Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfcd5e9958194579…

MALICIOUS

PDF

70.4 KB Created: 2020-12-03 05:41:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6b8af66698a7b688350deb9d6b9743d5 SHA-1: d349a32b33c675abc9ceda66ce8a36120d5a6394 SHA-256: bfcd5e99581945799699c3b51fb9a0e05ff65b9e88dccba19f16a0ff16f54c27
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of a 'Browser extension / update installation lure' heuristic strongly suggests a social engineering tactic to trick the user into performing an action that leads to compromise. The embedded URLs, such as 'https://traffset.ru/123?utm_term=adobe+acrobat+9+pro+serial+number+free', likely serve as part of this lure or as a download source for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffset.ru/123?utm_term=adobe+acrobat+9+pro+serial+number+free PDF link annotation
    • https://ragitodis.weebly.com/uploads/1/3/4/7/134753297/lodewafawamelake.pdfIn PDF document text
    • https://zozilevijuni.weebly.com/uploads/1/3/1/3/131383476/6228911.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1548511f-b384-468a-aa64-bc7509b96cd1/tablas_de_integrales_y_derivadas.pdfIn PDF document text
    • https://s3.amazonaws.com/potevip/properties_of_equality_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/kizuporowefib/70730284974.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d75ae81-a71a-43ab-8243-c51564fc2340/magigadofixemujino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b2b7c0c-e295-4378-ae93-c4dca76bc57b/juxowemu.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/anaximandro_arje.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/jefawepusil.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/dalirujunegoxojirulov.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd01cbec0a1d2b4e567195/1606222283838/tumegopil.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/82675905642.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5d0859698b02c7f425fc5/t/5fc6129b3c02f22b9ddc7908/1606816412405/pagan_prayers.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/35298523995.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/deepmind_12d_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/contamination_of_water.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/336c67a6-fd87-4975-9568-513b38b52071/how_do_cells_work_together_5th_grade.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_off0000d657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD657 5584 bytes
SHA-256: 6cce12b203b1acb65251df649df118ea5d35658964b50587e5116e9e25807868
font_01_sfnt_off0000e93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93B 10344 bytes
SHA-256: 69eef75ca67322d257fe2b9f2e36b3f3d48a00cc429d77fe11683ad4470e9097

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