Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a8a4e153d65e52…

MALICIOUS

PDF

104.0 KB Created: 2021-02-10 06:59:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5df6672d86c7bf792bd9ccb7a362363d SHA-1: a356fe69a4443c8f4e305e42593d529f98f11dab SHA-256: c8a8a4e153d65e52ee164a9f2a1806e36ecb8ea7ef4cae48685d2f68f733d6ce
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/123?utm_term=red+cliff+indian+reservation+wisconsin PDF link annotation
    • https://cdn.sqhk.co/javeduner/hgcjagi/jowafu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447884/normal_5fffcc0fbed9c.pdfIn PDF document text
    • https://cdn.sqhk.co/kelopifagisu/WFIhchc/16519297363.pdfIn PDF document text
    • http://cardio-active.site/xexitultz8wq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380405/normal_5fe34316dfb64.pdfIn PDF document text
    • http://rapalafipotofuw.iblogger.org/fuziduvatunisidatuwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503035/normal_5fd896c5a48d5.pdfIn PDF document text
    • http://avbox.org/16632609884ug37f.pdfIn PDF document text
    • http://vashmaster.info/b._ed_degree_certificate_form_kashmir_universityc16w6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://repibikapowa.epizy.com/my_whatsapp_status_app.pdfIn PDF document text
    • http://faxunininenif.epizy.com/21095155371.pdfIn PDF document text
    • http://temomuduzuba.epizy.com/52655748496.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13875 10360 bytes
SHA-256: f87f5dd4f9db16c221ca51040b4e2bc96b94cc8c8020ef4e4c344ba8ffad6e31
font_01_sfnt_off00015a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A5B 5172 bytes
SHA-256: 7792320f00f90f1521442be8f5783ef408c774f5ee706606b100a85d10291cc6
font_02_sfnt_off00016c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C1C 11476 bytes
SHA-256: 5644376b992ae50a3699766be22722d90dd36378abefebb18d0f545084ea96f8

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