Malicious PDF — malware analysis report

Static analysis result for SHA-256 c464849cab771a09…

MALICIOUS

PDF

63.8 KB Created: 2021-02-17 07:38:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7eac21ba0de245a774a6df6ae71ad493 SHA-1: ad200abf1ad1807df1045f4486b8959928ef2eb9 SHA-256: c464849cab771a099856e41b2860855131cdf3b26f9b946ade01767e6daf295b
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary suspicious URL pointing to a domain associated with phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, suggesting an attempt to obscure malicious activity. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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 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://maypoin.ru/wix?keyword=reading+a+pay+stub+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/rijomawonuj/gGihjh2/metivugovinufumijanufo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393489/normal_600be27e785db.pdfIn PDF document text
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/zidazexu_pakojadipejosik_tiwolaxoxewo.pdfIn PDF document text
    • https://cdn.sqhk.co/nobukomorur/hiFhaM1/divarication_definition_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/pibepufas/inhfz8d/60256913296.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478146/normal_5fc7ea2976288.pdfIn PDF document text
    • https://cdn.sqhk.co/numorolele/jdMhfQA/15959454861.pdfIn PDF document text
    • https://baxukeze.weebly.com/uploads/1/3/0/8/130874478/a641ac9b.pdfIn PDF document text
    • https://miwidikanizi.weebly.com/uploads/1/3/4/0/134016908/wasula.pdfIn PDF document text
    • https://paxowamowutujaf.weebly.com/uploads/1/3/4/3/134322095/9e92aea37fdfd.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/lomogas/13259392938.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/lotakojijetuviru.pdfIn PDF document text
    • http://verirajoxa.epizy.com/vector_ornament_coreldraw_format.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/11041370052.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/salary_financial_reporting_accountant.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_off0000bdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDFC 5592 bytes
SHA-256: e1f788775f6071bf70a3697c0d8158c101b7c8d63df5801a8702d09bbc4ba42e
font_01_sfnt_off0000d11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11C 9776 bytes
SHA-256: 5392bae3af53b2efdc2c5de4ef5e65c8efddd1f7423a2cf937e81075a878529d

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