Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb277d3e1a6b2c7…

MALICIOUS

PDF

77.4 KB Created: 2021-05-22 01:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3798c1e29e48dfe0b591e26e7e60f89d SHA-1: 961041adcf008089379473eb9c1ea5a823f841e4 SHA-256: fcb277d3e1a6b2c7623b092d89131006476719e99fab231829d6cd0285169128
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to attract traffic or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URL and the PDF_SEO_LINK_FARM heuristic confirm the presence of numerous external links, with one specific URL being `https://jacksth.ru/strik?utm_term=need+for+speed+most+wanted+2012+free+download+for+pc+windows+xp`.

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 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.
  • 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://jacksth.ru/strik?utm_term=need+for+speed+most+wanted+2012+free+download+for+pc+windows+xp PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476285/normal_60187be2738f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457847/normal_5ff462b38e12e.pdfIn PDF document text
    • https://vadurevagide.weebly.com/uploads/1/3/3/9/133999829/1575748.pdfIn PDF document text
    • https://lamerosezikane.weebly.com/uploads/1/3/1/4/131411411/6705708.pdfIn PDF document text
    • https://sotemupavunu.weebly.com/uploads/1/3/1/4/131413148/fiwubuvu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502920/normal_5fcdcd7d3ad67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366632/normal_5ff3718988cef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494139/normal_6000dda9df514.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415322/normal_606d5ba38097d.pdfIn PDF document text
    • https://zuseninin.weebly.com/uploads/1/3/4/6/134606702/49ac08762932cb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467955/normal_601ad39340cef.pdfIn PDF document text
    • https://taxonegumogel.weebly.com/uploads/1/3/5/3/135330056/e01f0.pdfIn PDF document text
    • https://jojurofi.weebly.com/uploads/1/3/4/6/134666092/kabefapuw-wilevubitafa.pdfIn PDF document text
    • https://lafasajuju.weebly.com/uploads/1/3/4/0/134017903/xilotovixu-guguzunozudewa.pdfIn PDF document text
    • https://kudokazapa.weebly.com/uploads/1/3/1/4/131452939/faxofepomirape.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451221/normal_60401950b8003.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/6571c34a-aa8c-4f05-82e0-4e79b4a0a533/811052439.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6592388c-6e51-4be9-ac17-c2305892a41d/futoxobusasisifefivek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de424a37-f7d1-4542-95c2-a4475acb271f/whirlpool_gold_dishwasher_troubleshooting_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2994d2bf-508a-461b-b047-efd4c246f4a4/20976264230.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55B 5756 bytes
SHA-256: 6bbd49b571ae4f4207016821eeb97ae266edcb357558a427a4d3d016bded5da6
font_01_sfnt_off0000f8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FC 2512 bytes
SHA-256: 4dce65651168509d23c29733f7150cf533a8e6ef747e4a2aebe96b50709536f0
font_02_sfnt_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 10416 bytes
SHA-256: d158e8a7bf30fe2046c6dc7daf1b4345c99c7c6031af49f37699d4e6d23d2d1b

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