Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f52cf37460bd2e4…

MALICIOUS

PDF

89.1 KB Created: 2021-03-16 07:05:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2f5b06bb79c009173fc1b72a0368c0e0 SHA-1: 222b5aa9424f331aaaefe175a13fca3c2f70297b SHA-256: 4f52cf37460bd2e4052e10093bbe694044425942be573da0e9f205db6d7036cd
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that masquerades as a search result for academic articles, likely to trick the user into clicking it. ClamAV and an ML classifier flagged this file as malicious, indicating a phishing or trojan payload delivery attempt. No scripts were extracted, but the presence of an external URI points to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/award?keyword=depression+journal+articles+pdf PDF link annotation
    • http://idealicaitalia-official.site/4fun_app_downloadyz43g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465142/normal_5fe54c18cfd0a.pdfIn PDF document text
    • https://cdn.sqhk.co/xanovixewin/Chghdib/machine_gun_kelly_age_megan_fox.pdfIn PDF document text
    • http://kushtanash.ru/bhaktamar_stotra_lyrics_in_englishqgbzp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390057/normal_600235d8392f2.pdfIn PDF document text
    • http://xekedibu.iblogger.org/vedekakaputuvuronited.pdfIn PDF document text
    • https://cdn.sqhk.co/xotosira/fxheEid/super_smash_soccer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490269/normal_600eca87680d2.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
    • https://s3.amazonaws.com/julexekubaj/mejajisu.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/supurujudogojojutuko.pdfIn PDF document text
    • http://tisizewim.epizy.com/google_photo_search_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/ebook_bootstrap_4.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/worksheet_1_law_of_sines_ambiguous_case.pdfIn PDF document text
    • http://jazajebexixe.epizy.com/nupatasodamabupowij.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/pasudaxapepupojoditim.pdfIn PDF document text
    • http://xetibewiz.rf.gd/gitixo.pdfIn PDF document text
    • http://ruredat.rf.gd/19019896018.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/braum_s_nutritional_information_hamburger.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/new_flight_simulator_2019_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/97104090866.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/23504554845.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_off00010f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8B 5108 bytes
SHA-256: 2ac71a778b4d7336751c9eb0fc59adbe6389de4a45990c7218758d5474a1f3e2
font_01_sfnt_off000120f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F8 12552 bytes
SHA-256: cc89da3c74eb64a71f6789f32d0643578afa82f12f6deed8ac0b92f869c2b110
font_02_sfnt_off00014906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14906 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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