Malicious PDF — malware analysis report

Static analysis result for SHA-256 acec9fa28cd5a351…

MALICIOUS

PDF

72.6 KB Created: 2021-01-08 14:26:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f2ec1e5e0611acc8e3d1f71072ad3f77 SHA-1: f4811179f2555d723fc064d191ad1d44af170265 SHA-256: acec9fa28cd5a351b401da259cecd36c7d2c0d456be42e27e122e5f47a172fdb
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that likely lead to further malicious content or phishing sites. The presence of external links and the PDF structure suggest an attempt to redirect users, potentially for SEO manipulation or to deliver a secondary payload.

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://trafftec.ru/wb?keyword=sword%20of%20chaos%20machtklinge%20aktivierungscode PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450439/normal_5feb480e53369.pdfIn PDF document text
    • https://pibofarijefi.weebly.com/uploads/1/3/4/6/134648305/4564336.pdfIn PDF document text
    • https://luseviji.weebly.com/uploads/1/3/5/2/135298280/764816.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476757/normal_5fe54f5d0a44a.pdfIn PDF document text
    • https://serofijukepaba.weebly.com/uploads/1/3/4/6/134693026/wejigorulozis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501361/normal_5ff4c7ec4056a.pdfIn PDF document text
    • https://cdn.sqhk.co/faxiwapa/eifgdzT/megabus_orlando_to_miami.pdfIn PDF document text
    • https://xajasirofoxuki.weebly.com/uploads/1/3/5/3/135330212/rikejoxosemu.pdfIn PDF document text
    • https://gaditefu.weebly.com/uploads/1/3/2/7/132712385/b9acfe6f.pdfIn PDF document text
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/buwurizur.pdfIn PDF document text
    • https://tonurokekar.weebly.com/uploads/1/3/4/4/134456200/revufomejidi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377938/normal_5fe764f4e893e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474736/normal_5fd1f9db7199d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379483/normal_5fa97428b0d02.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_off0000dc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC17 5752 bytes
SHA-256: 2ee486c1c6e87c45b53ddb0ea9e885e65c357abf16edcb36e7f89a8a3c45e523
font_01_sfnt_off0000efa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA1 11036 bytes
SHA-256: 2243876b77d30cd195ce775cd46b68f86419f8cded68e781218a2b8ea92b0b65

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