Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9dd77429e32a91b…

MALICIOUS

PDF

72.9 KB Created: 2021-09-28 03:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: edaa20ab4d0b9f2455eb677e880826af SHA-1: 5493e4cfb02af52adc9ac664360fb71d14535119 SHA-256: d9dd77429e32a91b352fd3bc12672ae240fd8592e073c2dc3405e30e4e7abaa7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to phishing sites or download further malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggests a deliberate attempt to obscure the true destination through a large number of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://o-dance.com/upload/files/bafugebige.pdf In PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/37688986833.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/61613554319.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/wedelob.pdfIn PDF document text
    • http://all-premium.com/user_file/files/28426084152.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/39239622669.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/14429322999.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/93900182168.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346d2773ff4---8297733447.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/xajevewajixojokaxisazul.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210917173212.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72258441085.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/ninurifomotod.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/47691930434.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/19697539006.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/63353784099.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/lepabawirewideximumivam.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161491401813fb---43621242323.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/20207505336.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/bedumozufejegog.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/32295597721.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/wafizejusowo.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/lorufujekinosonezoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=big+nate+pdf+downloadPDF 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_off0000b46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46A 19348 bytes
SHA-256: 4afdf3a61ff5da917232d225b0a94ae46e0f8fabbba311c965a5f72e462401bc
font_01_sfnt_off0000e60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE22 10544 bytes
SHA-256: 6d09db62832cae008d4308431977838b97b4f3cace8b31c46b944d2d99016f32