Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d2593f3cfffe427…

MALICIOUS

PDF

75.6 KB Created: 2021-03-12 10:33:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 210803db894543f21158ba6da2825b9e SHA-1: b2be5aae44e58c294af51094f56a81277b60c6ac SHA-256: 2d2593f3cfffe4271bcd40f796ff9a0bbff0c9250dfefbc0571e6e87565f282d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying the document as a link farm on disposable hosting, likely to obscure the true malicious destination.

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://xezojetit.ru/award?keyword=maniac+magee+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4500887/normal_6006efdea956e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448129/normal_6033bddb13e14.pdfIn PDF document text
    • http://zabavnyi-slon.ru/m1083a1_technical_manualhwsrg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369923/normal_60468263628e9.pdfIn PDF document text
    • http://construt.site/sesajrpbn7.pdfIn PDF document text
    • http://wowitaly.space/zasadomokufodepegisatekajt4oj.pdfIn PDF document text
    • https://cdn.sqhk.co/lixejudazeza/dPiaibX/katitesitolowawozud.pdfIn PDF document text
    • http://amst-watch-v1.club/man_search_for_himself2bnq3.pdfIn PDF document text
    • http://profaudit32.ru/mejofuxixemokujoxagobexac7wzb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408599/normal_6029ac35b7a4c.pdfIn PDF document text
    • https://cdn.sqhk.co/fomeluxilim/thaihhb/dufupotozinidib.pdfIn PDF document text
    • http://verification-help.com/how_to_print_with_hp_deskjet_2620axgh5.pdfIn PDF document text
    • http://legionmone.xyz/what_is_a_return_of_service_agreement31xvx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405409/normal_5fd8cfb05bad7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447640/normal_601bd105438ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366324/normal_5fcf9bff283e8.pdfIn PDF document text
    • http://casserlabs.xyz/bunuxazigepibovubrze2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5366dd3f-28a3-4342-b8e5-5bed86455aec.filesusr.com/ugd/a92322_236cf471519c4c339ac8e87928e63029.pdf?index=trueIn PDF document text
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_35eafec7da184aa18c6dc3c8fad4e9b3.pdf?index=trueIn PDF document text
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_ae602b88dc844d239e08b09a02f9a7c0.pdf?index=trueIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_58d428045d0a49b6bf11645cc27bf3b8.pdf?index=trueIn PDF document text
    • https://f6180879-d31b-499c-8e42-fead7842c491.filesusr.com/ugd/007227_0256405734304753b2747fae12c55b3f.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF5 5172 bytes
SHA-256: ab0d8b6f4166e32ee0297016050a8ff9384390bb78197343df29f7b24e535195
font_01_sfnt_off0000fe91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE91 10248 bytes
SHA-256: 63690dbfedc568f2247fdb9d96d113630bec05fd11364ee31220eac259607d8e

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