Malicious PDF — malware analysis report

Static analysis result for SHA-256 4635c5f1b6074ad5…

MALICIOUS

PDF

77.5 KB Created: 2021-04-05 13:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3208936505486ec19187a87ee29a99cc SHA-1: b9fc312ac606ada2a57aeb0969c495a2bccfaf63 SHA-256: 4635c5f1b6074ad5a332ea826ae13a6ba45a70d978ee3fbb9e52b31818a38935
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 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

  • 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://leonvi.ru/wix?keyword=dna+and+replication+worksheet+answer+key PDF link annotation
    • https://cdn.sqhk.co/sotatixorawi/jeXiegd/99630994559.pdfIn PDF document text
    • https://cdn.sqhk.co/mibazudifij/bjchak0/bilaxolediponajikanulavov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443608/normal_5febf8352f3cd.pdfIn PDF document text
    • https://cdn.sqhk.co/dozirerom/KhdkoAl/famous_quotes_about_love_at_first_sight.pdfIn PDF document text
    • https://cdn.sqhk.co/juzilolawu/OXibjhs/gagavefutamis.pdfIn PDF document text
    • https://cdn.sqhk.co/jawafurovif/bjfxie5/guzowalajadatu.pdfIn PDF document text
    • https://cdn.sqhk.co/tezizejaropu/IcjfhjJ/how_to_draw_cartoon_zombies_step_by_step.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_6044d8bfc5188.pdfIn PDF document text
    • https://cdn.sqhk.co/datimemovuko/wia5BCG/xalam.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/lijopavexanuse/que_es_la_musica_popular.pdfIn PDF document text
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_ae91775f897045588996622ef198ed65.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/punurum/resume_template_builder_with_photo.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/senna_guide_mid.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/canvas_painting_stand_name.pdfIn PDF document text
    • https://933527c5-e005-4225-a3aa-05fee46c7696.filesusr.com/ugd/b51dd5_6ccab84b112148e89d927214bfff48d3.pdf?index=trueIn PDF document text
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_98166bf1b03142f891a5d235a8d19487.pdf?index=trueIn PDF document text
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_2365d090532b494f9e41bf0088d8a6d8.pdf?index=trueIn PDF document text
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_40c71d2f6fa645f3a1972c89abfab4c4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/ruvazixurodujiladi.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_off0000f281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF281 5416 bytes
SHA-256: 0acdc3afe3345e21c9fec8a16b93f3c5604ebb69c7cfb1eff866342e6a1c56ff
font_01_sfnt_off00010502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10502 10496 bytes
SHA-256: 146725df2f06fd57d7570480826f90ddebc38318564fdb043ebc80d13d840f99

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