Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8679671907a9a5c…

MALICIOUS

PDF

82.0 KB Created: 2021-03-13 17:27:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c4b70c7f6ad4798fb31f8a477713e9c3 SHA-1: 20d2aa3082b0987bd02a3bc84d1ea30dc7e1cca6 SHA-256: d8679671907a9a5c627561007680ee433e02ff4d58a45e529c85defb414764fe
126 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many pointing to disposable hosting, and the document body, though heavily obfuscated, includes keywords like 'antenna theory pdf' and references to wkhtmltopdf, suggesting a lure to external content. The presence of multiple external URIs and the link farm heuristic indicate an attempt to direct users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/award?keyword=antenna+theory+pdf PDF link annotation
    • https://cdn.sqhk.co/pubodegosog/bid2HX7/26079420563.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/ighwjft/did_you_know_facts_about_marine_animals.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368731/normal_602560e64d628.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418786/normal_5fd93cd01aaca.pdfIn PDF document text
    • https://cdn.sqhk.co/dajuzafum/jhN5xgh/nafedexiwe.pdfIn PDF document text
    • http://wusator.mygamesonline.org/98113584544.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529697/normal_6024630a4e6ba.pdfIn PDF document text
    • https://fijogukovope.weebly.com/uploads/1/3/1/3/131379832/dopabikaxa_forabenelefufa_vinasezubimoror.pdfIn PDF document text
    • http://kijekidajefi.getenjoyment.net/neil_gaiman_sandman_tv_series.pdfIn PDF document text
    • https://kagunalikabogow.weebly.com/uploads/1/3/5/3/135350350/mowoluna-nijuvumuzaxud-wesenepebo-bidopetifas.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/tdiaxgc/free_full_length_movies_websites.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416791/normal_6014dd4977af8.pdfIn PDF document text
    • https://besukobar.weebly.com/uploads/1/3/1/0/131069863/2794567.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rijemow.onlinewebshop.net/92332845929.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/background_car_images_hd_1080p_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b3c1766-d0ed-4878-8a27-6edb0ce1fb25/titulo_de_credito_direito_empresarial.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/the_rising_of_the_shield_hero_raphtalia_childhood_ver._1_7_scale_figure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35d3b340-27a8-4c13-ba66-b7b70cf2b347/kilotokar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3faed42-d996-4bd6-b587-970a2ec2eef9/does_medicare_cover_preventive_services.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/vojuriwokig.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/77604187854.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/gididuxibolakafekab.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_off00010626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10626 5008 bytes
SHA-256: 8835db12c70b73e4b8e5a70a803cbf956700fc08af8d40fb9582eb7d4c8ac5bd
font_01_sfnt_off00011737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11737 10484 bytes
SHA-256: aa4d23e2af615e4579a39f555e526c0f9bc6397102a36897df71606f75a17eed

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