Malicious PDF — malware analysis report

Static analysis result for SHA-256 f47a1753365e3b9e…

MALICIOUS

PDF

68.9 KB Created: 2021-09-28 17:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0ac4bf979f9cf4ca8162a10628719c78 SHA-1: 1086579113002208fe85ec49f4170b7194bf8e2a SHA-256: f47a1753365e3b9e15cc7e7f5a981c70eb65eba542d4b2384de4542ef9fe5bef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many pointing to disposable hosting, which is a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload. No scripts were extracted, but the PDF structure and URL patterns suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://castel.lu/userfiles/files/nutotozuderine.pdf In PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/83377290435.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/38569600469.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613480c61dcf7---89518030872.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/garuruwemupefopovek.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/67415709825.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/70269058027.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/91229829347.pdfIn PDF document text
    • https://zzhqhi.com/d/files/40773377938.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/wujajapaxex.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/63373443680.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/11652266529.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/duwozafawiruduxa.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/79014088938.pdfIn PDF document text
    • http://elskenecologie.nl/files/66352894143.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/tizuduk.pdfIn PDF document text
    • https://xtremefitksa.xbodyksa.com/ckfinder/userfiles/files/34543196783.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/wuriberujofexumiruvusumu.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/mutidevowad.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/63308859806.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/59844894782.pdfIn PDF document text
    • http://air-ned.com/uploads/files/22250873977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=wigle+wifi+wardrivingPDF 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_off0000adc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D7 10288 bytes
SHA-256: 2b83eaa6156c567482d47a4f32fe2f1bc387ade34abaea1b2c14def4d316d64e
font_02_sfnt_off0000dcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDD 16540 bytes
SHA-256: aeba12aa929f0a82f96e420e3f990fe15b8a01c4419ad1d51b10fad27e6ee871

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