Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ead1f60cc0e8f07…

MALICIOUS

PDF

84.1 KB Created: 2021-05-13 10:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 624ff91c3888a6156d5f7233b7fdac12 SHA-1: 64fa93050274e951e39fefc2595f44e31e378a17 SHA-256: 3ead1f60cc0e8f071f196970c6fea2a5fd4fc2b05169b7d6d5013bac00b4e8aa
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs and the document's structure suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/strik?utm_term=cardiac+failure+drug+list PDF link annotation
    • http://gikikobudip.22web.org/the_prehistoric_archaeology_of_ireland.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467950/normal_60279038aeaff.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/i5iaifR/xukaxitomanuge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388040/normal_5fe789d741c5d.pdfIn PDF document text
    • http://gopubewigofopa.iblogger.org/wunefozujitiri.pdfIn PDF document text
    • http://tadiminag.22web.org/list_of_regions_and_provinces_in_the_philippines.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/ccgiAia/simple_business_accounting_software_for_mac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494893/normal_601bb909b6c73.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/glkiijh/37947139217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378628/normal_601f6b1a753b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468261/normal_602d779276d74.pdfIn PDF document text
    • https://cdn.sqhk.co/savekedeg/Bjg9ha2/gymnopedie_no._1_cello_sheet_music.pdfIn PDF document text
    • http://telewapor.22web.org/how_can_i_search_a_scanned.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477658/normal_605c60e79082e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tosodesuvivat.epizy.com/sewag.pdfIn PDF document text
    • https://94db4134-5784-44c5-a63d-963e509970fa.filesusr.com/ugd/9c58c5_72e6565efda7416daa59304d8f363ef9.pdf?index=trueIn PDF document text
    • http://zenujasope.epizy.com/amon_amarth_full_discography.pdfIn PDF document text
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_1b3001922b2d4b3aa9af1949e5c25d97.pdf?index=trueIn PDF document text
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_4882195b67d64d0f88eeff7ec269566b.pdf?index=trueIn PDF document text
    • http://mowadavukusut.epizy.com/41420387082.pdfIn PDF document text
    • http://lobejafunogule.epizy.com/uppcl_previous_year_papers_for_assistant_engineer_electronics.pdfIn PDF document text
    • https://901b9152-9067-49c5-8541-bb90c1a77dfa.filesusr.com/ugd/5d84e8_c2ee0482e0d24d0eaefdfdb049e992c8.pdf?index=trueIn PDF document text
    • http://filogipopema.epizy.com/acrobat_reader_and_editor.pdfIn PDF document text
    • https://933527c5-e005-4225-a3aa-05fee46c7696.filesusr.com/ugd/b51dd5_7dc806d823f74eb881688b8f5a9ea710.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10016 4876 bytes
SHA-256: 4f4b349ec5b4d2bed8a09ce0c9b09d7a309f1994309ac3beb8d6603c3a2a2e2e
font_01_sfnt_off000110c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C4 10672 bytes
SHA-256: 7e2b48a5a498ed2c45164d2cd578d5f51dc0cddbe3960a5322d86f3c2cd67ea6
font_02_sfnt_off00013520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13520 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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