Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b16ff9f3e85817…

MALICIOUS

PDF

91.3 KB Created: 2021-05-07 06:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d58e2a2d6804bb886f0aecbdf450a2c1 SHA-1: 3f3e38dfdf66b4b7a9c4bb6ab35f6afe78a66792 SHA-256: b5b16ff9f3e85817cf138f8c0ea20cc0f1a0a2fb5e37b5ec75ca2dcd39fad470
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing sites, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=military+white+paper+format+example PDF link annotation
    • https://kexizinakit.weebly.com/uploads/1/3/4/8/134870698/wabigud.pdfIn PDF document text
    • http://amaryllis.space/corpus_christi_offshore_weather_report0h9kz.pdfIn PDF document text
    • https://filikegepux.weebly.com/uploads/1/3/5/3/135346592/8046114.pdfIn PDF document text
    • http://tersq.space/forotejin53.pdfIn PDF document text
    • http://blacktea.space/tarakavalupetifutapufrqtfn.pdfIn PDF document text
    • https://nazawerud.weebly.com/uploads/1/3/4/3/134353719/boxeminevuba.pdfIn PDF document text
    • http://scotiaenlineape-personas.com/the_lion_the_witch_and_the_wardrobe_movie_rating_australiar27v9.pdfIn PDF document text
    • http://varietystore.website/tuvujabifamowof9md13.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b917a0cc-3fa3-469a-87fc-01a1b8790955/blood_of_elves_audiobook_mp3.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/notewurusigimufuko.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/16761011696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4429f38a-e9a6-4276-b08e-772f5d90ba7f/seketuzesutexi.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/fevakinuzifobiz.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/gekiwelazomotejigejaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37ac95bc-25b6-4b0f-82b7-c2b72065d02a/99467048636.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/dudajoburavux.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/wizogiforalirasobaw.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/xisonevuwazakobutivinepo.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/kindle_fire_hd_7_2nd_generation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d8ba882-1e75-4734-b40f-2fc32016bc50/best_uchigatana_upgrade_dark_souls_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dae666e0-d3c2-4874-870a-fcbe767b7005/financial_accounting_journal_entries_examples.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_off00012948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12948 5232 bytes
SHA-256: 4f833bf5ded356a6f30cd2f7ade4a04f53358d9b1877508b3697726248f65233
font_01_sfnt_off00013b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0E 11008 bytes
SHA-256: c99e990b8d3fc10ac8194c0de7734db459299c056cee19e8808c879b9218e580

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