Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ee4490ff1184fc…

MALICIOUS

PDF

88.0 KB Created: 2021-03-17 05:54:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: afecc5176d0b022e02158a94ae9a73a3 SHA-1: 06980a1781c37df15e6400336192be5179c96596 SHA-256: 23ee4490ff1184fcf040b544b5f2a471fcba9a1bcba5a1d58ebf9d8a69b8b0ce
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and heuristics indicate it functions as a link farm, directing users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/wix?keyword=realidades+1+capitulo+9b+practice+workbook+answers PDF link annotation
    • http://doordash.fun/plan_de_estudio_de_la_biblia_reina_valera43z3f.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/qiiij3k/business_intelligence_social_media_definition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378620/normal_60111cd557d80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447450/normal_60013f1cccc45.pdfIn PDF document text
    • http://ductsunlimitedins.com/traktor_s4_costi8tdp.pdfIn PDF document text
    • http://tekdouche.xyz/championship_manager_01_02_insert_cds25rg.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/satupagofy6kz5.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/waNRsgh/online_spelling_games_for_high_schoolers.pdfIn PDF document text
    • http://merishwheelrecords.com/queen_size_platform_bed_frame_canadazo2zs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376625/normal_6035888be0d5f.pdfIn PDF document text
    • http://center-san.ru/48384658987ohd4x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://584dc5e1-4449-4bca-b3d9-d0e1fa08a972.filesusr.com/ugd/185caa_ad2827970eda46408d77ff001a54f65f.pdf?index=trueIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_3c11c931c5be40eaa9d518d56804b3a1.pdf?index=trueIn PDF document text
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_bafabacd91e14c4f9af239afa644cc7a.pdf?index=trueIn PDF document text
    • https://b66a6cc6-7028-4fd7-9d19-084b2b27c535.filesusr.com/ugd/4015cf_45fe3724797145dd9e913d066b5fdcca.pdf?index=trueIn PDF document text
    • https://770cee9b-59ea-4c2b-ae8d-aad83b0abb79.filesusr.com/ugd/8b25c7_b81ae0e18a744006978fbde9f9f20099.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F4 5580 bytes
SHA-256: e2aa5714531a05e1223de673cae50e837c3f149c4f01f8d12217a83839cbe81f
font_01_sfnt_off00011704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11704 1852 bytes
SHA-256: a2af1f685b55b0c685b8540f6ea4ed5b5fb980cec2d95065e4f58d89d6d1c452
font_02_sfnt_off00011fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDB 16616 bytes
SHA-256: fb3c6d1399b22bf5d48789effaccdf4357f59eb308cd2fd6226fa2f05f7625a5

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