Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e68392ac10b5a9…

MALICIOUS

PDF

73.4 KB Created: 2021-03-09 10:19:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 51845b824ec63e74ac0f713fcab7e1de SHA-1: f9feb362b40db682786dcf90b399af2ccb6f2f10 SHA-256: b3e68392ac10b5a9b4389884b2c1958c6dea92f245d80534faba273a2612008d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms and phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xezojetit.ru/wix?keyword=student+2020+g%25C3%25B6teborg PDF link annotation
    • http://winoxolupuvil.getenjoyment.net/wixebesine.pdfIn PDF document text
    • https://guverududilo.weebly.com/uploads/1/3/6/0/136086053/liwumulejavas-momikodiki-zinuzexuxuwuwel.pdfIn PDF document text
    • https://dejegudiferu.weebly.com/uploads/1/3/1/8/131857494/kolemede.pdfIn PDF document text
    • http://nosixavol.sportsontheweb.net/1513575014.pdfIn PDF document text
    • http://lozejebivo.scienceontheweb.net/literature_circle_activities_high_school.pdfIn PDF document text
    • http://nelunufibedu.iblogger.org/vetoluramize.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bc5ba30c-e427-49eb-abc4-9677f18f04c1.filesusr.com/ugd/bcd086_565d17c66e2c4f7096b97a9694ff0b6f.pdf?index=trueIn PDF document text
    • https://504706c9-3a86-45eb-876a-6494ef133fff.filesusr.com/ugd/80c1db_55a2b87339714b239a1436368a34d3c0.pdf?index=trueIn PDF document text
    • https://2a009ac4-5770-49f2-ae16-4ce107243443.filesusr.com/ugd/59deca_fe77af7c28f1484197895343036b83e4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/578355623.pdfIn PDF document text
    • http://mivuturirem.rf.gd/how_do_you_cook_pork_chops_and_rice_in_a_pressure_cooker.pdfIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_673bede8c00243fbaef225d02afd7c32.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/models_of_disease_causation_in_epidemiology.pdfIn PDF document text
    • http://ruwiluleter.epizy.com/korapepik.pdfIn PDF document text
    • http://nopawalaxuwaw.onlinewebshop.net/54586410057.pdfIn PDF document text
    • http://gomugugagaf.onlinewebshop.net/rugebumevirugovix.pdfIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_13b3bb49aef84a4aa5820ee89308d0fd.pdf?index=trueIn PDF document text
    • http://pevurevakube.rf.gd/52003657790.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/vag_com_vcds_18._9.pdfIn PDF document text
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_67d5a671c29349dca1baff43942eead9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kavalukato/79257758365.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/pathfinder_kingmaker_wizard_guide.pdfIn PDF document text
    • http://rijogutigoxek.epizy.com/53370375881.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_off0000e1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DC 5228 bytes
SHA-256: 6ea215d2834e3ee48630f2688c25457a6100f28846a4d0863ef5cca6466c22e5
font_01_sfnt_off0000f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 10276 bytes
SHA-256: 8160fcd8f4108b322dc3f4443de678720c447e4dfd5422e4fa9399635dff6fea

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