Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4df7a65845a152…

MALICIOUS

PDF

78.2 KB Created: 2021-03-14 12:42:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ad3cdd660591421bf1e351d6fa195442 SHA-1: 1d52574099910e12079872a4d66510832fc80341 SHA-256: 4a4df7a65845a152a42c65097b28144dbf53c218979c21bc4ab8a885c6b3f594
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 links to external websites, with one prominent URL being https://xajibur.ru/award?keyword=wharton+casebook+2020+pdf, suggesting a phishing or scam attempt. 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-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://xajibur.ru/award?keyword=wharton+casebook+2020+pdf PDF link annotation
    • https://cdn.sqhk.co/mubutuve/vmibNbp/kafume.pdfIn PDF document text
    • https://cdn.sqhk.co/gisusisabez/cgjnQgi/lukojolanulutufisufiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464700/normal_6047c1e109736.pdfIn PDF document text
    • http://nakozek.mypressonline.com/vopuwumofimovovero.pdfIn PDF document text
    • http://zozavelomidabi.scienceontheweb.net/maluxuvaxuvatunijere.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449603/normal_5fd23aa9f2d7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475715/normal_6048157d2a11c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424951/normal_5fe880be4b1e7.pdfIn PDF document text
    • http://faladen.22web.org/the_lowest_animal_satire.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/jeworurowam/fujeburoromapepib.pdfIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_f38102856a104a37bcd3f0172244a756.pdf?index=trueIn PDF document text
    • http://nubimopupugu.rf.gd/fusion_bd_bangla_natok.pdfIn PDF document text
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_ef0082a9429c495b85b4ae508ecebd2a.pdf?index=trueIn PDF document text
    • http://vilumepidiwego.myartsonline.com/do_you_believe_in_magic_in_a_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/be_informed_you.pdfIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_d4eecf3df1c7473fb309317157858235.pdf?index=trueIn PDF document text
    • http://suvaduwopo.epizy.com/telugu_bhajanalu_songs.pdfIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_595c3b4ee3c644c5aa7d6089adcabfc3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tapelu/vimexoredosanovipev.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/pemotimumogizute.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE743 3396 bytes
SHA-256: dc4d71ce285fdcd5cc190f2ac55ebe161f09300daf516bb9704fb6cb06182250
font_01_sfnt_off0000f369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF369 5704 bytes
SHA-256: 0baecef151dd820571ff2f5312458953235dc8ba100b9274612a0efd657b09d2
font_02_sfnt_off000106db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DB 10748 bytes
SHA-256: b93ac314e87d26d1331acc442586a350ff158e5f931778d557e6913e7814ed48

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