Malicious PDF — malware analysis report

Static analysis result for SHA-256 79de412acb483556…

MALICIOUS

PDF

75.2 KB Created: 2021-03-19 11:26:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5760d6042331a4a9605fccbc1b835db8 SHA-1: 5aa8f25c10b18e68c7abc16b8db35e97db811010 SHA-256: 79de412acb483556bb6eeb8dc80dd7d01b6590ea4f12c994df5f0b424762d5d2
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://druttle.ru/strik?utm_term=how+to+become+a+part+time+graphic+designer PDF link annotation
    • http://freefire-gifts.com/free_invoice_template_for_services_providedm7yzw.pdfIn PDF document text
    • https://mexepefavofuj.weebly.com/uploads/1/3/4/6/134659137/xatisuvoma.pdfIn PDF document text
    • http://tersq.fun/17217559470gines.pdfIn PDF document text
    • https://cdn.sqhk.co/kisasizaro/gNWiwib/59310762134.pdfIn PDF document text
    • https://pinukavuzufov.weebly.com/uploads/1/3/4/3/134307945/kejaluzuzudiko.pdfIn PDF document text
    • https://gopadafuwidu.weebly.com/uploads/1/3/0/7/130740623/pujuxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452609/normal_5fe238785a5e4.pdfIn PDF document text
    • http://oneitshop.pro/88459271426cjm3m.pdfIn PDF document text
    • http://helpcenter.business/pimup06ec3.pdfIn PDF document text
    • https://cdn.sqhk.co/kefekawit/xhaNqgi/jekupelutumelif.pdfIn PDF document text
    • http://whitetwo.space/zogobevubilifcb6jc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465908/normal_601847e59ac19.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/kUzhsqr/english_lesson_plan_template.pdfIn PDF document text
    • https://kiniwotonupit.weebly.com/uploads/1/3/0/7/130776343/9431178.pdfIn PDF document text
    • https://dopatojibeforu.weebly.com/uploads/1/3/0/9/130969701/8376087.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/iggdhga/kobe_mamba_apparel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/jepelof.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/fakabozimugejiwidimeb.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/fire_and_water_games_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/malachite_green_formalin.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/aves_sin_nido_descripcion_de_los_personajes.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_off0000e7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DF 5648 bytes
SHA-256: ee710fa7c224c50b593ee2f5ad3b87465246e3c0ab45acf83f8100bc968e3b91
font_01_sfnt_off0000fae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE9 10688 bytes
SHA-256: f73373f7d2c12b83b5336a6982fb63a693a089aefbd08b103c8d4ca18b511566

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