Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb73160fe6783436…

MALICIOUS

PDF

85.5 KB Created: 2021-09-16 21:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b2dcdee8a697bba79857cbfdf1cf1c06 SHA-1: acb41bc710d48da3adefde1c9244773b4378e25f SHA-256: bb73160fe6783436347bad418cc196e4616ec6fb67ff3a1b34ecb2977edc4257
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. It contains numerous embedded URLs, many of which point to external PDF files, suggesting a redirection or download mechanism. The presence of external URIs and the link farm heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://votejoedestefano.com/editorData/file/56294175669.pdf In PDF document text
    • http://liavanhaeringen.nl/userfiles/files/1629730998.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/97936434902.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/38049227973.pdfIn PDF document text
    • http://luyutea.net/v15/Upload/file/2021916643496720.pdfIn PDF document text
    • http://dnepropress.net/files/file/30852997036.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/wewepukonamaxokili.pdfIn PDF document text
    • https://thehouseproduction.net/file/14679317038.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/50937441797.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e73edf96d---81320065118.pdfIn PDF document text
    • https://sujatasfoodopolis.com/ckfinder/userfiles/files/luzapidizogiguluni.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/44121609214.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/64569086808.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/wapasovibadoruw.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/21771194440.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/sodilefuzonogufikum.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/4e2shehn9b2es547ns5n315usq/dibawefatevexomosija.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/50023771193.pdfIn PDF document text
    • http://houselandia.ru/files/14975670550.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/nabivagupujipovofuda.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/54083527314.pdfIn PDF document text
    • http://grafitym.kz/files/file/89183418398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=words+to+describe+someone+beginning+with+pPDF 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_off0000e7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B5 18384 bytes
SHA-256: 24e1cd272b0ef26321457d4ffc2d00c1d35da57f6471ddb51d1be421556f58c0
font_01_sfnt_off00011787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11787 10972 bytes
SHA-256: 7b67957930b0cd0fcf4e044ce86bc776afae15cb6850d80524e53722b4881dd3
font_02_sfnt_off0001306c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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