Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4aff4b4c25f5644…

MALICIOUS

PDF

76.6 KB Created: 2021-03-30 03:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9c73680a4f000fd23b55453298accf80 SHA-1: 56b228a88663e876703d9aefe60dfda6da6bafe1 SHA-256: a4aff4b4c25f5644e1a6b46e9e7f41be437fedbf02d5420e38217024883c5ed8
156 Risk Score

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://mezovuduw.ru/wix?keyword=cs+136+harvard PDF link annotation
    • https://cdn.sqhk.co/tesikotuk/hbgd85T/63189255309.pdfIn PDF document text
    • https://cdn.sqhk.co/solumapidema/RIpB5Jc/waste_canvas_cross_stitch.pdfIn PDF document text
    • http://fikosarodone.medianewsonline.com/mini_cooper_service_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/jenetuwuda/vgMomhb/lomakuf.pdfIn PDF document text
    • http://makelemeg.mygamesonline.org/degopezizi.pdfIn PDF document text
    • http://sovumeriwox.mygamesonline.org/apoplast_and_symplast_pathway.pdfIn PDF document text
    • https://cdn.sqhk.co/worenora/Rhj3fgc/draughtsmanship_courses_in_mauritius.pdfIn PDF document text
    • https://cdn.sqhk.co/fevazufalul/fQKMhh3/88758457025.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/dopugaxelelema/alternate_interior_and_alternate_exterior_angles_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/natewared/heelys_shoe_size_guide.pdfIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_86b492ab3cb94e9da2477992f0848454.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/latufenaw/cell_phone_advantages_in_tamil.pdfIn PDF document text
    • http://vutogebufuz.myartsonline.com/grammar_exercises_for_high_school.pdfIn PDF document text
    • http://xikusaduxofi.atwebpages.com/franz_kafka_before_the_law_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/borussia_dortmund_real_madrid_4-_1_formazioni.pdfIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_4056643297a84b3c8161cd318af4078f.pdf?index=trueIn PDF document text
    • https://3789e5f8-265e-48cd-8836-241a044b7ceb.filesusr.com/ugd/45ef7e_3a0fa2ff89c6431bbaa906dedbb11f34.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tinezedu/38389485799.pdfIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_e88a4713c23b4638b8b80a7b565c4e31.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA6 5216 bytes
SHA-256: e5d40402047c30ef449d57c2e5ce84b5b6f278538e4b61486ec9fce64b15a1c0
font_01_sfnt_off0000fe5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5E 11252 bytes
SHA-256: f6b18d4a7c6c2eaaa8084c6a618af9386565d2b4c6c33fc38bac1da9cea0ad68

Open this report in the interactive analyzer, or submit your own file for analysis.