Malicious PDF — malware analysis report

Static analysis result for SHA-256 8261002de54eb079…

MALICIOUS

PDF

126.6 KB Created: 2021-05-28 16:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8a26ddeceaee4c2282a15e9a77084394 SHA-1: f34724fa367b3b4987b967a3483493e9f83ca6f3 SHA-256: 8261002de54eb07951de3629ae33d2430dceb273b096c144e052e38bbd8180aa
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are to SEO-related content, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URL points to a domain associated with potentially malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://dafemum.ru/strik?utm_term=fifa+20+mod+pes+2020+edition+android+offline PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383678/normal_6037c84991b68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379477/normal_6054e88d8fccb.pdfIn PDF document text
    • https://mudepazenanaj.weebly.com/uploads/1/3/4/7/134765609/gumivuka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378153/normal_60625fa3e2bb5.pdfIn PDF document text
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/gubokari_duzifuxumixapaf_lamoximalobema.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470402/normal_6018c14cea6c8.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/68004c42-7181-4d85-a16c-5caa90626ca5/what_to_do_if_your_xbox_controller_button_is_stuck.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/891914b4-70ac-4414-b21a-1f6a6cc18e0e/how_to_describe_a_alien.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c1f3da3-2b2e-433a-982d-46b8a3fbbed1/44450613081.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54d2a4a6-df58-4bed-b077-efe79cbfd6f7/is_flight_simulator_2020_out_yet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/471882ad-d3b9-4d48-a921-b59fbd3dad1c/school_admission_form_in_excel_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e3c7083-c919-4b12-97b8-09ac7837092c/docker_cookbook_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57436370-09fc-4f94-86ea-6a6b802c5feb/73558026725.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c61d5644-c914-4485-8d1f-5d57884a4bd3/plantronics_voyager_legend_cs_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8583d382-a4c9-4d16-8e01-e6b3f97b7bf7/jiwenej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d88c968a-4704-4307-8947-204eb287ca1d/nosesodelubelegujap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b494fb19-8ad1-43a6-af07-9bb46241e6fa/history_alive_7_student_workbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65c03cbb-b85a-4bdc-b52f-c63c55abcd40/73042437349.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FD6 3196 bytes
SHA-256: 1a1cded32c5c5ef3cc597d5b05daffe1cd2c129adfcd74e84a7b5df655914589
font_01_sfnt_off0001ab43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB43 5416 bytes
SHA-256: 30377f8bad0c97b87dc6f3e5968f344ef002fcb302bac0b7a2be6b58e203ff95
font_02_sfnt_off0001bd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD9C 14748 bytes
SHA-256: 44c7f9c0be2389f11bd1fa946f0aa016357527ac0e1499ef2373c3d94efdd62c

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