Malicious PDF — malware analysis report

Static analysis result for SHA-256 c649b2fb6518eaa9…

MALICIOUS

PDF

142.4 KB Created: 2021-02-14 15:21:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bff4af7d545ee16f8f531fa7de2dbc0f SHA-1: 6eae93252685be8169998a65d1fdf2e29bef2dc4 SHA-256: c649b2fb6518eaa9fb5ff27b97534a5a2552fa5c5233fca8e4e1c6920a5c66c2
134 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting domains, indicating a link farm designed to distribute malware. The presence of a 'ML_NYX_PDF_MALICIOUS' heuristic firing and ClamAV detection further supports its malicious nature. The document body, though heavily obfuscated, suggests a lure related to educational materials, specifically a 'preposition of time worksheet'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=preposition+of+time+worksheet+for+grade+7 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444117/normal_6022c5dd038e4.pdfIn PDF document text
    • http://votajudizim.22web.org/archero_mod_apk_gem.pdfIn PDF document text
    • http://lixamewura.iblogger.org/41177783259.pdfIn PDF document text
    • https://cdn.sqhk.co/lebudawojafi/rieiiBF/gekagogaditomoboletonalel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383924/normal_5fc6782fe8419.pdfIn PDF document text
    • https://cdn.sqhk.co/ferorigife/U2jb7ha/twilight_struggle_deluxe_edition_review.pdfIn PDF document text
    • https://cdn.sqhk.co/divojimo/hdjdnid/idle_factory_inc.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/nihsbgc/65230949386.pdfIn PDF document text
    • http://bluetea.space/karate_kid_song_never_say_neverwolna.pdfIn PDF document text
    • http://aazzzry.space/bayana_agreement_formatejr56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487386/normal_5fec064644fa3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vefazuxugog.rf.gd/bopirex.pdfIn PDF document text
    • http://nufisor.rf.gd/copy_sheet_trong_excel_sang_file_khac.pdfIn PDF document text
    • http://pizoxuwa.epizy.com/65054706934.pdfIn PDF document text
    • http://piwirapofo.epizy.com/robupakofe.pdfIn PDF document text
    • http://lujemibezigan.epizy.com/reviews_hitchhiker_s_guide_to_the_galaxy.pdfIn PDF document text
    • http://tesoxukezeziles.epizy.com/mozosevuxi.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/california_adventure_park_map_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/mejodipipejedarer.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_off0001e9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E9D9 5660 bytes
SHA-256: b57eee9ba0cd7e1955f67343b038c153e6166fcd189e3a8cc36182b5f5950f76
font_01_sfnt_off0001fd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FD0F 14200 bytes
SHA-256: c116dfba9319a027a1ebc55842f40bd1c575d18021d78dc8fa49275a56e4ba01

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