Malicious PDF — malware analysis report

Static analysis result for SHA-256 8393dd1679a7581f…

MALICIOUS

PDF

79.5 KB Created: 2021-05-22 03:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4f6209aff6be7508b98cfcfbb8fb623 SHA-1: 7322d9dc820cf812d3195624375e912daf881c8b SHA-256: 8393dd1679a7581f6f1c9438f6a58f123aedf28a0da5ea75efed9106f0244fc3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, forming a link farm, with one prominent URL pointing to 'baarspo.ru'. The document body is heavily obfuscated and appears to be generated content, likely to mask the malicious intent of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=does+tubal+ligation+make+u+gain+weight
    • https://cdn-cms.f-static.net/uploads/4483335/normal_5fd8099267872.pdf
    • https://vosasavowaje.weebly.com/uploads/1/3/4/5/134587316/8781470.pdf
    • https://tekevifumufov.weebly.com/uploads/1/3/0/7/130739519/8283031.pdf
    • https://static.s123-cdn-static.com/uploads/4451949/normal_5fe439a974261.pdf
    • https://rigopodi.weebly.com/uploads/1/3/4/3/134307943/tixuzesupuvun.pdf
    • https://cdn-cms.f-static.net/uploads/4422876/normal_6056d68d2c286.pdf
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/kapilu.pdf
    • https://cdn-cms.f-static.net/uploads/4481155/normal_601d830da3f25.pdf
    • https://cdn-cms.f-static.net/uploads/4393776/normal_601f89bab00e3.pdf
    • https://static.s123-cdn-static.com/uploads/4486041/normal_600301fc9f39b.pdf
    • https://static.s123-cdn-static.com/uploads/4383804/normal_5ff63ae7b79e5.pdf
    • https://static.s123-cdn-static.com/uploads/4425929/normal_5fde7f2eaa9be.pdf
    • https://cdn-cms.f-static.net/uploads/4391642/normal_604874af789dc.pdf
    • https://fusorebumobem.weebly.com/uploads/1/3/3/9/133986296/34b818941.pdf
    • https://cdn-cms.f-static.net/uploads/4416500/normal_60657672cd249.pdf
    • https://cdn-cms.f-static.net/uploads/4368489/normal_60694e653070d.pdf
    • https://xenexaguvu.weebly.com/uploads/1/3/4/2/134265948/1802832.pdf
    • https://funofumid.weebly.com/uploads/1/3/4/8/134886651/ludaf.pdf
    • https://cdn-cms.f-static.net/uploads/4484107/normal_600eaec31c34c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rogugagatuf/sifokiwuzodufopa.pdf
    • https://s3.amazonaws.com/dudurat/87831160231.pdf
    • https://s3.amazonaws.com/luborinizu/24650600225.pdf
    • https://s3.amazonaws.com/bulolimepol/honda_125cc_dirt_bikes_for_sale_near_me.pdf
    • https://medlineplus.gov/tuballigation.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f978.bin
318ac4dfd5b62d3aefbf87dc0c22caf23831b52eb88508812594a8e5fea26ed6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF978 5296 bytes
font_01_sfnt_off00010b74.bin
739603cb7c7d16bbed3447617383a604985a360e699874aefc729352208e30ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B74 10784 bytes

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