Malicious PDF — malware analysis report

Static analysis result for SHA-256 e857ede475aeabad…

MALICIOUS

PDF

67.9 KB Created: 2021-02-17 18:29:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: c5b51fcb119ba3ccfae98eec6fa2254d SHA-1: e51fea4a99f224946a4d0073821a2511cdba8c27 SHA-256: e857ede475aeabad93b121f7f9b7ed300d2ef60ca07acc8b5c68d20a9e1fe430
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple external links, including one to 'seumenha.ru', suggesting it is part of a phishing campaign. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure for a 'study guide', which is a common tactic for distributing malware.

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/wix?keyword=ccds+study+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470385/normal_5ff323f3c679f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423780/normal_5feba23c3a7dd.pdfIn PDF document text
    • http://rrrrkkkkk.space/cell_reproduction_mitosis_and_meiosis_worksheet_answersix7a6.pdfIn PDF document text
    • https://towodoruzaxigol.weebly.com/uploads/1/3/6/0/136050186/3249128.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389084/normal_6009a26025a1e.pdfIn PDF document text
    • https://rixagaxovexi.weebly.com/uploads/1/3/4/0/134000332/6832372.pdfIn PDF document text
    • http://kayikciakademi.com/77809792283x6em.pdfIn PDF document text
    • http://choosenews.space/925727562919d9y3.pdfIn PDF document text
    • https://biwoponafi.weebly.com/uploads/1/3/4/7/134767969/c94a287fae576e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378157/normal_601fc5fa076e8.pdfIn PDF document text
    • https://pufetebad.weebly.com/uploads/1/3/4/7/134711346/30920fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bakilipos.epizy.com/bloodshed_dev_c_5._11.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/adding_fractions_worksheets_grade_7.pdfIn PDF document text
    • https://s3.amazonaws.com/kafises/fukedukigaboxeman.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/standard_chartered_remittance_application_form.pdfIn PDF document text
    • http://bizepusozuj.epizy.com/83859531338.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_off0000cfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD1 4776 bytes
SHA-256: cb481bb5a2e6a23169d285bcb41935c79f50e8f3955c84826d5bbf62044affeb
font_01_sfnt_off0000e02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02F 10128 bytes
SHA-256: 575beb887b62e3cef2ffca1b1eabf2b6f87f438794d889e5a599897d9eb906ae

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