Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cf2076748398de…

MALICIOUS

PDF

77.7 KB Created: 2021-03-12 09:41:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 129c5c0155c09ee79130bf50b1d0f8b1 SHA-1: 10e98f1ec7fde5880c2008d79d11f7025d8e20bc SHA-256: a9cf2076748398de66e21655277cbf4bd885dec18ee7f1a8b767c0935d0f9103
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to suspicious or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware delivery. The document body, though heavily obfuscated, contains keywords related to the embedded URL, suggesting a lure to a fake resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://dugedepap.ru/award?keyword=symbolic+logic+carroll+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453098/normal_60350b185c5cc.pdfIn PDF document text
    • http://help-feedback-amzn3.xyz/sotinukimonejemabazorupp81c.pdfIn PDF document text
    • http://mebets.xyz/typical_exit_interview_questions_answerscvqx9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402960/normal_6031ae8fba76d.pdfIn PDF document text
    • http://misiliv.66ghz.com/blade_inductrix_pro_betaflight_settings.pdfIn PDF document text
    • http://bazis-rostov.com/555006056896ivxy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484370/normal_6041b972a1a6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421466/normal_5fc886fb9fc57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463300/normal_60249be5c7517.pdfIn PDF document text
    • http://grinallex.shop/i_too_sing_america_julia_alvarezfscsl.pdfIn PDF document text
    • http://wekeb.space/jinoditulasix9598.pdfIn PDF document text
    • http://tevoriveterusof.22web.org/72572320162.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/fc78aac0-ca56-4b02-9569-101be113850f/fudge_a_mania.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/77917195311.pdfIn PDF document text
    • http://lotawopobakitab.epizy.com/survival_of_the_fittest_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/345b8c3d-015a-45af-9650-7ad7f24d4a22/suwugimamofakuvure.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/98422535280.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/nifujewabazeve.pdfIn PDF document text
    • http://gegenig.epizy.com/14887338155.pdfIn PDF document text
    • http://zekufimukewora.rf.gd/rasanofefu.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/centos_6._9_iso.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_off0000f0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B5 5640 bytes
SHA-256: b56d63a52c6615f0eedd8501a000bd28ab9be390b8da92c1a0ca079d545a2ace
font_01_sfnt_off000103d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D8 11288 bytes
SHA-256: 859568423f153c231c72498ce4b74ff911749c7fcc26224713040c9b836d2725

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