures+answers
    • https://cdn.sqhk.co/dalogunutixo/jbWjbcS/vexifezeladaliwo.pdf
    • https://cdn.sqhk.co/xibetevoxaj/bv3KjiW/pajibimazizelos.pdf
    • https://cdn.sqhk.co/nimuxugemu/gipDhiQ/temexiwamavezegapapi.pdf
    • https://cdn-cms.f-static.net/uploads/4483097/normal_604505bdeb970.pdf
    • https://cdn-cms.f-static.net/uploads/4483856/normal_60147cbb3e6be.pdf
    • https://cdn.sqhk.co/gopuxipo/27ifhdY/31781449644.pdf
    • https://cdn-cms.f-static.net/uploads/4462341/normal_5fdbe13c5c96d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://besasasef.rf.gd/jorumodalubojanejas.pdf
    • https://s3.amazonaws.com/vunizi/kefodokofajekisusavubopiz.pdf
    • https://uploads.strikinglycdn.com/files/c66f29c2-b44b-4c83-a459-e5e39c9bd66f/john_deere_l120_48_mower_deck_spindles.pdf
    • http://zemorirasipiw.epizy.com/make_smaller_illustrator.pdf
    • http://gafomawonerif.rf.gd/analyze_data_in_excel_sheet.pdf
    • http://nupopejif.epizy.com/filmmaker_app_for_pc_free.pdf
    • https://uploads.strikinglycdn.com/files/6af2845b-b150-47cd-b5bc-218fbfe1bc5a/como_aprender_hablar_ingles_gratis_y_facil.pdf
    • https://uploads.strikinglycdn.com/files/d1b447cc-6746-428e-92b8-a46ead3ebbe1/jugokadokumekurelulajogog.pdf
    • https://s3.amazonaws.com/wunojipu/divinity_original_sin_enhanced_edition_guide_walkthrough.pdf
    • https://s3.amazonaws.com/mejigavukolu/clue_score_sheet.pdf
    • https://uploads.strikinglycdn.com/files/b24977d6-3207-4a13-9c10-f414a7e1013d/67981856069.pdf
    • https://uploads.strikinglycdn.com/files/60098a13-39f2-43ab-a2ec-2c443a92fe55/zisafogogenil.pdf
    • http://rorolavosi.rf.gd/partes_de_revista_informativa.pdf
    • http://folujas.epizy.com/material_ui_icons_cheatsheet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edb4.bin
92ce0003f3dc96737d561987b69ad31f3715fc5a32e92a0c9f7616f74dea2952
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB4 5428 bytes
font_01_sfnt_off00010018.bin
9f2589f4a0e3e9662ccf190d3be3fe0658a114566b4e4d4e1f346853d09b0c2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10018 10080 bytes