Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4cdaaeb9b074bb…

MALICIOUS

PDF

75.0 KB Created: 2021-01-06 23:11:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 71e47c644071fcafaa6496d1882aaa57 SHA-1: 95fdcb0aefbda1f1c0637025c34261f5a9a9a8aa SHA-256: dc4cdaaeb9b074bbd19a991826603701f553eb1a9fd480e2031b5e64881597d0
222 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to external websites, including a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong attempt to direct users to malicious infrastructure. The ML classifier and ClamAV detection further support the malicious nature of this file, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://traffmen.ru/123?utm_term=short+curly+bob+wigs In PDF document text
    • https://cdn.sqhk.co/getabemuto/Ehc4jip/cinema_box_app_not_working.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448985/normal_5fa90b568279b.pdfIn PDF document text
    • https://tedinuvade.weebly.com/uploads/1/3/4/3/134348171/4748346.pdfIn PDF document text
    • https://vakuvovigoder.weebly.com/uploads/1/3/4/4/134467198/gaxamifegedexasox.pdfIn PDF document text
    • https://cdn.sqhk.co/nedupugifuka/gD3gdjh/55955700620.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/fatisake/umass_boston_ladc_courses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aa3cd5c-8bd5-4413-824a-13aba3a10033/revemurikukarixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5126d4b6-027f-4b52-a21b-a0fb0c2330a4/message_this_iphone_is_disabled.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/502baf42-1ce8-4fb0-bd96-7629a030a3f6/12040005215.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/dinesh_chemistry_class_12_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dca4505c-b64d-4f32-bbd0-79b35d217ef6/convert_jpg_to_pes_embroidery_file.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e7f2868-8e19-4a9a-a81a-2a44a813d349/60648048461.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/solving_quadratic_equation_by_quadratic_formula_worksheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D6 5288 bytes
SHA-256: 30293c128d702a40c5e4c6c984d8bc32460ecf25fd13d8eb70af954100fcda06
font_01_sfnt_off0000e4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4ED 10668 bytes
SHA-256: 55c7808564cd4119f4cc72394ca391ad769d89463bed64359e38fa884a6fa73d
font_02_sfnt_off00010978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10978 16168 bytes
SHA-256: e5458d7b6d82539349b17fc4713a17e1381d471255c72d9f8116b7c86e08c443

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