Malicious PDF — malware analysis report

Static analysis result for SHA-256 743b40f48393132d…

MALICIOUS

PDF

62.5 KB Created: 2021-02-06 08:46:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 59213e18bed41a0766f54e69322ea736 SHA-1: d93444aedd162c20b174c881cd756254c6a0b9a5 SHA-256: 743b40f48393132d48ed1ae4205c6901582c5b03519f03c1f59e6149fed80eed
136 Risk Score

Malware Insights

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

The file is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains embedded URLs pointing to potentially malicious domains, and the heuristic 'SE_LOLBIN_RUN_COMMAND' suggests the document may attempt to execute commands. The presence of PDF-specific heuristics indicates exploitation of PDF vulnerabilities to achieve its malicious objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/wb?keyword=nuclear%20physics%20definition%20pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366022/normal_5fe5ab72a7f4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411481/normal_5fcfa337dbd25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471941/normal_5fc8033d2aa4b.pdfIn PDF document text
    • http://daliadiago.com/petevaripoximucmdnz.pdfIn PDF document text
    • http://dkshlyap.ru/39683190393lo1jr.pdfIn macro / runtime command snippet
    • http://terubib.22web.org/osmosis_in_plants_worksheet.pdfIn PDF document text
    • http://faceit.su/evaluating_limits_graphically_1_worksheet_answersyk8nt.pdfIn PDF document text
    • http://ideal-it.fun/mechanics_of_materials_3rd_edition_philpotlip2q.pdfIn PDF document text
    • http://gravkamen.ru/helicopter_crash_nyc_midtown_manhattanodnis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416132/normal_5ff936e5d7c23.pdfIn PDF document text
    • http://zoom-omsk.ru/sezikinofevukiwaneke8qfj4.pdfIn PDF document text
    • http://nesobaka3.xyz/mini_missions_settlers_online0qd2i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fotisojaz.rf.gd/art_gallery_images.pdfIn macro / runtime command snippet
    • 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_off0000bb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB56 5316 bytes
SHA-256: 2573c60ba7e41ca80b6808748a91750253862720140f6fc3223bd09deb973a70
font_01_sfnt_off0000cd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD71 9344 bytes
SHA-256: f5d9ecf50cf239afc3ed52ef4cae69f05308b9a7f9a0fa2969739b153929c71c

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