Malicious PDF — malware analysis report

Static analysis result for SHA-256 69a8fda71dbd4741…

MALICIOUS

PDF

79.7 KB Created: 2021-02-24 13:45:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 85d2982941bfdf08d5941351d2d52feb SHA-1: 4e7cf627c9cece1df9ce86e97c4fa57ecc364112 SHA-256: 69a8fda71dbd474194d5a49fcda53be4f9a34ce6d0579a214b782993b2552936
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a prominent one leading to 'maypoin.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF's structure is designed to host multiple links on disposable domains, reinforcing the malicious intent.

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 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://maypoin.ru/strik?utm_term=los+mejores+cursos+de+ingles+en+youtube PDF link annotation
    • http://swiss-gear.shop/difazexaraxojudozawa6j1lf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485698/normal_601d5eba3f007.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/Dqiidjc/fulumu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426832/normal_600c7a368a374.pdfIn PDF document text
    • http://livethailand.fun/141508290114so5l.pdfIn PDF document text
    • http://mirror-x.org/78607467243szm7t.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/ctEib2A/spectacle_definition_aristotle.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408598/normal_5fdb65b8360d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451760/normal_6030871c2c408.pdfIn PDF document text
    • https://cdn.sqhk.co/dorejewibiz/mDjhhaB/cloud_bubble_shooter_game_download_apk.pdfIn PDF document text
    • http://pasozabijegigus.iblogger.org/55118489768.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499283/normal_5fe8923a9e00d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366628/normal_6035ba25b45c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450340/normal_5ff0b66185c02.pdfIn PDF document text
    • http://tk-time.site/informagiovani_macerata_lavoro54f82.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/nojemi/raci_matrix_excel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/kajunizaxetavu.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/pusenedeva.pdfIn PDF document text
    • http://robavumu.rf.gd/durga_saptashati_path_vidhi.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_off0000f8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F8 5308 bytes
SHA-256: bc0d1164fb6c496b158158f99f2ffca341614635f0ba8fb119de693f2538f869
font_01_sfnt_off00010afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFE 11256 bytes
SHA-256: b0ecf84448bae62f07ca8ef3e9aa45c909291296117bc23941c56945255fd3e1

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