Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71658432a3dd87c…

MALICIOUS

PDF

78.1 KB Created: 2021-03-08 12:30:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 5f12b76f733a6691c94f0a709a7c5db8 SHA-1: 4b47fcfa2260094937d55aaa1d3ed8014a1a609a SHA-256: e71658432a3dd87c0e97cb01424db9338fc75cca2da451e422051a3f2364b620
126 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable domains, many of which are associated with link farms and UTM parameters, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://golowaki.ru/strik?utm_term=what+is+the+wps+button+on+the+canon+printer PDF link annotation
    • http://mixed-rootwork.com/552817054206r4us.pdfIn PDF document text
    • http://fuvilejolo.iblogger.org/katogujapijosux.pdfIn PDF document text
    • http://maddot.space/361530871214jq0v.pdfIn PDF document text
    • http://reactivaperu-2020.com/55568174624ldi5u.pdfIn PDF document text
    • http://it50life.pro/23554160144erugy.pdfIn PDF document text
    • http://fbcopyright-center.com/86076515836l0fkf.pdfIn PDF document text
    • http://hookup750.website/5g_nr_pdcch_beamformingopk24.pdfIn PDF document text
    • http://shop50off.info/fibiwanamavivereruzah8len.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/dish_network_package_deals_with_internetqqy61.pdfIn PDF document text
    • http://freshka.fun/263974600850obcf.pdfIn PDF document text
    • http://bobr.space/33350732350ilczw.pdfIn PDF document text
    • http://jinunagavep.iblogger.org/vegiduvoneganumo.pdfIn PDF document text
    • http://copyright-infringement.business/71440219944rxy9.pdfIn PDF document text
    • http://buyfastedcircle.xyz/61535091463mb9x.pdfIn PDF document text
    • http://cuzinfo.ru/soundcraft_ui24r_software_demo4ydq7.pdfIn PDF document text
    • http://maewallace.com/79915471555g6ukb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lovetijif/80020114553.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/sinusoidal_pulse_width_modulation.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/nixotaxatovo.pdfIn PDF document text
    • http://gidepajujida.rf.gd/elegant_comfort_sheet_set.pdfIn PDF document text
    • http://pamemoroza.epizy.com/bojulovivowipipunifemid.pdfIn PDF document text
    • http://guwivuvasexi.epizy.com/agilent_54624a_oscilloscope_manual.pdfIn PDF document text
    • http://fugedofa.epizy.com/fitila.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/android_tv_best_movie_apps.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_off0000f3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D1 5236 bytes
SHA-256: 6a47df9abab680420ab6e741e2bbb1be6c15b56f0336e741cd0ccf4b7dd270b6
font_01_sfnt_off000105ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AB 10736 bytes
SHA-256: 5a936515ff562222d2b36593d1634bda724eca429758a7044c1e6b0d700f0d98

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