Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5ca827c5b86efc…

MALICIOUS

PDF

61.1 KB Created: 2020-12-19 05:05:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4ea260bacd7e5cf217b74f72788b0f1d SHA-1: 5d73092cd59fa7dbafb5a638ed1e439f61964ad5 SHA-256: ba5ca827c5b86efc699a51e4512155879aaf0c42071db6680efd1b5d1f18e868
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URI that points to a suspicious domain, trafffe.ru. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The presence of an external URI suggests an attempt to redirect the user to a malicious site, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffe.ru/strik?utm_term=chair+leg+floor+protectors+rectangle PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463807/normal_5fa8b1ea90542.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418566/normal_5f9b3cee6e1dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408875/normal_5fa051937bbb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383137/normal_5fb7f2e33dce4.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/tenunud/tavumopewadejorimazuno.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc56133a3bf4b14abc7046c/t/5fcbe94b33fb14715cc9747e/1607199052673/divano_2_posti_patchwork.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93e3441a-0bb5-4ae0-b129-9786b793e1c9/juzosu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc28126d49dd124473e558a/t/5fcc5638d336b863f0b83948/1607226936361/fetatozulegifo.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/tempur_pedic_adjustable_mattress_sheets.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc53140085bf90c0e192ce8/t/5fcd05dc978da30c5600d8a2/1607271901026/green_forest_ar_cattle_prices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b13c27ef-4909-4d90-b0c7-4fda99a1e0f3/siwadovilidunedifofinawil.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd26b15b546e47908791f0/1606231731388/70082098352.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc77d2aeddbb05c6895727f/t/5fc8ea22fc44f34df66aeb0b/1607002659229/miami_dade_public_schools_covid_19_dashboard.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc582dfc30a162e0c71c6b6/t/5fce22731e1a4d7de153436d/1607344755050/hole_io_unblocked_cool_math_games.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_off0000b375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB375 5184 bytes
SHA-256: 02b71c93380e20d76f2f1cbb9e5ceaf49896ba8a124ba0c908488437e515ce86
font_01_sfnt_off0000c514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC514 10080 bytes
SHA-256: 312d4f1d94708e64fe22b0747f3db974797dc041d159b1139f915a08c2e88012

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