Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8a48f7e865b62c…

MALICIOUS

PDF

69.7 KB Created: 2021-09-28 08:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c868848861addb5a347cfd13b9b30ab SHA-1: 4124552201a47c317e3615f9d14a4b2f3f184b0f SHA-256: bd8a48f7e865b62ce8c744987732b04749c0d48a47cb25e6c70f28acf8663d66
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://textingrights.com/userfiles/files/gesobokukagegizer.pdf In PDF document text
    • http://kiddeefire.com/media/userfiles/files/rusiwafov.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/33204203904.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/25513222397.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/wunaponovenufilunuxuk.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/24637418671.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/jilovozobu.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/satuzig.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/84449612665.pdfIn PDF document text
    • http://nanopena.cz/upload/file/misegimiso.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/duxopakaparojoripozizisot.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/34037421288.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134caa8ea0ff---julevoru.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/17980267356.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/36593626534.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/38866155079.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/80915502292.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/gukuxufomelini.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/zixeziwe.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/16379806746.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/lerirusozitujiponidakedi.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/kirenenodezukaviso.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-04-13-07-42-50.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/77114792998.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/14025106937.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/fopive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=evolution+of+android+versionsPDF link annotation
    • 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_off0000b065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB065 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87C 10496 bytes
SHA-256: 10a8a0c40c634874e846544a7e2fa2d3115a2189b71b0b92bfa871d4eebbf431
font_02_sfnt_off0000e075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE075 15572 bytes
SHA-256: 2d753b4005866d9103c574a564fe3e75e131ae25acf663759cb1eb08db24a62f

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