Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d4bbaa76ae6565…

MALICIOUS

PDF

81.7 KB Created: 2021-03-06 19:57:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0a4ff893bcc7f4b969b2e08c4dd73ee7 SHA-1: 56a44b2fcf14c0e2d92b3b331861e64c4f64e68f SHA-256: a3d4bbaa76ae6565d66bf1ea6ea9cdce21566ac197056ed6b46cb535a1fc5665
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://gimoguvi.ru/award?keyword=frigidaire+washer+dryer+combo+disassembly PDF link annotation
    • http://mosuxuvemuzuwex.mywebcommunity.org/how_to_clear_memory_on_hp_officejet_pro_8620.pdfIn PDF document text
    • http://beviluxenumiliv.mywebcommunity.org/what_is_the_average_salary_for_a_staff_auditor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401703/normal_6032d56d94393.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480904/normal_5feb81c6d2056.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492240/normal_602eb463ea489.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502511/normal_6037a1d8dd0cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471252/normal_5fdbd4d2c31c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455894/normal_603ba304d6a2b.pdfIn PDF document text
    • http://liwitesuzemumex.sportsontheweb.net/vistara_2_letter_iata_code.pdfIn PDF document text
    • http://nigodofifulo.scienceontheweb.net/93295553412.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494430/normal_602741c2da529.pdfIn PDF document text
    • http://zunuruxeguxifi.mygamesonline.org/30785481331.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_873021d95a1c4b46827f3664fc5a8b78.pdf?index=trueIn PDF document text
    • http://nukivamo.myartsonline.com/best_replacement_battery_for_ipod_video_30gb.pdfIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_b31b4395bab74be69ee18df5ce841b23.pdf?index=trueIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_45c8f2a44c9f4a58a7716e1bfd0f24ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/dibedopaw.pdfIn PDF document text
    • http://faxevimisosideg.myartsonline.com/50097984776.pdfIn PDF document text
    • http://nazowovemozugiv.myartsonline.com/wurizipo.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/42173129061.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/what_is_elementary_probability_theory.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_off00010260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10260 5644 bytes
SHA-256: 7eb91a21daa9b218c50e3bf3d659b94953ca01aef8dec8836b2439fd7344a631
font_01_sfnt_off00011580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11580 10476 bytes
SHA-256: c943ba7f0d522eea8956533e562ab19ffb6b2a743250cb9fa09fa1a941ae6a0b

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