Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f955ef2c3b9693…

MALICIOUS

PDF

73.3 KB Created: 2021-03-14 00:15:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: eb9b9c0af9a72afee0c4740183aef308 SHA-1: 035f5ddf2e80dd0aa78407ddf50a3297d0f0841e SHA-256: c5f955ef2c3b9693a8ee3d9746a94fecb842fdcedb34b178a2f86f59c871a488
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to exploit users by directing them to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/wix?keyword=swords+and+souls+unblocked+66 PDF link annotation
    • http://idealica-it.website/arbeitszeugnis_schlussformel_ohne_dankltrq2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420756/normal_6044fe8b4058d.pdfIn PDF document text
    • http://jifarobajis.sportsontheweb.net/7730889895.pdfIn PDF document text
    • http://xutexukoxobofi.mywebcommunity.org/dikopekegosarupebuji.pdfIn PDF document text
    • http://bujufamamaw.22web.org/18880322705.pdfIn PDF document text
    • http://jewlgems.com/645143360137v4al.pdfIn PDF document text
    • http://foxilajat.sportsontheweb.net/zewotava.pdfIn PDF document text
    • http://polikarmonolit.ru/biosphere_information_article5doeo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474465/normal_5fe7a13be0fcc.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
    • http://xomapagovujux.atwebpages.com/twilight_portrait_movie_watch_online_free.pdfIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_c4e4a7141d09461791f6121fc69dd9e8.pdf?index=trueIn PDF document text
    • http://wuxininozikup.rf.gd/26350414152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4058002b-ce07-4295-8896-c5dde022a8fb/how_to_solve_a_3_by_3_rubiks_cube_easy_tutorial.pdfIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_56f6740dd39c4d38b8c4cb02a8da34b0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/610ee29d-77ef-4d2b-b1a2-b0c140cd4c12/rudanor.pdfIn PDF document text
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_a47a7d1af3684a3fad2efe4e83552dc7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/90772c38-4c69-46f3-b541-f631dbb24fa6/bimovonazimumiva.pdfIn PDF document text
    • http://vakewexapenox.epizy.com/bbc_weather_report_chennai_today_and_tomorrow.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_off0000d275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD275 5240 bytes
SHA-256: 8e16f550fdf5fd961d7a422fb4f18a1eeac3fcb2596c89c495a32616b3e13363
font_01_sfnt_off0000e451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE451 10980 bytes
SHA-256: e7919fd8075e015c0b97807b9d0cfb3ffa82c1facb65598569ee9e4d880050fc
font_02_sfnt_off000109fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FE 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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