Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c99b896a3d4a5d…

MALICIOUS

PDF

67.3 KB Created: 2021-03-18 10:49:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4bcfc561b3c0372bc5884f4c6a0a3410 SHA-1: b76b2df7aeaab067ba00ede60d0e9f1c90423394 SHA-256: b1c99b896a3d4a5d9f5488fffce013884c7c3ba7f20367f431928d894300dbb2
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link to known malicious infrastructure and a large link farm. The embedded URLs suggest an attempt to direct users to potentially harmful websites, possibly for phishing or SEO spam. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://crophysi.ru/wix?keyword=bendix+king+radio+manual In PDF document text
    • http://lovupijuti.getenjoyment.net/57720089916.pdfIn PDF document text
    • https://suxobiras.weebly.com/uploads/1/3/4/6/134614615/mekizalavusoxitim.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/analytical_biochemistry_textbook.pdfIn PDF document text
    • https://cdn.sqhk.co/vumusokutil/Tigghj5/46893370986.pdfIn PDF document text
    • https://cdn.sqhk.co/badalozebale/hciaiZS/46414208923.pdfIn PDF document text
    • http://favosiwuvaru.iblogger.org/37373629383.pdfIn PDF document text
    • https://cdn.sqhk.co/besuduxikuvo/A2haeFp/real_estate_agent_lead_sheet.pdfIn PDF document text
    • http://motozed.scienceontheweb.net/encyclopedia_judaica_vol_4.pdfIn PDF document text
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/galor_wufowunesukale.pdfIn PDF document text
    • https://dogerisu.weebly.com/uploads/1/3/0/8/130874322/gajalawiwuwe-zuziremuxep-xaribufez-dadodowoxude.pdfIn PDF document text
    • https://cdn.sqhk.co/botikavanov/gejebhj/dragon_x_dragon_city_mod_apk.pdfIn PDF document text
    • http://jezepepaw.22web.org/13342988253.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisoritet/OOwgjhj/dujepelemewevutazibanasi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_64df5b20a733481e82b9d18e90710d5e.pdf?index=trueIn PDF document text
    • http://korofituzuxigu.onlinewebshop.net/good_books_to_read_online.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/diabetic_foot_ulcer_antibiotic_guidelines.pdfIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_08a041e59eed4158951b81f8c19a88e5.pdf?index=trueIn PDF document text
    • http://penugifo.rf.gd/mibobugivuzojodi.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/galarian_forms_ponyta.pdfIn PDF document text
    • https://b24036c1-08f6-4d5b-b8c9-f4c47f26e437.filesusr.com/ugd/ae9acc_a766ed05cdcd40289fe2559c8da2cdcc.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE2 5148 bytes
SHA-256: bc306c9c581375931a0f42f2253884b433ab9a5e6ff7864e0446c7d2c6d87a27
font_01_sfnt_off0000dc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC57 10532 bytes
SHA-256: 00452c79511841c393e05ddb7103b613ff00bf44f7f95472de0e5d0034c40820

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