Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d9d561930375d2…

MALICIOUS

PDF

73.0 KB Created: 2020-11-22 09:42:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 4fd75df1b75cf179f401c041194097d4 SHA-1: 4cc54b38523c08e1aa97edcb0aa795af86c4c6fa SHA-256: 50d9d561930375d245dcd0270dad16a21fc989430cb47bd5f4088a037de0ae66
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The PDF contains a mass of external links, identified as a 'PDF_SEO_LINK_FARM', with the primary suspicious URL being https://trafffi.ru/123. This suggests the document's purpose is to redirect users to potentially malicious or unwanted content, masquerading as a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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/123?utm_term=hierba+mala+nunca+muere PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419211/normal_5f9691fa3196e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412763/normal_5fb529417d993.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422137/normal_5faa0140ae74c.pdfIn PDF document text
    • https://junoxavod.weebly.com/uploads/1/3/1/3/131384771/leragabisib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379852/normal_5fa0cb01672b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379846/normal_5fafee2034de0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/risalenefazozo/zobixesakotekujowenute.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/baromofizawizasuguzetad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ed896fc-b25c-421d-b1df-d5a0eea2d8ce/speak_laurie_halse_anderson.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/princess_mononoke_ashitaka_and_san_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/amazon_alexa_auto_answer.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_off0000d243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD243 4560 bytes
SHA-256: 12e72c8d13da97ab0b522d73479dc5944d9510d0c62518397bb766ff4a613b7d
font_01_sfnt_off0000e186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE186 11648 bytes
SHA-256: af715e0a3cefbd7daf12629b3dec5aed4c12f11467fa56e9b591d8f0a162071f
font_02_sfnt_off00010779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10779 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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