Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e4044f19a025049…

MALICIOUS

PDF

73.5 KB Created: 2021-01-28 00:55:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 75b5d77d0a0ddd0d5bc40f2e5eb0eff2 SHA-1: e2c2c337f2f794f7f4860cc57c0dd85ff4e40e67 SHA-256: 6e4044f19a025049fbb6eba1878fbc7a0390eab4e9c062e87ff0ef66c701aa21
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://maypoin.ru/123?utm_term=frp+bypass+apk+samsung+j5+download', indicates a lure related to bypassing device security. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

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://maypoin.ru/123?utm_term=frp+bypass+apk+samsung+j5+download PDF link annotation
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/1940094.pdfIn PDF document text
    • https://cdn.sqhk.co/wevafofed/6RCNuA9/bhojpuri_song_dj_2020_ringtone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495409/normal_5fcdf8ffbb635.pdfIn PDF document text
    • https://dojoxokixen.weebly.com/uploads/1/3/4/8/134878929/7510034.pdfIn PDF document text
    • https://cdn.sqhk.co/xifusajexom/dLzlgc3/8648449997.pdfIn PDF document text
    • https://cdn.sqhk.co/jisaside/ggfTI3C/top_100_golf_courses_by_state.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489724/normal_5fe8f2dbe794e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394061/normal_5fd2028324a8d.pdfIn PDF document text
    • https://cdn.sqhk.co/girolivudafo/jdihbib/archivo_para_tener_skins_de_among_us_gratis.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/fedure/epileptiform_activity_eeg.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/93864490054.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/general_ledger_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/49245405544.pdfIn PDF document text
    • http://bumumewevebav.epizy.com/casio_fx-_5800p_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/fizavaraz.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/65449638891.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/leave_request_form_template.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_off0000e167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE167 5832 bytes
SHA-256: fc8d22d5b0f0c58f54c12c817ccba9f52a26f02e7894d145353bdc9eba33f2f8
font_01_sfnt_off0000f545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF545 10364 bytes
SHA-256: b5e0961ced4099bf499327d894b6b2bad6898fdf9e87c161508548873e06e26b

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