Malicious PDF — malware analysis report

Static analysis result for SHA-256 828072fe8aba7a63…

MALICIOUS

PDF

101.6 KB Created: 2021-02-24 03:21:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5febaadd945088c0458c487ed5595eb1 SHA-1: ccf6aaddcc37976ab6b903f9cd54db95cfcd698a SHA-256: 828072fe8aba7a63b93ea31a7a7c667bdcd62e0945a32096173bb1953b9ed348
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jottigo.ru/123?utm_term=humminbird+859ci+hd+reviews PDF link annotation
    • https://zetovesejideze.weebly.com/uploads/1/3/1/4/131482946/nigexunaleginukotosi.pdfIn PDF document text
    • http://birjand.design/gobububmd7.pdfIn PDF document text
    • http://wozutujetotox.iblogger.org/3179352876.pdfIn PDF document text
    • https://cdn.sqhk.co/ximegawaso/cmkihjh/dirt_xtreme_mod_apk_1._4._14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://daxevetefixidaj.epizy.com/13088748115.pdfIn PDF document text
    • http://fepesori.rf.gd/15184370499.pdfIn PDF document text
    • http://vedisupekak.epizy.com/genunamis.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/risomamop.pdfIn PDF document text
    • http://sabofakulivibav.epizy.com/software_development_methodologies_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/300_common_spanish_words.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_off00014a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A4A 5664 bytes
SHA-256: fcb150d64a114993ea1642b714acda82a36b53b73b1b44e36a443bf2b00fbc36
font_01_sfnt_off00015d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D7F 13104 bytes
SHA-256: f1f26d012cf67a5fe0f96dc378ab4ff8b20e7a00c1999416d308734c353abe86

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