Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f5c8bd7b0a7563…

MALICIOUS

PDF

79.3 KB Created: 2021-04-29 05:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d726b45db35c6e47b63a0edef62b589f SHA-1: 2f5fe885b3ec880051fc9ae3dcfb27c7a8f65afe SHA-256: 40f5c8bd7b0a7563a593385e2a3f38b031ff48d42e669d26215b9733acbe6c57
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://nipisod.ru/strik?utm_term=how+do+you+calculate+exchange+rate PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387582/normal_600128db573d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401723/normal_600abae930fbb.pdfIn PDF document text
    • http://bejisosubonito.sportsontheweb.net/how_much_is_carlton_cole_worth.pdfIn PDF document text
    • http://gepanukotex.getenjoyment.net/steven_pinker_enlightenment_now_summary.pdfIn PDF document text
    • http://sushibara.net/648321588898tjpi.pdfIn PDF document text
    • http://copyrightviolationcenters.com/todd_wilbur_top_secret_recipes_full_episodesh1q7h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500878/normal_606497c6df0a7.pdfIn PDF document text
    • http://tophomework.space/tuwigikegomotovusosivu9jwrt.pdfIn PDF document text
    • http://usechambre.xyz/73545039381tqph4.pdfIn PDF document text
    • http://hookup673.site/frigidaire_mini_beverage_refrigerator_walmartt6m5u.pdfIn PDF document text
    • http://life50it.pro/gusoxarimigoxuzolejizaerrsf.pdfIn PDF document text
    • http://otshelnik.net/19489827050z40w0.pdfIn PDF document text
    • http://bitjoms.xyz/61125569129d6ag5.pdfIn PDF document text
    • http://ses-sanobrabotka.ru/how_to_choose_a_baseball_bat_for_high_schoollmhig.pdfIn PDF document text
    • http://zanapipok.getenjoyment.net/guion_para_cine_documental_carlos_mendoza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392862/normal_6030d9c289744.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://visugog.myartsonline.com/ketapulavinumupugoxeruzu.pdfIn PDF document text
    • http://muzulozak.atwebpages.com/cacti_and_succulents_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e3c7774-c03a-49dd-87ee-0da43ebd39d4/work_from_home_technical_writing_jobs_in_chennai.pdfIn PDF document text
    • http://gegilifopom.myartsonline.com/kissing_booth_book_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92ec0f73-b3da-4986-9120-1c295905a9ca/nudomagedi.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_off0000f71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71D 5248 bytes
SHA-256: 895b46cbb9662317284b77aafcf77aeee2bc6077812236f9e3dc0b22c04d0e3e
font_01_sfnt_off00010909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10909 11384 bytes
SHA-256: 48bca6034a9b8a94667a2faed0608f7444e60c1427bec236d494c27bb8ed1693

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