Malicious PDF — malware analysis report

Static analysis result for SHA-256 df434ae07454c8cb…

MALICIOUS

PDF

78.1 KB Created: 2021-02-26 08:35:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0ef42474e636287d44517b93fde29e6f SHA-1: d5e069262608bcfee587128ea0bfa08da801184d SHA-256: df434ae07454c8cb1cd1c0597cb7599f814678081b7fc51a1bb697eacba28748
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 pointing to disposable domains, suggesting a link farm or SEO manipulation tactic to distribute malware or phish users. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's primary purpose is to redirect users to potentially harmful external sites.

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://leonvi.ru/strik?utm_term=how+to+replace+samsung+tab+4+battery PDF link annotation
    • https://cdn.sqhk.co/jomutepe/ajj4rjf/ralituzeribipipew.pdfIn PDF document text
    • https://cdn.sqhk.co/vawapisoxe/fjjiajc/kezupigurexavabezex.pdfIn PDF document text
    • http://falopeliti.22web.org/clash_royale_hack_apk_unlimited_elixir.pdfIn PDF document text
    • http://lastmarkt.ru/angular_4_file_from_urlr7k6u.pdfIn PDF document text
    • https://cdn.sqhk.co/posebozej/NAHbjgC/bopemivusa.pdfIn PDF document text
    • https://cdn.sqhk.co/wifavizen/2mgihh1/anime_gif_wallpaper_pc_4k.pdfIn PDF document text
    • https://famepajovajegow.weebly.com/uploads/1/3/1/4/131438188/baa57cc2baf7cc7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rirusivinudi.rf.gd/california_home_rental_agreement_template.pdfIn PDF document text
    • http://paporoj.rf.gd/jidago.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/nogokudoduragobone.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/tikevojepategunelepelo.pdfIn PDF document text
    • http://menivafanar.epizy.com/bolepu.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_off0000f42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42B 5636 bytes
SHA-256: 0657928a286f1396531088f225c0add3a7a935f0359751c9c3fee1de6997c8de
font_01_sfnt_off00010759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10759 10632 bytes
SHA-256: 3d9b4bed417d1132e8753a543c4951734c18820755b816df85f25329ec9f6ee5

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