Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4c616828223446…

MALICIOUS

PDF

74.7 KB Created: 2021-04-08 02:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64d9f823c081931402d332e8f42dcb30 SHA-1: 731a0d99c5eb082784f6a345391aeab4ab54e43d SHA-256: 8f4c616828223446f62bfbe8035cb1118e0e3c68d7aaca9ac6b6b20b0e9bd092
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a URL that appears to be a lure for downloading an Android application, suggesting a phishing or malware distribution attempt. The presence of multiple external URLs further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/wix?keyword=descargar+apk+kingroot+5.1
    • http://nopotaz.medianewsonline.com/bussmann_glass_fuses.pdf
    • http://vazawujuzu.sportsontheweb.net/negimiwo.pdf
    • https://static.s123-cdn-static.com/uploads/4501231/normal_5ffba4db97c83.pdf
    • http://puwinowelin.medianewsonline.com/fadevozisamijuk.pdf
    • https://cdn.sqhk.co/perokokamosa/jjbejaa/nfl_week_12_straight_up_picks.pdf
    • https://cdn-cms.f-static.net/uploads/4478146/normal_5fe6b252648a7.pdf
    • https://cdn.sqhk.co/fofateze/jOegcrP/secure_voice_notes_private_notepad_with_lock.pdf
    • https://cdn.sqhk.co/sirazisiluz/pCygfkR/elliott_jaques_requisite_organization.pdf
    • http://dazolovegom.mygamesonline.org/windows_command_line_ctrl_c_not_working.pdf
    • https://cdn-cms.f-static.net/uploads/4377379/normal_604cc395ac406.pdf
    • https://cdn-cms.f-static.net/uploads/4471688/normal_601e5c7504e39.pdf
    • http://woronari.getenjoyment.net/17534531801.pdf
    • https://cdn.sqhk.co/rujiwujik/jcVhaJB/offline_brain_games_app_download.pdf
    • https://cdn-cms.f-static.net/uploads/4369506/normal_606137f5511be.pdf
    • http://lebuvowune.getenjoyment.net/norumevugiwalitomoleje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wokakasav.onlinewebshop.net/adobe_reader_free_download_for_android.pdf
    • http://xonolori.atwebpages.com/bakery_equipment_list_and_prices.pdf
    • http://medexode.atwebpages.com/monomosopefizinun.pdf
    • http://geralumumavol.rf.gd/proper_risk_management_forex.pdf
    • http://bamogadosi.rf.gd/10462217671.pdf
    • http://firiwigisu.atwebpages.com/508190564.pdf
    • http://romisov.epizy.com/naledipikidus.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_off0000e563.bin
c4dfdcd0906399ff625e6f4c6634e87885dd527c8ad30fb01a59677fd7b1f12e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE563 5340 bytes
font_01_sfnt_off0000f7bc.bin
1be3ee375173bd832310f87bb5eccd1f519f286cd0651367a46a0ddcc9b1af2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BC 11652 bytes