Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac516d1a3b61f6d…

MALICIOUS

PDF

76.5 KB Created: 2021-02-08 20:13:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 047fa9c57bf4329b36def45b62794e48 SHA-1: f63c7718014b904296083a30392e643b03be0938 SHA-256: 4ac516d1a3b61f6dbdd39d95afc86a178543e8e7c9b6c14034dbf7a7ebc7c076
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, including a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/123?utm_term=candy+cane+lane+st+louis+times PDF link annotation
    • http://zoomita.fun/vovuwasobotawoteip8cz.pdfIn PDF document text
    • http://design-kvartira.info/lomukewenurulojecl3pw.pdfIn PDF document text
    • https://cdn.sqhk.co/raninogozo/aUchihg/kogasalutu.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/Htgfjiw/zakodegojogowotero.pdfIn PDF document text
    • http://newyearshop.site/vuxomapamujewizucgx0.pdfIn PDF document text
    • http://lazezubeb.22web.org/men_s_haircut_fade_guide.pdfIn PDF document text
    • http://1xbet-football.fun/winterhawks_suite_ticketsw99nk.pdfIn PDF document text
    • https://cdn.sqhk.co/ribovonubod/a3ihChc/taweriponibuvo.pdfIn PDF document text
    • http://50offshop.info/army_acft_field_manualg2xw3.pdfIn PDF document text
    • http://s7hmus.org/xuwekutalumaran2fihf.pdfIn PDF document text
    • http://lnstagram-helping-centre.com/optoma_hd141x_lamp_light_redvomap.pdfIn PDF document text
    • http://hesap-al-sat.com/bell_lets_talk_picture_framel4ctf.pdfIn PDF document text
    • http://ita-fitness.fun/auto_spare_parts_business_plan8gylk.pdfIn PDF document text
    • http://lisolu.org/guzoxojk9e02.pdfIn PDF document text
    • http://ins.expert/verejidejopubadipubbeqt.pdfIn PDF document text
    • https://cdn.sqhk.co/febenapox/qigCagg/76305025476.pdfIn PDF document text
    • http://nanolenka.xyz/163366020728mlbp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nadefivetokilak.rf.gd/japoz.pdfIn PDF document text
    • http://nototen.epizy.com/94112397342.pdfIn PDF document text
    • http://wimifus.rf.gd/crianza_de_lombriz_roja_californiana.pdfIn PDF document text
    • http://resibifamopoto.rf.gd/bitstream_font_navigator_2006.pdfIn PDF document text
    • http://mibexaluji.epizy.com/xadobekalajenukikamepape.pdfIn PDF document text
    • http://tejusadesivuti.epizy.com/mark_carpio_music.pdfIn PDF document text
    • http://jaziwovapotulit.epizy.com/timaxanarisijusod.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_off0000ee26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 4996 bytes
SHA-256: c3687a2aa812284d22f0787422646d398c0f13d9f2ff3173e6c8e44771aa8ff5
font_01_sfnt_off0000ff17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF17 11028 bytes
SHA-256: 6fd3b8f9bdb1f00acca72385582d38f8b35f0cfb94dba8d3aeb2cdebeba3c7a2

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