Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dd936b0959e0225…

MALICIOUS

PDF

72.4 KB Created: 2021-04-18 01:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d4c391a534ea3dc100cd4e239beebe1f SHA-1: 10bc7e4bf1329e634b799519b9e18656cdc07f34 SHA-256: 2dd936b0959e0225382a143a488be271755901f4ba5f43ef313bff0f6ec2f5db
134 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 and presents a deceptive download button. 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/strik?utm_term=integrated+chinese+volume+3+textbook+4th+edition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379733/normal_6042e1915c555.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/severe_birth_asphyxia.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/mecanica_vectorial_para_ingenieros_estatica_10_edicion_beer_espaol.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonotiso/xdfcGjf/57350136098.pdfIn PDF document text
    • http://ganoget.scienceontheweb.net/clinical_pharmacy_and_therapeutics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481173/normal_601e6949f182e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501654/normal_603e78bf6cfe0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471082/normal_5fd636459232c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392667/normal_5fe3eb6b4380c.pdfIn PDF document text
    • https://cdn.sqhk.co/winelolibug/ZSUiQij/3d_ping_pong_game_unblocked.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pekomuvave.myartsonline.com/911350490.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/what_is_programmed_cell_death.pdfIn PDF document text
    • https://5fa60de5-32ab-41ac-ba65-77330e21e623.filesusr.com/ugd/2e16aa_44dc97a0591445cb9435925c349b15e8.pdf?index=trueIn PDF document text
    • http://xugomoxuniwemo.rf.gd/guitar_chords_book.pdfIn PDF document text
    • http://xiniwipilanaju.atwebpages.com/dabedofusepofinosepuvu.pdfIn PDF document text
    • http://nuwiron.rf.gd/binomial_distribution_worked_examples.pdfIn PDF document text
    • http://luneruletiz.rf.gd/act_practice_test_2020_15.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/48564575209.pdfIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_61215be7e46d4e2c8ee4b247a76e679f.pdf?index=trueIn PDF document text
    • https://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_01c98449df864210b2871d75e76ee578.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/18_kriya_yoga_poses.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_off0000d87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87A 6088 bytes
SHA-256: 3d96ca6294b3ffccc53989fca8e49270502961305f7cb8441da514bba95083e8
font_01_sfnt_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 11384 bytes
SHA-256: f20eeac02fd642053392e93a3becacd9f3622644cb47bbe06e896b3b7d6abdd9

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