Malicious PDF — malware analysis report

Static analysis result for SHA-256 20456eb4e28ef2f0…

MALICIOUS

PDF

71.3 KB Created: 2021-01-10 07:31:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 693c30705bffd4f864a21bfb9f09bd4c SHA-1: 2b0e428d4ec251174b6a821595ab46e5a7fab363 SHA-256: 20456eb4e28ef2f0e7db78af28f671d80a84dc4cd8d929a76cd25ee6d0242890
186 Risk Score

Malware Insights

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

The PDF file contains a link farm with multiple external URLs hosted on disposable domains, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a high volume of links, and 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' confirm its malicious nature. The primary lure appears to be 'root external 2 internal sd card apk download', directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://trafffi.ru/123?utm_term=root+external+2+internal+sd+card+apk+download PDF link annotation
    • https://letateworu.weebly.com/uploads/1/3/4/3/134365764/2f7ec750f9fc62c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452389/normal_5fd8787c03dd3.pdfIn PDF document text
    • https://zagukosi.weebly.com/uploads/1/3/4/3/134314994/1613db478c7b18.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/SPjhjgY/gameboy_color_link_port.pdfIn PDF document text
    • https://loruwudo.weebly.com/uploads/1/3/4/7/134738316/turile.pdfIn PDF document text
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/5245467.pdfIn PDF document text
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/jevimoguzona.pdfIn PDF document text
    • https://cdn.sqhk.co/fasixazijaz/jgfjjqu/zombs_royale_io_sandbox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501201/normal_5fd6cf50d7ae0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366984/normal_5fe7f18773642.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/resisuna/10_point_review_of_systems_template.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_off0000d7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FA 5428 bytes
SHA-256: 1a416d42ec966744bb07c653c68d015a04fcf13ed8421e4df8021a600247e7a3
font_01_sfnt_off0000ea9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9D 11200 bytes
SHA-256: 345d0a9636fc402475a74e8a375afa3432f6f55a4fe1f9481a8d49345e131b48

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