Malicious PDF — malware analysis report

Static analysis result for SHA-256 a700183ac7d983ac…

MALICIOUS

PDF

192.4 KB Created: 2021-03-22 23:34:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6d7cf205eac4ddccbcb8157ec67e4e15 SHA-1: c4e19fc01b1d1501b6b6c85fe65db86ae9c4b5b0 SHA-256: a700183ac7d983ace763c89a0e801e0bb68685624ef41dec714a8ce1fb030e92
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://nipisod.ru/123?utm_term=causative+passive+form+japanese PDF link annotation
    • http://xelipev.22web.org/tekokumarowewudewefofova.pdfIn PDF document text
    • http://rent-nout.site/4650620743l7hvt.pdfIn PDF document text
    • https://cdn.sqhk.co/jijatidos/hcggtjg/download_game_kill_shot_virus_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/gfrmIoq/60796325478.pdfIn PDF document text
    • http://bagesopabiwub.scienceontheweb.net/9978306491.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/luruze.pdfIn PDF document text
    • https://cdn.sqhk.co/busosuwik/je5gdP2/fojumisafepefen.pdfIn PDF document text
    • https://cdn.sqhk.co/jofomopunaw/ZKWMD79/codespark_academy_at_home_kids_coding.pdfIn PDF document text
    • http://hotloveme.online/546379524137m01p.pdfIn PDF document text
    • http://rumigiwataj.getenjoyment.net/morning_and_evening_adhkar_transliteration.pdfIn PDF document text
    • https://cdn.sqhk.co/wamedexipun/dgh0kYe/toolwiz_photos_pro_editor_app_download.pdfIn PDF document text
    • http://mavito.online/homeready_framework_homeownership_quiz_answers6uxyc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://konugatevokaxot.epizy.com/commonly_confused_words_worksheets_high_school.pdfIn PDF document text
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_07a4482a26c64b199395c864f5bd68a9.pdf?index=trueIn PDF document text
    • http://tupanukaxigazit.epizy.com/218268153.pdfIn PDF document text
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_603972efe19a4368868e50c7bda191b8.pdf?index=trueIn PDF document text
    • http://nemevefer.rf.gd/83820633696.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_off0001a658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A658 93396 bytes
SHA-256: e4102da0509f017660f9126d3a4981f8e85cd40a86aebbb2524a9f2026af5d90
font_01_sfnt_off0002bbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BBD3 5056 bytes
SHA-256: 31945c1c5019cfb8ef248e2144943e782df7c42528391a93f05075855280cf65
font_02_sfnt_off0002ccf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CCF7 11144 bytes
SHA-256: 4339a285ec5b45c80f92e46971230ebdf05f7cb8b3348e234221ac738e07d310

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