Malicious PDF — malware analysis report

Static analysis result for SHA-256 99623da36a3f0f3f…

MALICIOUS

PDF

79.8 KB Created: 2021-05-01 05:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4872c9ce3b012af0e9fbe98da51488d8 SHA-1: e673bea09a84f82ee175b6c8e9314e181c08825a SHA-256: 99623da36a3f0f3f29efcd86bf520dab4db55d3c922015cd517ffec6c66655ca
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a malicious link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

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/strik?utm_term=what+is+a+therapeutic+foster+carer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374857/normal_6052f9d33c6a3.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://zijogodakenanaf.22web.org/features_of_romanticism.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472775/normal_6052e5939a37d.pdfIn PDF document text
    • https://nitejaxerovon.weebly.com/uploads/1/3/1/3/131379530/mibanodezu.pdfIn PDF document text
    • https://mumerigowijegap.weebly.com/uploads/1/3/4/7/134771458/gamolimipip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446401/normal_600bf321c18ec.pdfIn PDF document text
    • http://gnoogle.site/ejercicios_resueltos_de_estatica_priaw3y4.pdfIn PDF document text
    • http://confirmationhelpcenter.com/additive_manufacturing_seminar_reportguqvm.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486981/normal_5ff3b2e5d3c7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403938/normal_5ffe983679913.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388827/normal_6061a2ce81695.pdfIn PDF document text
    • http://dihtyar.online/92990121657mg9ve.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484990/normal_5fc686123054f.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
    • http://kojumajofub.rf.gd/beverly_hills_chihuahua_movie_in_tamil.pdfIn PDF document text
    • https://eb22cd64-ba88-4d74-9269-d2b8937e52af.filesusr.com/ugd/3b217d_d6a21859552b4e54b7e9a4a6659f2bf9.pdf?index=trueIn PDF document text
    • https://8dcf3d85-40eb-4350-b789-ae6ac2c46e24.filesusr.com/ugd/21d17a_d43dae148ddb4689ad1adbbca2757d95.pdf?index=trueIn PDF document text
    • http://nuvebuxuloruvux.epizy.com/maschine_mikro_mk3_ableton_template.pdfIn PDF document text
    • http://kitutexedifepi.epizy.com/what_size_bullets_does_an_ar-15_use.pdfIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_a882f8247d90429a84c2c0e4f3f058ad.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_off0000ee8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8B 4860 bytes
SHA-256: 7bf3201c816726894eba4f33b58760f62e17b4498e7aacba3ae0e83d2b05dc1f
font_01_sfnt_off0000ff31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF31 10704 bytes
SHA-256: 14f36093480185c05204ef0095c5324a65bacd1196751b34b0f554331ba3b033
font_02_sfnt_off000123cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CB 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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