Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d171ca4df98d4bb…

MALICIOUS

PDF

69.2 KB Created: 2021-09-16 07:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 93c2c19be7e865fa8c62dbf5f5b75317 SHA-1: ab31599ca0c9797beb08362303f8b1e8eea31d3f SHA-256: 9d171ca4df98d4bbb41924247c36c9d85219521d370ffb01fe8cfbc4f583a069
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of external URIs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=galaga+download+for+android PDF link annotation
    • http://mastervgtour.by/var/upload/file/ruromimefosupe.pdfIn PDF document text
    • http://elitacasa.it/images/file/37597087392.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/katewumemotadaguxemijab.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/63060956975.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/46746015624.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/33916152000.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/65971467780.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/novumagumupumujesikudu.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/1482095702.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/57015516921.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ee6d03125---33819228568.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/47874848981.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210904192600.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/dunanigemowamebot.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/96982013445.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/jemaporumevupepetirewef.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/fosexenigikebegirajak.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/govafolomuruwaw.pdfIn PDF document text
    • http://sbcnepal.com/images/file/34785818775.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/wowutetumorexajukolidus.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/bozijolavabanoxokugujozex.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/55005409347.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/39476614281.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/8483453320.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/wasajabamoxumumadopiko.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB364 14568 bytes
SHA-256: 588a01cd0288db0c34d46b7642487c49a9f78786d921db3f7a7b2ee405b2fb59
font_01_sfnt_off0000d79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB4 10256 bytes
SHA-256: 82434cf2652e3d34107ff11a83ef422acf3b79dd21c05d0177a90bd03ed564be

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