Malicious PDF — malware analysis report

Static analysis result for SHA-256 73992c1a815b6900…

MALICIOUS

PDF

72.9 KB Created: 2021-03-23 15:41:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21e43c15f5d04ffd3f2043b416980914 SHA-1: da36afed1859e6e1ac226510fddadd3e5d43a561 SHA-256: 73992c1a815b6900a73813472dc8dbb7d11d784f2e04f3036d67e8ec81b73868
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URI that redirects to a URL disguised as a worksheet, likely to trick users into downloading a malicious second-stage PDF. No scripts were extracted, but the presence of external URIs and the overall detection suggest a phishing attempt.

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://kuzutuzo.ru/wix?keyword=systems+of+inequalities+worksheet+pdf
    • http://perorivatifurar.iblogger.org/81756090625.pdf
    • https://cdn.sqhk.co/rotogogoji/hgj3ggl/best_military_drones_for_sale.pdf
    • https://cdn.sqhk.co/jawutuwek/agfsSjc/dynamic_cleaning_and_restoration_lake_havasu.pdf
    • http://esagafow.fun/yeh_shen_themegtlz5.pdf
    • https://cdn.sqhk.co/talulofofexa/jgIijjg/kunafonavijifuvujejatataz.pdf
    • http://my-favshopc.online/sekajusigasozuzimejodota2dpab.pdf
    • http://runmasten.online/7757510570hrt08.pdf
    • https://cdn.sqhk.co/bitomasijelo/6XwU1D2/basketball_shooting_machine_homemade.pdf
    • https://cdn.sqhk.co/jutafegobexe/Fichdie/nafowejowabepuletepojiw.pdf
    • https://cdn.sqhk.co/tetolonul/3iajeha/turtle_dove_midsole_paint_pen.pdf
    • https://cdn.sqhk.co/bomumuxa/jBnjjke/redisefiso.pdf
    • https://cdn.sqhk.co/kiraxozi/xgiVic9/zenavufina.pdf
    • http://m-ryanaf.site/fadokupexasanf78al.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/742a30d9-7d9a-4722-88b1-b085e403eccc/lesijugufus.pdf
    • https://uploads.strikinglycdn.com/files/b536be32-c4ed-47b1-9a7f-32f5a9fbef52/matlab_free_download_cracked_version.pdf
    • http://kuwokezolofe.epizy.com/kofus.pdf
    • https://uploads.strikinglycdn.com/files/e527aa5f-ebf1-4012-8035-dff4c95c507a/quantum_field_theory.pdf
    • https://s3.amazonaws.com/jotizifime/xavefututede.pdf
    • https://uploads.strikinglycdn.com/files/bf4bd611-79e3-4f0a-8bb3-bd55ab65bac8/70245219350.pdf
    • https://s3.amazonaws.com/tiluwisulepam/vogofebim.pdf
    • http://pozidatizoza.rf.gd/cacing_tambang_usu.pdf
    • https://uploads.strikinglycdn.com/files/d147efbd-7051-4fd5-9d6c-c7aa6dd1f5fa/72902890698.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_off0000dd3d.bin
61d1ef4ecd827ee88b5ee041413ac10e25adfeda1a047a680f60eb68874c3521
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3D 5768 bytes
font_01_sfnt_off0000f0cd.bin
2a92b14c8f53848c6916cd2fdba797aea37438271235153c97a9b7272e49a7bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CD 10812 bytes