Malicious PDF — malware analysis report

Static analysis result for SHA-256 567ac2b3661f827e…

MALICIOUS

PDF

69.2 KB Created: 2020-11-18 06:39:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1bde923d7b1dc71af6036e1fbe34dbcf SHA-1: e8ac6f4e4594436be338cd480b15716695bf77d8 SHA-256: 567ac2b3661f827ec4b8346cf15fa67b48d6ccb0d23e4ac46bf6b5690406b95b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains numerous embedded links designed to redirect users to malicious websites, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection further confirm its malicious nature. The primary attack pattern involves leveraging these links to deliver phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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://traffine.ru/strik?utm_term=lenovo+ideapad+s10-+2 In PDF document text
    • https://tekegalesi.weebly.com/uploads/1/3/0/7/130740489/5125059.pdfIn PDF document text
    • https://wefolukozik.weebly.com/uploads/1/3/1/4/131406413/817e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382782/normal_5f9866e8db2bf.pdfIn PDF document text
    • https://bimenejujuw.weebly.com/uploads/1/3/4/5/134592033/3606952.pdfIn PDF document text
    • https://tovepeluzon.weebly.com/uploads/1/3/4/3/134385389/musevasab-latudot-pipezirulawopif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471971/normal_5faba015d776b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5f8a07a40a6d4.pdfIn PDF document text
    • https://nesutidixet.weebly.com/uploads/1/3/4/7/134724555/556ba07f80ae428.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391921/normal_5f9306526885f.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/1a27643b41869.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/d7230c3e-21f9-49b4-9c2d-879f0a77b591/24937283028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76990517-2643-4b02-bb6e-d1ac4824b1a3/42033195503.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21808aed-17db-4413-bbb9-e0a559206977/foviwelixiposurebavak.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_off0000d3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DB 5184 bytes
SHA-256: 52d5398c6108f65bd250eacabeca29746e948feb44ed266e2ba01e196df2e063
font_01_sfnt_off0000e5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A6 10148 bytes
SHA-256: dcbf9426a180605dec63547ca8bbe5afa192fbda7f86b36208508c46cd8ae25d

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