Malicious PDF — malware analysis report

Static analysis result for SHA-256 7021b6fe9aa17384…

MALICIOUS

PDF

73.3 KB Created: 2021-05-28 08:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9799b466cc80eb1fdd71ad879576115f SHA-1: c5bf62f4c39d7d0f938d5a23fe48f23f5d4fefe3 SHA-256: 7021b6fe9aa17384a8ffcb3429f6aef64b7f5c52ab7df0ca7bfd1d9f684c4791
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary external URIs, 'https://soxebez.ru/strik', is likely a malicious redirection or phishing endpoint. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/strik?utm_term=list+of+short+vowel+words+with+blends+and+digraphs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412895/normal_605ef2cc423d6.pdfIn PDF document text
    • https://kisuwirabavaruz.weebly.com/uploads/1/3/3/9/133999170/6994a26bda04802.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4418191/normal_60b0586b2c18b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486041/normal_601715bcb40b1.pdfIn PDF document text
    • https://xitokudid.weebly.com/uploads/1/3/4/6/134688137/xezutikurodoji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453718/normal_606998c24c9b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458829/normal_60149f0d842f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370062/normal_602d66cf60f55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443602/normal_600a90176fc0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387054/normal_604ed5b4bb611.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483833/normal_5fe553dd70ea3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413475/normal_603912e508701.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/67ce1140-0919-483d-9dd1-5703e2f6030f/xegavitivulebopive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d12c96bf-c538-4dce-b8c2-fc8cc3208956/hp_laserjet_3015_fax_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f834e2f2-c708-4e02-9d99-cd2e586e24d7/5562087195.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d6c3b2d-ab1f-41a3-aa0e-9d03cbf62766/36444724644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/506e139e-bb76-4ee0-b395-dbcaaa112b4c/how_to_repair_a_stressless_chair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3f57f00-6a08-4187-adc7-84c7fdad142c/how_to_read_bass_guitar_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74bbd37d-4a4f-48bf-8fef-c9f746150de4/jamirisemelevizesib.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_off0000e26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26B 5536 bytes
SHA-256: c6b9a3af2331b1870af95f44fefa1c49ff034115293412e02e94c2236ca538dc
font_01_sfnt_off0000f54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54D 10364 bytes
SHA-256: 2b158c4186d7eefe8be978b0c99170035f2ba5c4c5f31f8d87c50a30441dfd3c

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