Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b9d65b7515f9adf…

MALICIOUS

PDF

61.3 KB Created: 2021-01-08 15:24:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ffd4f486cde31aa8d6cff7df03b5215e SHA-1: 77bc47e4cc3b89b413523bc0ba0a80903a0e8a9c SHA-256: 6b9d65b7515f9adfb9bbf32a5554b54d175ce58d4d571c29b2e0fa16957505c3
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

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
  • 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 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.
  • 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://ggtraff.ru/123?utm_term=energy+through+ecosystems+worksheet In PDF document text
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/nuluri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422890/normal_5fb5bf143c72d.pdfIn PDF document text
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/suravujonebi-timasi-tajezal.pdfIn PDF document text
    • https://buvonidodiwa.weebly.com/uploads/1/3/4/3/134332647/7f34c2662.pdfIn PDF document text
    • https://nifufoji.weebly.com/uploads/1/3/4/4/134458522/zogozavojilale_vawosumul_vejuteripata_losef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450048/normal_5fad818380305.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/baby_girl_images_hd_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/best_bootstrap_navbar_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/action_plan_google_doc_template.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/lixemowipokusogopew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5db3e66c-b928-4644-81d8-05697f170600/beery_vmi_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58699ecb-294d-4912-859c-083c1b1cb550/sikalokoziw.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_off0000b4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C9 5184 bytes
SHA-256: 8c6c31eb7f2929253d940198ddf6cf7a7abc21be289ad3614c7253aabb63153e
font_01_sfnt_off0000c669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC669 9988 bytes
SHA-256: 28e4e4f5c9a12f1b4347b8c47448cf1b7c28f0b44e0de230bbda6dab5d7ae09a

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