Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7bfbf24b18108b…

MALICIOUS

PDF

75.2 KB Created: 2021-03-12 01:17:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: aed66799c2d931885c7892358247eded SHA-1: 6441238aaa7720e9df8360c1e4352d8543f913ba SHA-256: aa7bfbf24b18108b0b089c8497b63f902b46065df8da3918208f63c40fad0280
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://dugedepap.ru/award?keyword=mathematical+finance+course+pdf PDF link annotation
    • http://helplnstagramcontact6088757.com/97380549735q3efi.pdfIn PDF document text
    • https://midejewafefo.weebly.com/uploads/1/3/4/0/134000268/kakimakiwamava.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418587/normal_603d421894701.pdfIn PDF document text
    • https://tiwirekofer.weebly.com/uploads/1/3/5/3/135314588/2a3a64037f67f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485443/normal_6029fa0a89755.pdfIn PDF document text
    • https://sofotegepure.weebly.com/uploads/1/3/4/5/134522016/78c138.pdfIn PDF document text
    • http://findssldz.xyz/red_ball_game_1bbq67.pdfIn PDF document text
    • https://tipirigemiwar.weebly.com/uploads/1/3/4/0/134016889/robukije.pdfIn PDF document text
    • http://proflist-kursk.ru/rebesokudadidopalewanaws9at.pdfIn PDF document text
    • http://sewonmedix.ru/begubogazarekunoxidaliron8n.pdfIn PDF document text
    • https://vorupegesozuzow.weebly.com/uploads/1/3/1/4/131453293/zuxumilofuxudav-kekebonifefa-difudena.pdfIn PDF document text
    • http://helplnstagramcontact6088756.com/puzulevubeyex0.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/c99d4575-ed45-413c-af9e-8267c96e71e9/zimasifura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7c4add0-20de-4023-8e6c-7645cf8bdd7a/36899914070.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/85321855827.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/lopikulisoxifeve.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/google_play_games_latest_apk_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b0c9640-0dd5-452d-9336-d63b08add89d/reading_comprehension_worksheets_grade_4.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_off0000e866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE866 5400 bytes
SHA-256: 3fe3cf6e32a0e8f78a992495332037b2d4af8c2f87a9befe23e95a7bf9b2ef61
font_01_sfnt_off0000faa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA8 10884 bytes
SHA-256: 115baa882665617069656626b3d30cebb38d75ba5ac61aaa726263bc41dd2e1b

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