Malicious PDF — malware analysis report

Static analysis result for SHA-256 57040bf6f5ff9120…

MALICIOUS

PDF

78.3 KB Created: 2021-02-17 20:23:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fb0466929f434913974ea8996350ac29 SHA-1: aee729e62c4b6a5d8b8427e567d901667224dc5c SHA-256: 57040bf6f5ff91202d78556bfc6e037e3fab16cd64c3992ad5f41b4b430a0b2a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various external PDF files. The primary URL, https://maypoin.ru/strik, suggests a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://maypoin.ru/strik?utm_term=binomial+distribution+example+questions+and+answers PDF link annotation
    • https://zefijevizo.weebly.com/uploads/1/3/2/3/132302816/6419739.pdfIn PDF document text
    • http://ouily.xyz/title_video_background_freewui29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484370/normal_60124209e2d9c.pdfIn PDF document text
    • https://jumirusuvowelu.weebly.com/uploads/1/3/4/6/134632856/141f0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367680/normal_5ffaa3d85a7ab.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/VEfbLjf/16773690930.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486523/normal_601b38a24274b.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/aiajcVO/3274553653.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369916/normal_600fd886ba95c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/saxefi/pigasukasaranu.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/android_10_update_for_vivo_mobiles.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/bump_of_chicken_hello_world.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/petesaronogetolaba.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_off0000f1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 5580 bytes
SHA-256: 94e2c1d87c43f42ebe4dd76059ceaad8e676751859ab91d1ebd337df4370083d
font_01_sfnt_off000104a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A1 12604 bytes
SHA-256: 05537e1b9beb5152f8c5d320a537a43882edd3f69f4d564f77d9184cc0654245

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