Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad928526f3034a0b…

MALICIOUS

PDF

72.5 KB Created: 2021-01-12 11:21:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: f078c0d2b49023eff3a422495d9ff53e SHA-1: 237651bd85c95d961fb16168acf84c44c045dbf9 SHA-256: ad928526f3034a0bd3fe4e748684f1df063513e74502eae959c1b4311dcd59a4
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be a lure related to iPhone text message issues, directing users to external URLs. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly indicates a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wb?keyword=text%20messages%20not%20downloading%20on%20new%20iphone PDF link annotation
    • https://vosewisujar.weebly.com/uploads/1/3/5/3/135398140/2255459.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450240/normal_5fc98b02d12ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495385/normal_5fccd3cd9f5fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393356/normal_5fb4d10858fb7.pdfIn PDF document text
    • https://nunoperiv.weebly.com/uploads/1/3/1/8/131856708/cb646a15d981823.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/2LKdpic/xalafobitemovivoworagufil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458389/normal_5fc44dba50888.pdfIn PDF document text
    • https://cdn.sqhk.co/vedanoderifu/Yij94gj/14030714369.pdfIn PDF document text
    • https://cdn.sqhk.co/totudavomud/Wgfuhar/samsung_calculator_apk_for_marshmallow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368777/normal_5f9a762464614.pdfIn PDF document text
    • https://site-1172726.mozfiles.com/files/1172726/11226068174.pdfIn PDF document text
    • https://nijoriduzi.weebly.com/uploads/1/3/2/3/132302782/zunubamisofej.pdfIn PDF document text
    • https://site-1168346.mozfiles.com/files/1168346/8030021099.pdfIn PDF document text
    • https://cdn.sqhk.co/waximanodif/bhfZN9h/kart_stars_mod_apk_1._12._5_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000deb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB3 5388 bytes
SHA-256: 323efeeefcfde096746deaaf0751e661fae58510172eb5468ab8fe5020291a3c
font_01_sfnt_off0000f0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F7 10328 bytes
SHA-256: 3ad24f3abed8693484d4a80d9045df09a4f394e5757d3be5ef810966a0ae50af

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