Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18a26d3a492bd7d…

MALICIOUS

PDF

65.4 KB Created: 2020-12-19 22:40:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f5ef3bb7f47f45c547c661be30c9a00d SHA-1: bb8a06a21f857fa843e24f37b6dc2d4c8cca387e SHA-256: f18a26d3a492bd7d1c8e1ed831b6981b4a36f77b1e735502c7e234a635cccc9d
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The document uses a fake invoice lure and a download button to trick users into clicking a malicious URL. The presence of multiple external URIs, many hosted on disposable domains, suggests a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/aws?utm_term=gst+calculator+india+excel+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368742/normal_5f8b042a638be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366367/normal_5fc2ccc9cb660.pdfIn PDF document text
    • https://komanibinepo.weebly.com/uploads/1/3/4/5/134588578/tupituzefem_givexufefosil_kulotofoluwexe_desewolivoji.pdfIn PDF document text
    • https://foraketarikovef.weebly.com/uploads/1/3/4/6/134608655/a937e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376611/normal_5fb609d50c3a9.pdfIn PDF document text
    • https://zisatusomet.weebly.com/uploads/1/3/4/8/134872515/mofulupu-funofi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366341/normal_5f8bef0b1cef5.pdfIn PDF document text
    • https://jorosovepi.weebly.com/uploads/1/3/4/7/134706332/vaseke_razelibibaloniv_fifojajuselu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370989/normal_5fa26a713ce2e.pdfIn PDF document text
    • https://dupevikalibo.weebly.com/uploads/1/3/4/6/134659617/5ea40.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/kegubinefuda/asco_guidelines_nausea.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a5afcf0-f2f1-4bbc-833b-e197058686f4/tujipetiboziginida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa70c6cf-2454-4c4c-95be-0c201f1d4d28/tipo_de_grupos_juveniles.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_off0000c1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E3 5316 bytes
SHA-256: c38f4e9fae72789952792e483152e50a22ddbf5cf2c0076435ee7e18284f81ba
font_01_sfnt_off0000d3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EA 10836 bytes
SHA-256: b272e040e0a06e2334fce9ca994d176cd4ce11543d8519d4369170ce1375f5dc

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