Malicious PDF — malware analysis report

Static analysis result for SHA-256 599e79c081343d4f…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 06:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ce3c210887f60b3982c1c956ac6affcc SHA-1: f9f242b56166f9e39a6e77048331d080ccce7f5d SHA-256: 599e79c081343d4f7ee8d07732a94353681888b4cb4fcfdd7aa3c471170bd469
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 by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious intent through a large number of low-reputation links. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sluganarodu.org/userfiles/files/63738782672.pdf In PDF document text
    • https://izr.fr/files/69550611008.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/20/file/30785659799.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/zifubebij.pdfIn PDF document text
    • http://deauville.ru/files/file/xedilurebidatefifejozo.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/mirakojuxilinated.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613aae6675211---93335451324.pdfIn PDF document text
    • http://www.polni.si/Images/files/55531516336.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/mided.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/dumupewomibewenofakedazib.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/xorawarulixosul.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16147f53364425---zojaz.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/zutakikiwopazilosa.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/pigavozumadati.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/79870711422.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/luxakigezaranak.pdfIn PDF document text
    • https://kimcert.org/E/file/xovufemadugaduwitajovaru.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/gunevekipojevaxef.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/laxotan.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/kuditosupurawatabasux.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/fomilibonotowubujur.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/kinifeg.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/fokapegamakid.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/86058076896.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/temadelaruxer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+make+purple+with+colorsPDF 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_off0000e26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7F 17712 bytes
SHA-256: 577c3dc42bdfe47445564c312db2adc0bd98e18f7349bb4cf30b2689cbec94a9
font_02_sfnt_off000127ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CA 10804 bytes
SHA-256: 65a0e060a3ab9e989c8db6b1d0a76025915aa0f55f66efeaad9877abd6db0c1b

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