Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f49f0d8de10afd…

MALICIOUS

PDF

316.1 KB Created: 2021-05-06 22:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3d68f770695ff6a6f4c83539d74aeade SHA-1: c8e9b62fadf1c303714ae4950288c3b709140db8 SHA-256: 83f49f0d8de10afdb67ac961f4c18a04e9ecd6e1bc15ffa42604b8f785c5e12f
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds external URLs that direct users to attacker-controlled resources. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9522

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://soxebez.ru/strik?utm_term=the+adventures+of+tom+sawyer+chapter+1+questions+and+answers PDF link annotation
    • http://lyudi23.ru/present_tense_of_ser_worksheetppu9i.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefawoz/i7qZicN/chartreuse_yellow_color_hex.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/gejbSgd/vizalolamiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476578/normal_5fd88247601ae.pdfIn PDF document text
    • http://shoop-fo.ru/resumen_de_la_siesta_del_martes_yahoomqs66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417528/normal_5fd96916cb57f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374535/normal_606825c15551e.pdfIn PDF document text
    • http://hardcreditcheck.info/16171242930zo887.pdfIn PDF document text
    • http://usesol.xyz/toni_morrison_paradise_sparknotes9ytur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484154/normal_6022da3aac8bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416143/normal_5ffe8cc921521.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426263/normal_600087c52f658.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453338/normal_5fda93da87bef.pdfIn PDF document text
    • https://cdn.sqhk.co/mojaribi/GNgdit4/84079729426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480389/normal_6066ea22ef150.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388178/normal_5ffa83edafc24.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/padanivozeb/interval_notation_graph_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/fuwegu.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/khan_academy_answers_7th_grade_math.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/3985408218.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c31c971-f00f-41b9-aef1-3d5c44736ac5/a_discovery_of_witches_shadow_of_night_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/810c7b98-9cee-4e74-8558-0239fd1b22e3/81632822511.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000484cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x484CB 5624 bytes
SHA-256: 3ee46bcb51959affd0d225b009a87ebe5a22310ad4fbc5663d724affe0f86149
font_01_sfnt_off000497dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x497DC 10608 bytes
SHA-256: aa697638281aa1e1fe63d31c7dd30e92fd1ec7780f5d3e2649ea382edc5d073e
font_02_sfnt_off0004bc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BC32 16364 bytes
SHA-256: 1c8bc4bf779fdf5fdd428ab6ddc6a1665d3fdc1c26b4364692bd94c1ed605b78
font_03_sfnt_off0004d206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D206 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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