Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09b2d6284641472…

MALICIOUS

PDF

90.7 KB Created: 2021-04-04 22:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bd277eced56f1d3cb52e6dca6e1464a1 SHA-1: 28c4cc17618bfb69ac7fb9fd63ae06ef8f1586dc SHA-256: b09b2d62846414729d3a9bdb0816298353d6abfbbbcf24fa80c0fbb88e1c58da
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to search terms, reinforcing the lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://druttle.ru/award?keyword=carmina+burana+piano+score+pdf PDF link annotation
    • http://ravigimojamel.mypressonline.com/sigugaruzusabevowisaxaju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424647/normal_60114634b5255.pdfIn PDF document text
    • http://1ux.site/mekubipasuvivubufaebs4t.pdfIn PDF document text
    • http://lazisirogabidir.mypressonline.com/gixurovawe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366395/normal_5fffb1ffa2b1d.pdfIn PDF document text
    • http://navalny.design/40080205396zr9nu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462362/normal_5fca6b3f7f73c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451220/normal_60446c300253c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496605/normal_5fc748091fe64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383577/normal_5fe5324ac9b0f.pdfIn PDF document text
    • http://durebemidiges.getenjoyment.net/vizomoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379045/normal_5fcd89eed6b6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402956/normal_6062e9fc87ec7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480584/normal_60102cf548bc1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_3ec020a505a245eda84d1c1d8660bec0.pdf?index=trueIn PDF document text
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_2674ed8174b64d689103175d037e7353.pdf?index=trueIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_5bcc43ee90434a459de60ed894e37977.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b75f388-5c7c-4b19-8345-865ca307acfb/bose_replacement_ear_pads_qc15_amazon.pdfIn PDF document text
    • http://xijejuvi.myartsonline.com/10988164523.pdfIn PDF document text
    • http://fajenadiwizowo.atwebpages.com/sewanofatimun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e7a5f3e-bff3-490a-8be5-5e728b42c0b1/wureru.pdfIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_0c7a236c30dd44a3ac0746a16ba28349.pdf?index=trueIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_9e2c9736c61b4e07b38856e1633f23bf.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
    • 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_off00010d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D53 5316 bytes
SHA-256: 762cf9090c7108ac356d66cab43601a9af3aecb3c246a1e5dd6830af5177c1dc
font_01_sfnt_off00011f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F45 12788 bytes
SHA-256: edca772ce1efc4c857220f0f0830f24981a8af3a632be78dda5be91ba08c6fc8
font_02_sfnt_off000148da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148DA 16120 bytes
SHA-256: 15a68420f1c377824b8c1fd571ac7c30556db1b4bc05006bf44ec3f6c6c83208