Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f4248123fd005c…

MALICIOUS

PDF

81.0 KB Created: 2021-03-09 01:54:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5f0f3f805f8ed75f5a49880b81fff8bc SHA-1: 825e17e5fbd1d23dbd2e68ed28e6db39c40ec6ee SHA-256: 21f4248123fd005c760d2403f88e6ec97ea5f99e90d961ef7eda4d6c727d543b
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=what+is+a+good+diet+plan+for+athletes PDF link annotation
    • http://kojazunupetip.mygamesonline.org/which_wings_of_fire_dragon_hybrid_are_you.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472766/normal_5fe49fe767495.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473041/normal_5fda3bd55aa93.pdfIn PDF document text
    • http://zarewubizeno.mywebcommunity.org/80054577097.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475212/normal_6007ba146df95.pdfIn PDF document text
    • http://lirinevewafa.mypressonline.com/cuanto_es_1_93_pies_en_metros.pdfIn PDF document text
    • http://rijoginijamibeg.mypressonline.com/what_are_the_three_types_of_heat_transfer_that_occur_in_earths_processes.pdfIn PDF document text
    • http://gajonedorebuko.mywebcommunity.org/fujitsu_scansnap_s1300i_wired_usb_document_scanner.pdfIn PDF document text
    • https://cdn.sqhk.co/pujazojiwixi/zUeUKig/persyaratan_buat_sim_c_2019.pdfIn PDF document text
    • http://ridovise.sportsontheweb.net/85540339722.pdfIn PDF document text
    • http://zosuwalerikare.getenjoyment.net/90254399125.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/MLgfAjj/92948848332.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498997/normal_6037095389a3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422382/normal_5fe267c7a4219.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7dfda19-3733-48c7-b75c-958e86c647db/93184247859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47aca57c-3734-4912-bc2e-be49fd8672a3/35517167265.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f66eb760-e07e-4192-a680-578d54fe2d37/epson_powerlite_home_cinema_730hd_bulb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc9b4e6e-0444-47fd-be11-6fe988836bcc/postmodernism_or_the_cultural_logic_of_late_capitalism_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/mevuxiwulagakuga.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/best_shows_available_for_on_netflix.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/golekoromonitivo.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_off0000ff76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF76 5316 bytes
SHA-256: cc7c6dc9d70c5088349e28bdb5f2fdaee2df86eb016e3aaf2a73a28b5010d5f9
font_01_sfnt_off00011194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11194 10876 bytes
SHA-256: 6f8c005cafa6965aa6b85fae0ca376075517a1afcc140a45d08081d38eff5731

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