Malicious PDF — malware analysis report

Static analysis result for SHA-256 69feae0239dfaeca…

MALICIOUS

PDF

68.0 KB Created: 2021-02-13 09:17:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f21a54483e0e36e1233465b54fae8b00 SHA-1: 9b92fbeb897a0f7be43c35af2f8bc0aed221e3cb SHA-256: 69feae0239dfaeca39d933b34a1f099068d65e1d447d0df518da0c5ba33d47bb
254 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with critical heuristics indicating it's a redirector and part of a link farm. One URL, 'https://crophysi.ru/wb?keyword=cerrar%20sesion%20gmail%20app%20android', is flagged as a malicious redirector. The document body is heavily obfuscated, but the presence of these links and the ClamAV detection strongly suggest a phishing or malware distribution attempt, likely leveraging a client-side exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crophysi.ru/wb?keyword=cerrar%20sesion%20gmail%20app%20android In PDF document text
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/578385.pdfIn PDF document text
    • https://ruzuwigowan.weebly.com/uploads/1/3/1/4/131453288/3049322.pdfIn PDF document text
    • https://sikiroradimer.weebly.com/uploads/1/3/4/6/134619363/5577c.pdfIn PDF document text
    • https://vubenazago.weebly.com/uploads/1/3/4/3/134357699/e6794d947e.pdfIn PDF document text
    • http://heartcenteredequestrian.com/75488677296m0gj3.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/xukonakefules/70016618192.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/bowflex_selecttech_560_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/vidmate_apk_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/87704205233.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/suvubomoginonome.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/english_to_spanish_translation_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/fidelity_platform_adviser_login.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/audit_interview_questions_and_answers.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_off0000cbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF4 5184 bytes
SHA-256: 7be2a84b3036085f40cdbbca6c14e1c57c50177532f6583b305a2aecdae78c64
font_01_sfnt_off0000dd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD79 11084 bytes
SHA-256: de2d2a1f90c2caeab3a4b21646f15fff64542f4ace7c1b51ee1a181feea40cf2

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