Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ae636aa3604f665…

MALICIOUS

PDF

128.1 KB Created: 2020-12-22 11:50:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5780e31e2e3c0d7eca5b61723281577a SHA-1: 90f6a1016d3cb8d7c11c7f75c7054b36f28b3d7a SHA-256: 0ae636aa3604f6658ed8bd8c0f9fc9c00193b18b6e8c301dd25aea852340062b
244 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm or phishing lure, with numerous embedded URLs pointing to various external sites, including a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the extensive use of external links suggests an attempt to redirect users to malicious content or phishing pages.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=gw2+necromancer+armor+guide In PDF document text
    • https://varudigenaka.weebly.com/uploads/1/3/4/5/134597471/ede4afe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425507/normal_5f9bdf88149c4.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/bewobabotidigeb_tunenijidivazuf_matafeme_tipisiditenevaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410013/normal_5faf7e4a64eaa.pdfIn PDF document text
    • https://tamilazubi.weebly.com/uploads/1/3/4/6/134604156/fokoro-fobadibasafa-wumubimane.pdfIn PDF document text
    • https://dasujodiket.weebly.com/uploads/1/3/4/4/134481559/fipedeti.pdfIn PDF document text
    • https://kopezemab.weebly.com/uploads/1/3/4/3/134339977/2058756.pdfIn PDF document text
    • https://keduwiwisa.weebly.com/uploads/1/3/4/4/134486116/bidoleredipenexujaze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369146/normal_5f9530f1bbcfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484820/normal_5faa6c662dc83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369764/normal_5f8a005ec512a.pdfIn PDF document text
    • https://nobuzuza.weebly.com/uploads/1/3/4/7/134757083/fiwenepevumurob-vopadobedutav.pdfIn PDF document text
    • https://tatabano.weebly.com/uploads/1/3/4/8/134850833/0e44f6daa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0970212-7800-437f-80fe-171c91a36e81/nosuka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aed71650-c00f-4ed3-887a-c4b9895c009d/riputodekaram.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_off0001bc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC36 5304 bytes
SHA-256: e093d42cb1be0fc57c5347445860b17ffc51e34ff64144400ae911e524c67316
font_01_sfnt_off0001ce42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE42 11008 bytes
SHA-256: f482461bfcc46e1c8cc9d5e8708db4897b1732c6f2f08fa47f9aea9e9d41e3be