Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e0bd57e4cb3fe1f…

MALICIOUS

PDF

98.9 KB Created: 2021-03-16 19:54:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f1aff489be45df9317765bbd4c47fbd4 SHA-1: a659c95239b3e56d5b98f1a83b3982659d9ae120 SHA-256: 3e0bd57e4cb3fe1f7c7485d69b3c951cad655bea8aebc43d8fdc6452a38474db
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded links, many of which point to disposable domains and known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to 'online cpr certification', suggesting a lure to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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 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://yafferge.ru/strik?utm_term=what+online+cpr+certification+is+best In PDF document text
    • http://zemesod.getenjoyment.net/wosapexesewalal.pdfIn PDF document text
    • http://net-klientov.ru/aramusha_guide_fradpfv.pdfIn PDF document text
    • http://lnstagramoriginal.com/malicious_software_in_information_securitynk4e3.pdfIn PDF document text
    • http://ppl-nutrshopfit.website/brinkmann_smoker_recipes_turkey7duai.pdfIn PDF document text
    • http://cybety.xyz/xawavego846.pdfIn PDF document text
    • http://hustlinmoney.com/ninja_pirate_assassin_hero_6_caribbean_ship_wardi1dr.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/fthjUFV/55864766529.pdfIn PDF document text
    • http://xatovapotogu.mywebcommunity.org/90238539409.pdfIn PDF document text
    • http://alcexpress3.xyz/29235577665yh4l2.pdfIn PDF document text
    • http://giwitap.getenjoyment.net/manual_citizen_eco_drive_e870.pdfIn PDF document text
    • https://cdn.sqhk.co/wezopexa/68ujgYc/online_shopping_sites_usa_electronics.pdfIn PDF document text
    • http://retapadu.medianewsonline.com/samsung_un65ju7100f_stand.pdfIn PDF document text
    • https://cdn.sqhk.co/dapumexader/aoaOpD0/97647753042.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lejiletuvasipib.onlinewebshop.net/nuradibexuworu.pdfIn PDF document text
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_40abff5bc5cd4fbd98d11f4aaeed910a.pdf?index=trueIn PDF document text
    • http://xijewixevav.onlinewebshop.net/54734066193.pdfIn PDF document text
    • http://rabatelekovufar.myartsonline.com/1530964086.pdfIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_263bf35db74942f696b1013ed7f11974.pdf?index=trueIn PDF document text
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_70d07a92be2441b08d230d633d1ed3fb.pdf?index=trueIn PDF document text
    • http://purezaviwof.myartsonline.com/us_bank_secrecy_act.pdfIn PDF document text
    • http://vuzuwukef.atwebpages.com/microsoft_word_two_documents_side_by_side.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_off00014684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14684 5256 bytes
SHA-256: 153170b23d4a143aa5a875e3c366ea92895828ed2d9ae31ec029ae7000bf7cdd
font_01_sfnt_off00015869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15869 10864 bytes
SHA-256: 33284cf3b40ed80d495d818d26e314e15822c83b8b786f6c64251f7f1587b46e

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