Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce3e5f539a29390…

MALICIOUS

PDF

71.9 KB Created: 2020-12-20 14:33:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c9883af7be335a7c06e87e44995ebcd6 SHA-1: 9f4a985fa906b039c8845585316fd4f2ac8a3c31 SHA-256: 8ce3e5f539a29390c5c7379a444ffa4177ab9aac22509284e6c34da7079c80c1
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic indicating it links to known malicious redirector infrastructure, specifically `https://cctraff.ru/aws?utm_term=it+essentials+checkpoint+exam+answers+2019`. Additionally, a high-severity heuristic flagged a 'Clipboard command execution lure,' suggesting the document instructs users to copy and paste content into a shell. This combination strongly implies an attempt to trick the user into executing malicious commands, likely leading to the download and execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://cctraff.ru/aws?utm_term=it+essentials+checkpoint+exam+answers+2019 In PDF document text
    • https://jaxemojemilela.weebly.com/uploads/1/3/4/6/134622921/wojumesemu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443292/normal_5fd9942528958.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421623/normal_5fabde9a44446.pdfIn PDF document text
    • https://xazepobuzu.weebly.com/uploads/1/3/4/5/134582826/xaduxozujosuk-meviromexop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373998/normal_5fc06c7d75795.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/negonanopix/polufexevevivipuvipow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c5a4340-fe92-4f5d-8fc4-ac58e3f2e7ed/64306706939.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/50961670030.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71fe753b-353f-4df7-a8ba-53b044a7d727/kugogululizo.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/39978213626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7db42e4-aa90-427d-b623-a84897d685e6/77621815378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fadb9e5-7ff5-4a9f-8936-f42ff3efc5a8/25765107158.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/vigideboworu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0de6bb7-1d09-4bed-9bd4-6608d0ba0b14/wowwee_light_strike_scope.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/intranet_et_extranet.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_off0000da5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5B 5816 bytes
SHA-256: bca9b1e91671c6cf826cc3bce0f7f6083906f5313b254691b7a316f806c081f2
font_01_sfnt_off0000ee0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0E 10708 bytes
SHA-256: 9f244a9324a06283e3c613ec284c99274d289aea460e2ecd2818549d5aeac8b2

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