Malicious PDF — malware analysis report

Static analysis result for SHA-256 77eeac19ae815050…

MALICIOUS

PDF

76.0 KB Created: 2021-03-29 00:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 27218c2c8eed0bb5ee94ad8de07a3fcb SHA-1: 20efae64b9a9953975bf930ffe932a2c360d2d80 SHA-256: 77eeac19ae81505003dab308355f7212f391370264b85b2bcbcf0c1f41fc3081
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 0.9993

Heuristics 5

  • 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 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://botokaw.ru/wix?keyword=geometry+proofs+worksheets+two+column PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466165/normal_604e8abebd93f.pdfIn PDF document text
    • https://cdn.sqhk.co/tunuzasana/icgcLgc/20517697243.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485573/normal_6038776109297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413455/normal_60526edeab512.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386084/normal_5fda46439e972.pdfIn PDF document text
    • https://cdn.sqhk.co/teduwugevoki/hfLAche/6154710453.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412378/normal_6009d5b63e1c2.pdfIn PDF document text
    • https://cdn.sqhk.co/kakapoxavu/jjaY1gq/42950296774.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/vojapu/fedumewijarutewajalogipu.pdfIn PDF document text
    • https://543e2b4d-9699-46d2-9656-875e860b8e63.filesusr.com/ugd/fb32d0_8818b5709e014a6a9ff7e1cdfac97b07.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sizabo/97130223848.pdfIn PDF document text
    • http://tuzugewidided.rf.gd/vidmate_apk_hd_video_er_2._42.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/vivetevipowef.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/nuevo_formato_certificado_de_origen_tlcan.pdfIn PDF document text
    • http://vupikefugogulup.epizy.com/32290061550.pdfIn PDF document text
    • http://nixedorufimidax.rf.gd/foramsulfuron_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/pathfinder_player_companion_alchemy_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/vinimejirerifutaru.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/how_to_turn_on_schwinn_270_recumbent_bike.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/should_internet_be_capitalized_uk.pdfIn PDF document text
    • https://03234a85-d811-4a68-a1f9-f7315bf9ccb2.filesusr.com/ugd/079591_1f191663433d4901910ee4adf82f5f3b.pdf?index=trueIn PDF document text
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_8ca519cfcd5d47aa9c68c1c40802a1ff.pdf?index=trueIn PDF document text
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_50ac3d2cd9c1487ca53a51ea30bafc81.pdf?index=trueIn 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_off0000e935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE935 5332 bytes
SHA-256: 66c67cabce34fc2fbfe88583ca737672339c6bc79a094087c17e33c54041b6ac
font_01_sfnt_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 10936 bytes
SHA-256: f23e4337f0582c54855fe0cbb159cd4b72328e8b62473441c34efab02b5c0a12

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