Malicious PDF — malware analysis report

Static analysis result for SHA-256 558cf7a3dc0c0748…

MALICIOUS

PDF

76.2 KB Created: 2021-04-03 05:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 71c4d3c3bebf013eb2173052ed6ca392 SHA-1: f3a3e9c89fd3bb6bc3c56c4302fbb227c77ac378 SHA-256: 558cf7a3dc0c0748c38557e7fc895813660da98a4b7196bf4ef53ccfe1f17e00
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious URL, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF with high confidence. The document body is heavily obfuscated, but the presence of the external URI suggests an attempt to redirect the user to a malicious site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/wix?keyword=what%2527s+my+angle+tool PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403819/normal_6049531fa64e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409806/normal_605a5f71adf08.pdfIn PDF document text
    • https://cdn.sqhk.co/fekawifen/gdqggic/joniladupanakuduf.pdfIn PDF document text
    • https://cdn.sqhk.co/mugegiduveb/cYgdwLq/mexevi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412902/normal_6040f6ef7eee4.pdfIn PDF document text
    • https://cdn.sqhk.co/savekedeg/hhihUjM/folding_brochure_stand_3d_model_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470029/normal_6004b7e15f665.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420608/normal_603387f3ee83f.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/jwygjgi/fetirijatowarezekerikozew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387054/normal_601e6c5553ba6.pdfIn PDF document text
    • https://cdn.sqhk.co/firijanab/e4rhd9o/paper._io_3_game.pdfIn PDF document text
    • https://cdn.sqhk.co/temududote/fifjaie/79017559431.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384820/normal_6036c8b2e7a98.pdfIn PDF document text
    • https://cdn.sqhk.co/rebosuvut/kE21gft/samiwu.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuputid/7J6iepA/tugafagepodogu.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/jidR3gd/42759303384.pdfIn PDF document text
    • https://cdn.sqhk.co/xovinexesun/jehciic/real_cricket_champions_league_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/bemaxopig/lhgjfHg/gatojulijawowanumujog.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/nazekisigiduz/55880756470.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/er_physician_assistant_jobs_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/agario_2._6._3.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/implosion_1._0._6_mega_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/52204114522.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_off0000edfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFB 5152 bytes
SHA-256: 28480ad7538fd4d643c832049aed14c91577c10cfc0e4efa64a04a1f3db75844
font_01_sfnt_off0000ff7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7C 10620 bytes
SHA-256: cb5873fcbe84113296c0936b830fa475e2d20810d8f2b3ce660432d24b960dd3

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