Malicious PDF — malware analysis report

Static analysis result for SHA-256 9621d3784f71f855…

MALICIOUS

PDF

85.4 KB Created: 2021-05-22 06:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2419feec2a82ee8beee6a16a724e72f8 SHA-1: 498b1627e130a6e209a7d41bab1aad4cbbd8d38c SHA-256: 9621d3784f71f855acf7f88aa619bedd4715975668f43cf15577619d6bc92294
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/strik?utm_term=hazard+analysis+and+critical+control+points+def PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373997/normal_603fe325204ae.pdfIn PDF document text
    • https://damepigafu.weebly.com/uploads/1/3/4/7/134725174/xunevaxofegupur.pdfIn PDF document text
    • https://ranepudanaliv.weebly.com/uploads/1/3/4/0/134000181/5463569.pdfIn PDF document text
    • https://sojuseruk.weebly.com/uploads/1/3/4/3/134367588/kubilimifegexeb.pdfIn PDF document text
    • https://pebepatesova.weebly.com/uploads/1/3/4/4/134447190/f2ed759bc4eceed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373519/normal_604ca5811844c.pdfIn PDF document text
    • https://buwofapakudo.weebly.com/uploads/1/3/5/3/135316190/2077868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385217/normal_601bbc3b94020.pdfIn PDF document text
    • https://didilajuti.weebly.com/uploads/1/3/4/5/134585724/c988b80ac3f215f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402261/normal_5fe1699fc05f8.pdfIn PDF document text
    • https://serataxufo.weebly.com/uploads/1/3/1/6/131606193/4701137.pdfIn PDF document text
    • https://febelozo.weebly.com/uploads/1/3/4/5/134599394/37b1caf66ed2152.pdfIn PDF document text
    • https://biwawidojimu.weebly.com/uploads/1/3/4/6/134648839/950230.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393776/normal_6040063aefba2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485149/normal_6029e8fecb408.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388177/normal_5fcb9df70a3d2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f6cc457-8ab5-45bb-81cd-36c2cf16a702/how_difficult_is_it_to_study_law_in_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e05cf36c-a901-4656-a295-6c74fdd724cc/gmat_sentence_correction_tips.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cdaf018-cd83-444a-bd3d-4e7eef3c829d/denon_avr-1912_hdmi_7.1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/233cfbd9-6ebc-4a2c-9e01-aa82100e3217/100_verbos_mas_utilizados_en_ingles_y_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb7a885e-334e-4b03-ac0a-f291c1890f95/yaesu_ft-897d_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/303cf73a-6703-46d3-9cb5-d29921854d0e/71378179721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2744e194-cc05-42a6-8ddf-99541174ee99/xowetil.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E75 5264 bytes
SHA-256: f50530637235ca23a28c56c1a23360fdd181a2ced40a2e01eb578488fb9b3184
font_01_sfnt_off0001207d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207D 11548 bytes
SHA-256: 40906dd5943fe3ba7d2979ac4b15dd0e01c6c3494ee595134acee7ed9141b97b