Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff9966b3328ae6f…

MALICIOUS

PDF

83.9 KB Created: 2021-03-25 10:10:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b280bcf5c158b7541f7d8aeccf0492de SHA-1: 21849a9df70d9e233053ff93d18d27e2c682f53a SHA-256: 8ff9966b3328ae6fa4655a8c2577ca1ae78b6fa1230161992cfefc0441e0d358
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and link farms, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the presence of external URIs and the PDF's structure suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/award?keyword=general+aptitude+questions+pdf PDF link annotation
    • http://nilozususa.iblogger.org/tujefagixag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454180/normal_5fe7953c15f5b.pdfIn PDF document text
    • http://pokavitapizinuv.iblogger.org/web_application_performance_and_scalability_testing.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481665/normal_5ff396ca5ada5.pdfIn PDF document text
    • http://gonugotez.22web.org/nalexepugobutigifo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403128/normal_60240cdc9d7c1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_a494fac9578642c49edcd785a4dad181.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c9603db-2174-4e2a-8e19-d9addf2c59a9/are_mugs_microwave_safe.pdfIn PDF document text
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_7791ddc2bcb2406ebab61410fc8c02cf.pdf?index=trueIn PDF document text
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_79fe105610de4c01a7839e0888597579.pdf?index=trueIn PDF document text
    • http://mazogatu.epizy.com/13545811025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f19d365-b8d3-4981-92ee-325a4ac1656f/senisisinikagumidakodide.pdfIn PDF document text
    • http://timojodabemisux.myartsonline.com/67110266238.pdfIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_2330c3a0aa2a48a5a6f529d4cb8e890d.pdf?index=trueIn PDF document text
    • https://a7ed8af5-5e4a-4eaf-98d7-51655494ca15.filesusr.com/ugd/b5c45a_17de4b5fee354f4981425bc92f434059.pdf?index=trueIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_a46d8f7969074de081cc2aafd0fb7196.pdf?index=trueIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_735ff1eff349463b94126b8cfef17c9e.pdf?index=trueIn PDF document text
    • http://tikolikenugim.epizy.com/41629085437.pdfIn PDF document text
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_2dd2e9c6d0ae4d74a71e3fbc808f98db.pdf?index=trueIn PDF document text
    • http://letutemoxeluz.onlinewebshop.net/wumudekisapukurejalusora.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18B 5192 bytes
SHA-256: 23de2389a81a3a32be89f15ac98410b76b8bdb2185a6b1a14598e2d7b4379ce8
font_01_sfnt_off00010343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10343 12012 bytes
SHA-256: 487fb62c54f734791593832aacb71fdbce5ee290bd3964a886cbc208fcecf7c8
font_02_sfnt_off00012c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7A 16280 bytes
SHA-256: 33b69f6856a8731c1544293dbd4f4fd9c262c8581ad63976b3de394f68d21562