Malicious PDF — malware analysis report

Static analysis result for SHA-256 c650a4153ed2d335…

MALICIOUS

PDF

85.2 KB Created: 2021-03-29 15:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c50145fe826ceef5ee0d7c9af1c4a787 SHA-1: c0f8e39a837039498237ed13e2f9a4215180cd31 SHA-256: c650a4153ed2d335866e8820351d68632887048496633244733a7a6e5355121a
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, with one prominent URL pointing to a domain associated with malicious activity. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links on disposable hosting, further supporting a malicious intent to redirect users to potentially harmful sites.

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://dafemum.ru/strik?utm_term=mtd+42+inch+snow+blower+attachment+parts
    • https://bibonuben.weebly.com/uploads/1/3/4/5/134576194/dipoz_nuluzokimid.pdf
    • https://cdn.sqhk.co/lefuwaregew/Ugf4Drq/ages_and_stages_se_questionnaire.pdf
    • https://cdn.sqhk.co/xevowuto/Sjchiib/34591727075.pdf
    • http://becloud.website/information_technology_jobs_nyc_entry_levell0izi.pdf
    • http://dalnoboyi.xyz/asistente_de_googlel2jbl.pdf
    • https://static.s123-cdn-static.com/uploads/4409239/normal_5fddb988ac08c.pdf
    • https://nipawivas.weebly.com/uploads/1/3/2/6/132680981/1d7ed0249d7.pdf
    • https://cdn-cms.f-static.net/uploads/4414866/normal_5fe9d504296f1.pdf
    • http://newsportstechnology.ru/kontakion_of_the_dead_sheet_music3ilx1.pdf
    • https://cdn.sqhk.co/zogowefu/Rjahijf/tawegirativejupi.pdf
    • https://cdn-cms.f-static.net/uploads/4369773/normal_5fd9e66ba1ead.pdf
    • https://static.s123-cdn-static.com/uploads/4403140/normal_6009056853a42.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_8e2c4cf10e7b4ffd8d0a29865c9ad805.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3f4a8ff6-2792-47a5-91e1-40c6796df147/webununetiduginezab.pdf
    • https://uploads.strikinglycdn.com/files/dca935f0-e6c8-46ac-9425-c6ce52f2b411/musica_cristiana_acordes_de_piano.pdf
    • https://469ee322-798e-4c1d-9571-af6764901f97.filesusr.com/ugd/57169b_93518fceaa6a4455b710a05be6d4a97a.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100b3.bin
eb21245b621f98e7682c1d6b03fc30e0f6fbca4b8c954288edb8881cf9ad038a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100B3 5556 bytes
font_01_sfnt_off0001137a.bin
735ba4f2b863798f9c83355fdc8ac45ed25ca1e263d22b97b4c23789e07c5610		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1137A 11240 bytes
font_02_sfnt_off000139aa.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139AA 4324 bytes

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