Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be4d2dadb455445…

MALICIOUS

PDF

75.2 KB Created: 2021-01-02 14:11:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 750afed565904b62a051d1c65838bd5f SHA-1: 9aef0dcb97354d4a8867cf44b81b846dfd324457 SHA-256: 8be4d2dadb455445be10a490e2d65898671a97c6ac099d65ddfb62468664e8dd
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it contains an embedded URL and attempts to trick the user into executing commands via clipboard manipulation, a common technique for downloading and running further malicious content. While no scripts were directly extracted, the combination of the phishing lure and the embedded URL suggests a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://trafffi.ru/aws?utm_term=chat+application+project+report PDF link annotation
    • https://kotevopokevunab.weebly.com/uploads/1/3/4/5/134590751/gaxon-xusaw-zoxebejojagoj.pdfIn PDF document text
    • https://lexezidelaxo.weebly.com/uploads/1/3/4/6/134605078/6216870.pdfIn PDF document text
    • https://rikisuluwujufa.weebly.com/uploads/1/3/1/4/131452938/fuzejanitip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ae742c9-d351-485f-95b1-01349880d05e/fortnite_scrim_naw_discords.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/modiramuzizagibiboruroko.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/xozuzabogijavera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7c28369-a5d7-4016-8e17-7527fceb15fc/realtek_digital_output_no_surround_sound.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3da893a3-629c-4521-8910-70a6ce68c359/47907231303.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/amor_de_verdade_musica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc3dbeeb-f842-488e-a781-a9c7971e6bb8/malipo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d824261-7cf4-4443-8932-c985fc140795/kiliferem.pdfIn PDF document text
    • 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_off0000e9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C3 4824 bytes
SHA-256: 84d0cae19cd242c71fb864ae66a9add4659efbf34994a0357841bf283ae8fb75
font_01_sfnt_off0000fa24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA24 11028 bytes
SHA-256: d0d15f9b5ed45ef6e1946c3d3f4a269f7651af2775251efd83ccea16cc21114d

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