Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8949b46416556c…

MALICIOUS

PDF

79.4 KB Created: 2021-03-27 17:43:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1d6006ff80858ee88c81d80ef289b765 SHA-1: d9aa61a142dc8840a610b1493999e898ee5bd051 SHA-256: ef8949b46416556cc7ecd317f94ccb6d935047e624d7d741d95f9c75d1c7cee7
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as an external URI leading to a suspicious domain. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://druttle.ru/strik?utm_term=keeping+you+a+secret+pdf+download PDF link annotation
    • https://gibodogud.weebly.com/uploads/1/3/5/9/135994226/93aee484f8ab75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393637/normal_5fd8af88de848.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497697/normal_5fcc049c99d02.pdfIn PDF document text
    • https://gojafone.weebly.com/uploads/1/3/4/8/134891791/pepuronevejuva-gibidejumowig-razulonodu.pdfIn PDF document text
    • https://gokodasev.weebly.com/uploads/1/3/5/3/135339924/6630288.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373778/normal_6035ad1d27a8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388041/normal_600946271176d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417413/normal_6027f6d9cedb8.pdfIn PDF document text
    • http://vabapagamowese.22web.org/bhairava_dweepam_movie_free.pdfIn PDF document text
    • http://fagawozuwa.22web.org/bienestar_social.pdfIn PDF document text
    • https://waperimawomexav.weebly.com/uploads/1/3/4/7/134733778/kovufirizeguve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422377/normal_605c29d1c3972.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485166/normal_603638e76e89f.pdfIn PDF document text
    • https://xinorexuvon.weebly.com/uploads/1/3/4/6/134608307/4714404.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wifudozakiteg.epizy.com/company_law_practice_manual_ipcc.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/palayathu_amman_tamil_movie_full.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/nice_guidelines_heart_failure_bnp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00519513-ef8f-4267-929f-bfc68dea153c/81575755070.pdfIn PDF document text
    • http://kasanuvuwa.epizy.com/97178703159.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/478c4121-ebaa-4df0-b56b-801dfbc20851/three_view_orthographic_drawing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8938dd38-2c4f-455f-9507-09e133ff61d5/jovenimema.pdfIn PDF document text
    • http://fotopokidag.epizy.com/waiting_for_godot_themes_motifs_and_symbols.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/where_was_the_last_song_filmed_at.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f52c1665-fc1d-4549-81b6-976ccecbbf54/gatokiba.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/bang_bang_all_video_song_pagalworld._com.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f18842cd-3867-4128-896d-cdbd72477a0e/57041588963.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE016 5484 bytes
SHA-256: 4f83d0b010796f154574cacef0c6e0c9e2a487049d97535d5191d1439f2fab78
font_01_sfnt_off0000f2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F3 10832 bytes
SHA-256: 045475e2dceadc5d32279cac4c178d10ba994f15a82fc12d40c5f687369d81c8
font_02_sfnt_off00011812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11812 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e