Malicious PDF — malware analysis report

Static analysis result for SHA-256 deff4fdf57403365…

MALICIOUS

PDF

70.7 KB Created: 2021-03-11 14:20:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fcda38cdba164e10c919b915b62a7346 SHA-1: a1349aea0afd13a5bca57f31507f5a4d4da2d3b6 SHA-256: deff4fdf57403365222cc2f038e1fcbb02a8e17c0fa8e90f424dd7320a5511a3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence heuristic identifying it as a link farm hosted on disposable infrastructure. The primary malicious URL, 'https://nipisod.ru/strik?utm_term=castle+clout+2+return+of+the+king', is directly referenced by a PDF_URI heuristic. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

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/strik?utm_term=castle+clout+2+return+of+the+king PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374177/normal_5ffdfb263b40b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492600/normal_6039d322aa340.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416322/normal_60219b3a3fa69.pdfIn PDF document text
    • http://kogiwonewaveg.iblogger.org/homepage_baukasten_kostenlos_deutsch.pdfIn PDF document text
    • http://peroruse.iblogger.org/79788694478.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450250/normal_6004b1d1c696d.pdfIn PDF document text
    • http://zexofezureza.iblogger.org/jumewurijenimasirapikaf.pdfIn PDF document text
    • http://foruzakitotilut.iblogger.org/fisiopatologia_doena_de_alzheimer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nuposim.rf.gd/visa_on_arrival_application_form_thailand.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/weber_spirit_e-210_2-burner_lp_gas_grill_black.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/frayer_model_fillable_template.pdfIn PDF document text
    • http://renirujetumofid.epizy.com/musorapofaju.pdfIn PDF document text
    • http://bufezesaj.epizy.com/vivitek_qumi_q6_pocket_projector.pdfIn PDF document text
    • http://zebofazedixa.rf.gd/math_10_module_2_teachers_guide.pdfIn PDF document text
    • http://katiwuvavesu.epizy.com/bumirotumozewupozubusa.pdfIn PDF document text
    • http://zagizub.rf.gd/73529652344.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/anaphylaxis_guidelines_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/human_factors_design_guide.pdfIn PDF document text
    • http://tovukazemav.epizy.com/star_spangled_banner_poem.pdfIn PDF document text
    • http://werexixudi.rf.gd/82760697886.pdfIn PDF document text
    • http://zunuwovadete.epizy.com/b.tech_mechanical_engg_jobs_in_chennai.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/man_the_unknown_free_download.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_off0000ca77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA77 5244 bytes
SHA-256: d9ed4969c76c955b54b522fb882f576eb72b90dc76e7cc533486cb4ae97738be
font_01_sfnt_off0000dc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC43 10448 bytes
SHA-256: 837bc4e02dfee825d99a3827a14a32e52089a07828e8649daaa62ed630972ca5
font_02_sfnt_off0000ff27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF27 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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