Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8457595e044f00…

MALICIOUS

PDF

81.1 KB Created: 2021-03-16 09:08:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e193be84113f3279ac2c7b4bab788ca SHA-1: dcf7d4dbceb0a3c6abb3f734791a8a3aa431eb7a SHA-256: 4e8457595e044f00f189d9a21b96311cf9eb85c0324c14202014c094a17b5074
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly domains, suggesting a link farm or redirection scheme. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics indicate a high likelihood of malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest it's designed to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/award?keyword=asbog+exam+secrets+study+guide+pdf
    • https://dimafaxatabevex.weebly.com/uploads/1/3/5/9/135991177/sizavudipesupa.pdf
    • https://cdn-cms.f-static.net/uploads/4368756/normal_605022c3e6c98.pdf
    • https://joguxakiwemov.weebly.com/uploads/1/3/4/7/134707067/wegogitoto.pdf
    • https://fojifipavubi.weebly.com/uploads/1/3/4/6/134618349/1db021abaa0.pdf
    • https://cdn.sqhk.co/kitatoze/gjgcjc7/cheap_exterior_house_painters_near_me.pdf
    • https://mubajodopiwal.weebly.com/uploads/1/3/1/4/131454521/donutoxi.pdf
    • https://noxurawikatiner.weebly.com/uploads/1/3/1/1/131163986/riketo.pdf
    • https://cdn.sqhk.co/tivinarafuvu/ejbhevW/boost_mobile_recharge_reviews.pdf
    • http://xafopawiki.medianewsonline.com/briggs_and_stratton_450_engine_for_sale.pdf
    • https://cdn.sqhk.co/gutinisiv/j9hhjah/50530798697.pdf
    • https://static.s123-cdn-static.com/uploads/4530171/normal_5fce9668abc5e.pdf
    • http://wotukujis.sportsontheweb.net/81568588351.pdf
    • https://cdn.sqhk.co/giganopof/2jLp4Pp/smoked_cod_recipes_healthy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jifesu/affidavit_format_for_duplicate_marksheet_cbse.pdf
    • https://s3.amazonaws.com/besafefaf/dokukulakoralotekujimeb.pdf
    • https://s3.amazonaws.com/mijumomub/arlo_baby_user_manual.pdf
    • http://witesenigo.atwebpages.com/bahaya_boraks_bagi_kesehatan.pdf
    • https://s3.amazonaws.com/luramamelolem/instrument_voltage_transformer_connections.pdf
    • https://s3.amazonaws.com/laradusa/drupal_8_theme_override_template.pdf
    • https://s3.amazonaws.com/bomupi/educational_website_html_css_templates.pdf
    • https://s3.amazonaws.com/kudefem/ielts_speaking_part_2_template.pdf
    • https://s3.amazonaws.com/buganabowumujef/brisbane_tv_guide_free-_to-_air_tonight.pdf
    • http://xikusaduxofi.atwebpages.com/mosalusafuzagolodidu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc61.bin
704dde8a86412407a87c7095c4bcfc56deb0666c5c6c4d801b3876cc08794a51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC61 5744 bytes
font_01_sfnt_off00010fe7.bin
747f2bad57e34c7dcf8c26d843a17b04a19f6b95431a0ecc593ac7907f500fba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE7 10896 bytes

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