Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dfd952711b813d7…

MALICIOUS

PDF

72.5 KB Created: 2021-03-15 15:41:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c18d7f13c1b5116a394bebaed5d34703 SHA-1: de98e4cdeb9d489e47beb4d0545c1abab241146b SHA-256: 0dfd952711b813d73066db18a3b60e0fae4859dcb6b41eeb0b73bcc76a7b001a
156 Risk Score

Malware Insights

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

The PDF file is identified as malicious by multiple heuristics, including ClamAV and an ML classifier, and contains a significant number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate an attempt to direct users to external, potentially malicious, content. While no scripts were explicitly extracted, the nature of the PDF and its numerous links strongly suggest a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/award?keyword=knee+pain+relief+exercises+pdf
    • http://torchqbfl.fun/what_degree_to_be_an_it_managerw06tu.pdf
    • https://cdn-cms.f-static.net/uploads/4476577/normal_6044d145e9548.pdf
    • http://dokumenty-kiev.online/81838677396eayjx.pdf
    • https://cdn-cms.f-static.net/uploads/4394068/normal_603afedac2f26.pdf
    • https://static.s123-cdn-static.com/uploads/4420434/normal_6000446317028.pdf
    • https://static.s123-cdn-static.com/uploads/4370066/normal_600615db43de0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_9423d69a3332448399757c3e5131c669.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d8973f68-f7a7-4808-b899-5bf40b4fb848/6327045821.pdf
    • https://uploads.strikinglycdn.com/files/b5f6fe5a-69ac-4623-b216-6aa07528437f/motekuvefoxokasuvori.pdf
    • https://uploads.strikinglycdn.com/files/6aa6f49f-3705-4183-b0d2-2871edff5dea/nivaf.pdf
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_917b2254fff740fd9a7d9b55b76a721b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b61ee1bf-5688-4040-8afa-80766bc46db0/megutuker.pdf
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_67ec23a3f25b40a4b2ea654198733439.pdf?index=true
    • https://uploads.strikinglycdn.com/files/68d33ec2-66d2-44c8-8fb8-a808b8cde987/state_and_colour_of_halogens_at_room_temperature.pdf
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_80b810dd38f5485da8194c6673199c1c.pdf?index=true
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_0e3c20a6feaf4d17a1c9dedec7bb022b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/349b93b2-16e7-4ede-a8e0-f251860d0002/syma_s5h_helicopter_instructions.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de95.bin
49c5aaaef68054c71220e5419e266a27bd7c00adf8cdf1fff837c8009b4328e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE95 5184 bytes
font_01_sfnt_off0000f053.bin
0b5494bfc62e636f4ec12b70f60661f9c39f1504b6031d92538293047ad48085		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF053 10708 bytes

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