Malicious PDF — malware analysis report

Static analysis result for SHA-256 421a9b5ef5bacc6c…

MALICIOUS

PDF

81.6 KB Created: 2021-03-30 21:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b55b97740ff94e6cd78e9161d96f8b6c SHA-1: ca8fe5675bcc067f9e2ed2dcfa70427f4d9e300d SHA-256: 421a9b5ef5bacc6c0f3a7853d4c383440ced86fd3e9891576dfaa5ec45c211be
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, with a primary link to 'https://golowaki.ru/strik?utm_term=new+king+james+bible+concordance+online', suggesting a phishing or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, likely for further exploitation or credential harvesting.

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://golowaki.ru/strik?utm_term=new+king+james+bible+concordance+online PDF link annotation
    • https://cdn.sqhk.co/vivijuzajus/7ykje3S/edmentum_world_history_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/bapuparit/jhiWg2N/1424797309.pdfIn PDF document text
    • https://cdn.sqhk.co/gegojagakexu/eiglqig/xaroribujitifula.pdfIn PDF document text
    • https://cdn.sqhk.co/zegegajugot/4XiblZS/hearthstone_meta_report_august_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/26487256746.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/51243113265.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/26715298667.pdfIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_d6304a0c791b45efa212b11809d72a89.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/zuvetitijodofaruwazebof.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/absorcion_de_nutrientes.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/68030723660.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/sovajemomo.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/noviform_2_augensalbe.pdfIn PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_2279389bdaa04fcdafbef3b10c5cd5eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/27608714518.pdfIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_fef3b700b9d846c38a2f63c8b6f26eaa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59C 5308 bytes
SHA-256: d49c0bfcf9a8598be0b0c48a686c66c4a35734ae9ae9d84661d7e89e93d94463
font_01_sfnt_off00010796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10796 10384 bytes
SHA-256: fbe10b625a690d8962dd2c958c9944c023f8037ace29fdf8960b7ab48ac8ba2d
font_02_sfnt_off00012ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE2 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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