Malicious PDF — malware analysis report

Static analysis result for SHA-256 833c9af4b261f1b6…

MALICIOUS

PDF

93.6 KB Created: 2020-11-11 11:28:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2192401554b36a1a44d357694c6fab4d SHA-1: 448338820be6ae3c53a2244ac01b5b73b6775990 SHA-256: 833c9af4b261f1b6200596722ad4e43b4e5e2a2a5a827e4cef3af35dd3149116
186 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 high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded JavaScript, though not fully analyzed here, is often used to redirect users or execute further malicious actions.

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?keyword=danny+devito+space+jam+character PDF link annotation
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/6565169.pdfIn PDF document text
    • https://nidixinaxob.weebly.com/uploads/1/3/0/7/130739699/5341408.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384048/normal_5f93f40db8d54.pdfIn PDF document text
    • https://rozenawaxu.weebly.com/uploads/1/3/4/5/134517597/bevilorumafarez-fosiwofazudude-palejokemi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_5f9792c75db78.pdfIn PDF document text
    • https://dajegasizof.weebly.com/uploads/1/3/4/4/134469490/gowizuk_vitusuku_migelejev_tejas.pdfIn PDF document text
    • https://togimapobeno.weebly.com/uploads/1/3/4/6/134649298/zobigabesutipuk-vonabutomofedab-sanovixuleziko.pdfIn PDF document text
    • https://guboriratuji.weebly.com/uploads/1/3/4/2/134235556/gajunowavibo.pdfIn PDF document text
    • https://pefobasor.weebly.com/uploads/1/3/4/1/134131397/bitazuxisulebalijes.pdfIn PDF document text
    • https://tefifegewa.weebly.com/uploads/1/3/4/3/134335978/182627.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409395/normal_5f966b3d97587.pdfIn PDF document text
    • https://soremezu.weebly.com/uploads/1/3/1/0/131070226/4e68f731fa6ca6e.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_off00012f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F79 5516 bytes
SHA-256: b9b837b0890119945cdf47b57a46f1337e6958d6c3716ed63006efaf75452ad9
font_01_sfnt_off00014227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14227 11620 bytes
SHA-256: e2f5af9c742f4e664a00cc20533e0077e3794dc8ac713f9790cd1217c837d2b7

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