Malicious PDF — malware analysis report

Static analysis result for SHA-256 628e53c76b047170…

MALICIOUS

PDF

74.9 KB Created: 2021-02-28 18:03:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f4e36a31bf8ddb50b5104fd3b637f7cb SHA-1: 3dc8dde23ff78877b5ddd24826ec7dda333d503d SHA-256: 628e53c76b047170d699436f787ee94968b4601d58592421eea3fceccd53a4d2
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

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 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://jacksth.ru/wb?keyword=toner%20for%20hp%20lj%202100 PDF link annotation
    • https://dorizusedi.weebly.com/uploads/1/3/0/7/130776489/fapopu.pdfIn PDF document text
    • http://lynciguest.com/70159053977rj733.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404285/normal_601990d0ae174.pdfIn PDF document text
    • http://fobifisoba.22web.org/chesnara_plc_annual_report_2017.pdfIn PDF document text
    • https://filavemegu.weebly.com/uploads/1/3/4/8/134883773/jisifegaromoviv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415327/normal_5fda4af726452.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446036/normal_5ff4ecd91d4e1.pdfIn PDF document text
    • http://normab-id.com/naruto_shippuden_kizuna_drive_for_psp9j0nj.pdfIn PDF document text
    • http://puvepum.getenjoyment.net/el_hijo_horacio_quiroga_analysis.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/rurenomokukavaxokel.pdfIn PDF document text
    • http://uablog.website/bafebonikaxarasusikogadgl2tx.pdfIn PDF document text
    • http://jeruxawi.iblogger.org/material_dashboard_pro_angular_2_free.pdfIn PDF document text
    • http://siwupojotuj.getenjoyment.net/aci_318-14_minimum_shear_reinforcement.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426257/normal_60181340a1141.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470540/normal_5fc5bc4e06645.pdfIn PDF document text
    • http://ig-copyrightviolation.com/acer_aspire_one_battery_plugged_in_not_charginglkfvm.pdfIn PDF document text
    • https://badosesidexezub.weebly.com/uploads/1/3/0/8/130874160/werij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://birofasadonu.epizy.com/chuck_tingle_books.pdfIn PDF document text
    • http://pigutun.myartsonline.com/62742016540.pdfIn PDF document text
    • http://dowirimidezifa.rf.gd/guides_for_brides.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_off0000e6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B2 4952 bytes
SHA-256: 13968de4a03f62c380293e7a8b7cd34a7a4f4a40471edbae2834a0fed5983db8
font_01_sfnt_off0000f797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF797 10892 bytes
SHA-256: 4e59d04982d544e92b689945202f6597708b5460e037cfc3b2427152e34550b9

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