Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90d8ae8e3f06e37…

MALICIOUS

PDF

72.7 KB Created: 2021-03-01 06:05:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 1e110b0adea6f81bc4d1c1e1d94253e1 SHA-1: b37e47404093cbaa3987e2ee0afa19ae7a472814 SHA-256: a90d8ae8e3f06e378446357c1ef23c351bc91db6326dd9b0d593a074e426bf94
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external links, with one pointing to 'seumenha.ru', suggesting a phishing or link-farming attempt. The presence of embedded URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate malicious intent, likely to redirect users to harmful content or initiate further infection.

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
  • 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.
  • 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/123?utm_term=a+raisin+in+the+sun+sparknotes+act+3 PDF link annotation
    • https://tekeginisexufu.weebly.com/uploads/1/3/1/3/131381150/8062521.pdfIn PDF document text
    • https://cdn.sqhk.co/gutifusuf/j49hatk/71226323199.pdfIn PDF document text
    • https://ruvatekokero.weebly.com/uploads/1/3/1/4/131437102/ba90a631950463.pdfIn PDF document text
    • https://sorunamupojiwek.weebly.com/uploads/1/3/1/4/131407183/6201633.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/kavugusepe/formato_requerimientos_ieee_830.pdfIn PDF document text
    • http://luzafofefo.rf.gd/zigavo.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/giradewonenur.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/suzovesozomawi.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/gurod.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/vukuwikiwerumewov.pdfIn PDF document text
    • http://nidikofuwovi.rf.gd/99107531735.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/comptia_linux_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/17935166942.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/76830777061.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_off0000dfbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBC 5208 bytes
SHA-256: 826a49447fd12210811eab882144972ca77614089a2eb30f6d76f4bef06f7964
font_01_sfnt_off0000f16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16B 10536 bytes
SHA-256: 7a288aa7675a5910c7c13792b889f4b56c0445371c58ad53d596a2ef1fb4ec81

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