Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c269c24a997bd4…

MALICIOUS

PDF

74.6 KB Created: 2021-03-30 01:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 897880347f6a4faefc37588b39ddcae7 SHA-1: d73f2ab1440eeac1971ba1e497771947bd5a3e97 SHA-256: 82c269c24a997bd4ebfa3cfe769f971fe6cf04c85547f94edab6e04fb7f4ec3f
156 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 0.9998

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 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.
  • 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/wix?keyword=redifer+commons+psu PDF link annotation
    • https://nuzotononi.weebly.com/uploads/1/3/4/0/134012627/900d41c.pdfIn PDF document text
    • http://czecheducation.space/nomolotivepejinubogilo7xn59.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461791/normal_5fcf7b3fd56db.pdfIn PDF document text
    • https://fuvipizewovotat.weebly.com/uploads/1/3/1/0/131069886/tafadenetoru.pdfIn PDF document text
    • https://bosudire.weebly.com/uploads/1/3/4/4/134456289/7525828.pdfIn PDF document text
    • http://kyponnik.online/hernia_inguinal_pediatria_2010www9h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481280/normal_6034f77305a0c.pdfIn PDF document text
    • http://korecos.ru/how_to_get_better_fitness_for_soccerff3nw.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/8acd5c1f-203d-429a-9f3c-ac77709cd7c8/pigal.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/osteoporosis_tratamiento_2015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30b658f8-2a6f-4429-a9cb-810dee0904e1/are_coby_earbuds_good.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/autocad_plant_3d_2019_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/kezunizekusunolirawafa.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/how_to_find_vif_in_stata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d673ff8-f293-4b32-bda5-9bd36a530358/lightweight_portable_shooting_bench_plans.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/systems_biology_book_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/how_to_pair_ge_universal_remote.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_off0000e6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C1 5064 bytes
SHA-256: 13b1e4c5b72722b5ad792733b067caa7eb9096fd2554f0c6bb7332694d8a2a4d
font_01_sfnt_off0000f7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F3 10848 bytes
SHA-256: 517d117fce2344d02e86c49c8dd54ac2d526c4f2fa775d216337af290a7d5a7f

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