Malicious PDF — malware analysis report

Static analysis result for SHA-256 db88e79dc631a896…

MALICIOUS

PDF

85.6 KB Created: 2021-09-18 18:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d83789e5eaaf197dd043f73d6a2197d9 SHA-1: 4a7874ead7dc53965e75024db906dde2580803ef SHA-256: db88e79dc631a896b52fcb6f5cb3c6bb020050dd62e287be2604a2b09adeedf5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to link farms, and is flagged by ML classifiers and ClamAV as malicious. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to obscure the final destination through multiple redirects. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://kelvista.lt/images/files/jowufedojojubudavunezomik.pdf In PDF document text
    • https://strings97.hu/userfiles/file/tepevunanepozufijiz.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/7111742374.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/bidoz.pdfIn PDF document text
    • https://best-label.com/upload/files/kavupukaninenef.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/giwofajutasaxafaganujaz.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/18599972256.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/wopax.pdfIn PDF document text
    • https://preciseenergygroup.com/media/20873053689.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c5eb14e1---14405608415.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/wetimil.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/gadikolaj.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/kakoperalukuzevogixed.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/94968700821.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/pagomupisepuzemuve.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/xifigawosa.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/96095083855.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/56308491747.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/61958786183.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/zuloxap.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/zopoweri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=sex+game+free+for+androidPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/90155425220.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_off0000ec86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC86 10564 bytes
SHA-256: 7d8178447274622eb5edc2288ed9ea16f5c10a560af5c04a3d6b7071e1d19851
font_01_sfnt_off00010461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10461 17172 bytes
SHA-256: cfc31918bd4d1dc35aabb3055a29d53225cb775b2827296d8a74c58d5bcb5fdd
font_02_sfnt_off000130be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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