Malicious PDF — malware analysis report

Static analysis result for SHA-256 edaf01517b76d0f8…

MALICIOUS

PDF

77.4 KB Created: 2021-02-28 05:58:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 59d8ee6300777225ffd214a4a8620b22 SHA-1: 5e3a920b7714833605da435c97b8cb7847ae50bd SHA-256: edaf01517b76d0f8777249c4e124bc3e6d4837e39a333a7736d72429dde210d6
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. One critical heuristic firing confirms the presence of a PDF redirector link to known malicious infrastructure. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

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
  • 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://dafemum.ru/aws?utm_term=haier+mini+fridge+thermostat+settings In PDF document text
    • https://vedabigejiko.weebly.com/uploads/1/3/1/4/131438046/6536302.pdfIn PDF document text
    • https://lebudikex.weebly.com/uploads/1/3/5/3/135310552/8535427.pdfIn PDF document text
    • http://coolmag.biz/38825149337gx09l.pdfIn PDF document text
    • http://ouily.xyz/rapukobebovowibisirawivepbwsf9.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/cessna_172_maintenance_checklist.pdfIn PDF document text
    • http://constructionhouse.info/ethical_guidelines_in_clinical_research_pptm5khn.pdfIn PDF document text
    • http://dorightschool.com/pathology_mcq_free_downloadf07c9.pdfIn PDF document text
    • https://kowulenube.weebly.com/uploads/1/3/2/7/132740682/gatudofajiruz-fofewa.pdfIn PDF document text
    • http://health2health.online/pulibawaganubutujikit8s45b.pdfIn PDF document text
    • https://tagakokiginozol.weebly.com/uploads/1/3/0/7/130775172/d0b2a32b.pdfIn PDF document text
    • http://unreguezff.rest/how_to_solve_by_simplex_method4y6d0.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/how_much_to_paint_a_cessna_182.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wutowaxodod.epizy.com/interim_report_card_template.pdfIn PDF document text
    • http://vilepobafomunow.atwebpages.com/how_to_fix_braun_thermometer_pos_error.pdfIn PDF document text
    • http://vawirir.atwebpages.com/81746985667.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_off0000f302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF302 5252 bytes
SHA-256: ffd1a4841fae1b904d16d160ce008770fa0fb4ebb90d3499fb201707eaef9be5
font_01_sfnt_off000104b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B5 10372 bytes
SHA-256: 2172cf2093e2698e822268b0977a8eaa59bde23dd2829d2af176c3bf2943ca02

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