Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ba07b5eadcdd6af…

MALICIOUS

PDF

82.6 KB Created: 2021-03-25 23:51:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 672814a014ff78bb611d0914418259db SHA-1: 518d1866aac431880eeec5f69c960fbbe2ca33c6 SHA-256: 6ba07b5eadcdd6af3cec29219a7f5e4b7e0edbedfb51db612947454395a30305
76 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains an embedded URI pointing to 'jumiwimov.ru', suggesting a phishing attempt to trick the user into downloading a file. The heuristic 'SE_LOLBIN_RUN_COMMAND' indicates the presence of a command line that includes 'curl', further supporting the download lure. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://jumiwimov.ru/123?utm_term=file+from+url+without+browser
    • https://cdn-cms.f-static.net/uploads/4451039/normal_600e48da0fc8a.pdf
    • https://cdn-cms.f-static.net/uploads/4426813/normal_5fdc3a6f8d4f1.pdf
    • https://cdn-cms.f-static.net/uploads/4488101/normal_6052e24deef2c.pdf
    • https://cdn.sqhk.co/pulizojiwim/idcgiie/passcode_lock_screen_forgot.pdf
    • https://cdn.sqhk.co/susotizakaxe/cKSgcTj/voduzimege.pdf
    • https://cdn.sqhk.co/lofujumixas/JKsPnhg/ninja_jump_game_download_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4462379/normal_5fe9101ccf7d7.pdf
    • https://static.s123-cdn-static.com/uploads/4463272/normal_5fddd20b6d267.pdf
    • https://cdn-cms.f-static.net/uploads/4476432/normal_604646f94e60e.pdf
    • https://static.s123-cdn-static.com/uploads/4379486/normal_5ffa27acabb95.pdf
    • https://cdn-cms.f-static.net/uploads/4494433/normal_60379244e7900.pdf
    • https://static.s123-cdn-static.com/uploads/4416661/normal_5ff3c6df114cf.pdf
    • https://cdn-cms.f-static.net/uploads/4502819/normal_5fe7857e984f7.pdf
    • https://static.s123-cdn-static.com/uploads/4403533/normal_5fece68e2e940.pdf
    • https://cdn.sqhk.co/fabokofe/iwif8jc/82487767095.pdf
    • https://static.s123-cdn-static.com/uploads/4369494/normal_6006bdcd17896.pdf
    • https://cdn-cms.f-static.net/uploads/4481509/normal_601181e1de267.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wanikokod.epizy.com/banque_de_france_recrutement_informatique.pdf
    • http://mogopubu.epizy.com/chirutha_songs_free_320kbps_doregama.pdf
    • http://liwununigu.epizy.com/58614795894.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_off0001071d.bin
56fe7847a1740a04c324918dfd39ce186f83677adb8429ccaaca70fdbf869e73
pdf-font-stream PDF embedded font (sfnt) at offset 0x1071D 4984 bytes
font_01_sfnt_off000117fb.bin
6abedb81686250849ce02661af82250335dc2626e853dd478d8ee6d5e21fab3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x117FB 11340 bytes