Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d7ce0a809383fa5…

MALICIOUS

PDF

84.1 KB Created: 2021-03-20 12:08:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0dacfe2690f7b6e100b377f271ff0c2 SHA-1: 92b00545037fa78cc34fa68051bb8dfdd40e957d SHA-256: 1d7ce0a809383fa5e381e507df7a068939240db95195a9cddebd7437b22d071e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is designed to host a large number of external links, potentially for SEO manipulation or to distribute further malicious content. The presence of an embedded URL pointing to 'ponafet.ru' further supports the idea of external resource interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/award?keyword=sql+query+interview+questions+pdf
    • https://static.s123-cdn-static.com/uploads/4373259/normal_5ffdd4aa8c549.pdf
    • https://static.s123-cdn-static.com/uploads/4477623/normal_6001bf2d644f7.pdf
    • https://cdn-cms.f-static.net/uploads/4370057/normal_605376aba573d.pdf
    • https://cdn-cms.f-static.net/uploads/4477658/normal_604baaf984501.pdf
    • http://kobivoweder.mypressonline.com/midoveguga.pdf
    • https://static.s123-cdn-static.com/uploads/4463809/normal_5ff1b9bf27bb0.pdf
    • http://jajitefufig.iblogger.org/expressions_and_equations_answer_key_7th_grade.pdf
    • https://cdn-cms.f-static.net/uploads/4459060/normal_6050b46ab4953.pdf
    • https://cdn-cms.f-static.net/uploads/4496582/normal_5fd94b876ff2f.pdf
    • https://cdn-cms.f-static.net/uploads/4476272/normal_604d1ca1db95f.pdf
    • http://gajozemexip.22web.org/65206105377.pdf
    • http://lozejebivo.scienceontheweb.net/best_linux_distro_for_laptops_2020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_b0559120560341dc8110ed76e8073877.pdf?index=true
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_37e6dd75ec6f4646a33674c4b1e68014.pdf?index=true
    • http://kibomopog.rf.gd/4483113863.pdf
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_ba53d0019ab94a9a81e769cef84e2b37.pdf?index=true
    • https://fb075467-9d00-46c6-93ac-2b777f5e584b.filesusr.com/ugd/8bcd66_507d9dd0c8b9482aa898e3bea1acbe7e.pdf?index=true
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_6d9e00f24f644eb7aae14a88702d20c8.pdf?index=true
    • https://eeeff038-21f9-42a6-bde0-cd945221d618.filesusr.com/ugd/9dc459_a519030bb1dd4a22ad1c28f4870f472b.pdf?index=true
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_b7798a2ffdf04761a6ea45f3ce5bf924.pdf?index=true
    • http://femodizabofowu.epizy.com/jozalafag.pdf
    • http://lodonevubepivor.epizy.com/internet_explorer_11._0._96.pdf
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_c52cf1a1138847a880fe4b0ec7b18733.pdf?index=true
    • 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_off00010729.bin
8f421111ed6481c80880c6faa0b0bdc00e61d2b91ca7dfbc271fc8e302d75c78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10729 5308 bytes
font_01_sfnt_off00011964.bin
1e4f2ff1de27a36e9fe0c5f7296ad8c8b755aac67f171fe4dcfae4c12821687f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11964 12692 bytes

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