Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe16d926b5d38eca…

MALICIOUS

PDF

75.9 KB Created: 2021-03-09 11:17:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e72f498a1bba6c3773da7c1060ae93dd SHA-1: e8458907a19e541d1893bbdc7c80e144b9004c88 SHA-256: fe16d926b5d38ecab0085405f4215caacc37441316886156bdaa5dd971f142b3
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jumiwimov.ru/award?keyword=appositive+phrase+worksheet+with+answers+pdf PDF link annotation
    • https://lelobetiladafan.weebly.com/uploads/1/3/4/4/134497055/09717.pdfIn PDF document text
    • https://bosamekuxukis.weebly.com/uploads/1/3/4/6/134672370/fdadab07c333f62.pdfIn PDF document text
    • http://it50life.pro/63673194500wqhfk.pdfIn PDF document text
    • https://vekafikag.weebly.com/uploads/1/3/5/9/135986004/napazu.pdfIn PDF document text
    • http://phtech.site/sorcerer_class_5eig7c2.pdfIn PDF document text
    • https://bivapere.weebly.com/uploads/1/3/4/6/134689139/60126a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_4e52059b2661453cb870c5aff131e6d2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/292a59f9-cb0c-4f4d-af75-dd60a2472060/fedezaxulalisifedisap.pdfIn PDF document text
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_cce1a8da174843c79cb041c85050f06f.pdf?index=trueIn PDF document text
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_0c33734b20a24af69a6b045d7c0572c1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fcad4ad-84df-42d4-9650-3a567a2e109f/is_deep_learning_better_than_machine_learning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25a20499-db2b-4c49-b778-44d0b5478408/1830491125.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6db7926c-c1e3-4d6a-9de4-8de0706e1c6c/ruwalopomiforudebud.pdfIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_ec1e028e55b6452e98bb0b854f4c0223.pdf?index=trueIn PDF document text
    • https://246406bc-bb0d-4f29-baed-d8a6153a9543.filesusr.com/ugd/3ddeef_f2fe79fdfb0e41eabe6a44b145582427.pdf?index=trueIn PDF document text
    • https://63aa7d51-6c54-48cc-ac87-b710a0da19c3.filesusr.com/ugd/c8d394_4aa9356d42e2463882c2aa6b849329be.pdf?index=trueIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_818578cb007f4015a985c991d41b400b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/389c7e00-43ec-4881-bac2-4a29e7aad9b0/runijavanefixegekigur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01e946fb-f5f7-430a-bdaf-0a4c17c7a6f4/ielts_academic_writing_practice_task_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfd0254a-6e8c-4717-966d-68fee2556c45/kenmore_600_series_gas_dryer_not_getting_hot.pdfIn PDF document text
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_c06714bec8f04154a4f453c64421b076.pdf?index=trueIn 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_off0000dfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEA 5092 bytes
SHA-256: 6c415061088de993e3cbf36004abe15f84d68c561a0efde90cae61efe5adcbfc
font_01_sfnt_off0000f13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13E 10144 bytes
SHA-256: 6169ec1ab646ef7b7f877a7c330809a0b51b0821d12667c0b718e6c8c3221464
font_02_sfnt_off00011402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11402 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

Open this report in the interactive analyzer, or submit your own file for analysis.