Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4cc929cd78c595f…

MALICIOUS

PDF

78.6 KB Created: 2021-03-30 09:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 358105a475bbf52bf0807677d2da9e15 SHA-1: 73e7cfeb5484e5a75b064cf8e57b29d914afd677 SHA-256: f4cc929cd78c595fd3376f312bcde8586ac237914796bd49422de84c90c1b039
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. It contains numerous external links, with one prominent URL pointing to 'ponafet.ru', suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate malicious intent to redirect users to potentially harmful content.

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://ponafet.ru/wix?keyword=ouroboros+game+guide
    • https://xososikanezav.weebly.com/uploads/1/3/4/8/134892973/bisotumopevamaxo.pdf
    • https://static.s123-cdn-static.com/uploads/4477921/normal_6007bb17ebd5b.pdf
    • https://guduzuzej.weebly.com/uploads/1/3/1/6/131606672/juged.pdf
    • https://cdn-cms.f-static.net/uploads/4446038/normal_5fd9fb447c821.pdf
    • https://cdn-cms.f-static.net/uploads/4472768/normal_6054140a36294.pdf
    • https://static.s123-cdn-static.com/uploads/4417208/normal_5fcc5ebdd2c60.pdf
    • https://xepudala.weebly.com/uploads/1/3/4/7/134737014/basefazarew-suxujabuge-kuzefakas-tipibusibesibed.pdf
    • https://banadibujanozut.weebly.com/uploads/1/3/4/9/134904666/1782025.pdf
    • https://gasimela.weebly.com/uploads/1/3/1/3/131398285/denipirena.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/60cb196f-b31e-438a-822c-9bacc502458f/30582628680.pdf
    • https://s3.amazonaws.com/kitakilesa/jim_stoppani_shortcut_to_size.pdf
    • https://uploads.strikinglycdn.com/files/9992b12b-93bc-4558-8c1f-238f9e9bae38/viking_appliance_repair_memphis_tn.pdf
    • https://s3.amazonaws.com/paxivogedewilu/electrical_artisan_interview_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/f5e7a486-9611-47d9-b618-5eca91190f4c/76353496126.pdf
    • https://s3.amazonaws.com/vovabagubajegeb/65352490799.pdf
    • https://uploads.strikinglycdn.com/files/790141fe-8f0d-4d89-b0f7-1da031b4f3d5/51073761475.pdf
    • https://uploads.strikinglycdn.com/files/401eab5e-42ad-4954-ae1f-0047e35f0af6/62090143871.pdf
    • https://uploads.strikinglycdn.com/files/efc8d8c5-9ea5-41a6-aa17-2396ee075612/left_side_of_the_brain_functions_stroke.pdf
    • https://uploads.strikinglycdn.com/files/0a524f49-d48a-406a-9748-4941670e9423/shapes_worksheets_4th_grade.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_off0000f717.bin
29241a84f7b3ece79cc40e7fd58f2601bb5b68fc28bc3c84dfc2e175d05013ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF717 5280 bytes
font_01_sfnt_off000108e5.bin
1c13effa2947cdc96a2011a56fa05bc6d55b2a45786ea67a270c4ea7e1c8a6bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108E5 10672 bytes

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