Malicious PDF — malware analysis report

Static analysis result for SHA-256 40689a741a8a324c…

MALICIOUS

PDF

78.5 KB Created: 2021-03-15 12:30:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 157d31d34e8e2e2edbc85d456815d353 SHA-1: b1cafb662e445d0e988a390faeeb8f05ad54bda3 SHA-256: 40689a741a8a324cfdfd8c31ee30088399c287a4f3f20dbf24c5c4721b70cd00
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://bologen.ru/123?utm_term=bandhan+bhojpuri+song++video PDF link annotation
    • http://priz24.site/85361178263lz097.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366351/normal_600f397fbfa7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474759/normal_6041f19d4142e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470380/normal_601b6c7bef04e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476593/normal_5fff68a56f778.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420034/normal_602230baae7cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407777/normal_5fcbd86283a3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401540/normal_6018be2dc1e09.pdfIn PDF document text
    • http://form-lnstagramcopyrightservice.com/what_does_it_mean_when_my_sister_dreams_i_am_pregnantj81y4.pdfIn PDF document text
    • http://ru-order-687646765445.art/cisco_ccna_learning_resourcesqfvqt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407664/normal_6006c7c1bafef.pdfIn PDF document text
    • http://fallofelin.online/economics_book_12th23ogm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479224/normal_5fcb9627af3d7.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/bisiku/alfresco_community_installer.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/how_to_tell_if_my_ac_has_a_dehumidifier.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/auditoria_contabil_livro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5ef5748-8fb5-4b70-a0a4-25c37a7e33db/danupinulijisejew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbad3f2e-6cbb-4721-9061-0d8eac8a83da/jubona.pdfIn PDF document text
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_9a24dee1cbf44f1b823dd8bab2160660.pdf?index=trueIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_18a6a83e9f964c44a81598f21c85ff39.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zesixefe/amharic_alphabet_in_english.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_off0000f27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27A 5516 bytes
SHA-256: 3c7c51a88b488e410623b78c2cdafeca3e159ea413ea4e2df1289e373edb3276
font_01_sfnt_off00010537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10537 11716 bytes
SHA-256: c9db812d3ad552aaa4e8b822147015ba797d7f25ada228d5e7af376cf31fc6f9

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