Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcfae1d00e30cd1e…

MALICIOUS

PDF

70.0 KB Created: 2020-12-17 06:31:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 931c99c0a3057d83c13f95618f821867 SHA-1: 3e59be007a766f48bda7dfa388afabd54a513cff SHA-256: dcfae1d00e30cd1e20b612c659f362621349812ac141c1eb75cc9fe85a06aa31
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs and the PDF's structure are consistent with a tactic to obscure the true destination and purpose.

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://trafficel.ru/aws?utm_term=castleford+tigers+match+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403408/normal_5fb27be28678d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389106/normal_5fae66971bf00.pdfIn PDF document text
    • https://wejibuxod.weebly.com/uploads/1/3/0/7/130740202/wusepokolukekoteneza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376869/normal_5f8f33d166f15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495040/normal_5fc50f8e1d51c.pdfIn PDF document text
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/2332101.pdfIn PDF document text
    • https://pajenugemin.weebly.com/uploads/1/3/4/6/134677616/bd15dcdfd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5fd7ba9866819.pdfIn PDF document text
    • https://disadoxamegipu.weebly.com/uploads/1/3/4/5/134527150/sudiga_perakor_nerisosera_vodaru.pdfIn PDF document text
    • https://tamilavijunaw.weebly.com/uploads/1/3/4/5/134506647/1908581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387060/normal_5fa8bb404f07d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410433/normal_5f9a095084060.pdfIn PDF document text
    • https://fovivijidilel.weebly.com/uploads/1/3/4/8/134888041/01858ab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42C 5476 bytes
SHA-256: b0d25a5d2fb3201afe8fd0c0e5553504b1341d8e6ccfe62e62a0d68e3287c83a
font_01_sfnt_off0000e69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69E 10744 bytes
SHA-256: d754bec9a4ad3eb945268841c64f43b18ef987f2699289d239f0397a1378e2f0

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