Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c2578a77824906…

MALICIOUS

PDF

81.2 KB Created: 2021-03-27 15:04:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 937b8bd4b1d3ccd24856802e2992dfcc SHA-1: 11d611738733a27f127d6ea26255c973b6253de2 SHA-256: e4c2578a778249061bb41aba07b2a1cda1bbd1327c0696b9b41fefe1e1741b00
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://vilenefex.ru/strik?utm_term=bandura+social+learning+theory+citation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483082/normal_605b1e2c438c9.pdfIn PDF document text
    • http://evromotors.net/snow_like_ashes_meira_fan_art3y9r9.pdfIn PDF document text
    • http://dewisazovuvoxi.mywebcommunity.org/wuxevijamis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426823/normal_60485999be7d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403680/normal_60543ca5ce23c.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/when_all_of_the_authorized_shares_have_the_same_rights_and_characteristics_the_stock_is_called.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482623/normal_5fcfab4e6eecb.pdfIn PDF document text
    • http://twoup-viktoria.online/60502898494wfyuo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490265/normal_5fe04567aad06.pdfIn PDF document text
    • http://xuxijosut.sportsontheweb.net/complex_numbers_problems_and_solutions.pdfIn PDF document text
    • http://rewetuxavix.mypressonline.com/nosulexaziw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484639/normal_6051c48f6f118.pdfIn PDF document text
    • http://ita-bio.fun/split_second_sentencekcxmi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373520/normal_5fc61208b014f.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/ecf3ec2d-28a8-4435-bf8a-40b15de8848c/3910254509.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bef85e9b-83cb-4d23-b184-f451394df9cc/57312718133.pdfIn PDF document text
    • http://satogitexuvo.myartsonline.com/ardhanareeswara_stotram_telugu_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b35896d-1475-402c-b6ee-849774d30815/burger_king_breakfast_menu_specials.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4be048b6-bdd3-42b8-b0d7-aa9dabd855f3/what_to_read_for_sat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b81468a-b63b-4a38-9d81-e74523be441b/rokodoteveguxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/140538d5-3d20-4b85-9599-54489e5b1903/50971185073.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef660ce3-d5ac-4d6e-a148-169629f4a101/canon_mp250_driver_apple.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_off0000feec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEC 5352 bytes
SHA-256: cfec77b8af95ecf6b52d02ebedd733bda5ec882083f23886aafeaf2973a66fec
font_01_sfnt_off00011121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11121 11164 bytes
SHA-256: 1cedf661ea04a4dce01d9d75b990c52cc4df6bf1a2aab5a1887b8b44bb198ff0

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