Malicious PDF — malware analysis report

Static analysis result for SHA-256 24221c31fcb2f600…

MALICIOUS

PDF

74.8 KB Created: 2021-09-08 23:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4e0562cf1174ef4786c0aef1f9ea4afa SHA-1: 55816cb25704a7f649abd5d7bb34abb078355c88 SHA-256: 24221c31fcb2f600258f5525105e39ed320e150a30520ff5805b288c606f68bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on potentially disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely leveraging T1566.001 (Spearphishing Attachment) as the initial access vector.

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 http://champaigncursillo.com/userfiles/file/gexunabifolinezuzam.pdf In PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/927088026.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/vixunagapejexifeka.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161340e577d4e9---rosokijekozo.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/pamabofapowavewe.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/37525151191.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1630647515.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/xokuxubozoxivodexifi.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/zavosebu.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090723470673499.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/xowimoreti.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/fopewa.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/hf7ege53rcgdc2pc76dg8t3t6n/5574198460.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210908_76617CAAF1DE7F41.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/tubizumezaxuposexuji.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/5234127971.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/xapofonijapavanebo.pdfIn PDF document text
    • http://ossokahve.com/upload/file/luwazimanozulupi.pdfIn PDF document text
    • https://bauarch.bg/files/62269700423.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109041147151191.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090422002673499.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/dosederowomebufazobade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=avengers+infinity+war+full+movie+freePDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/tesalemonavimosupid.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_off0000bf0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD721 17316 bytes
SHA-256: f1ef7cd964d93406e8ea3968b581dc79aae88668c33ee36a21d9214935826af0
font_02_sfnt_off000103fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FC 10904 bytes
SHA-256: cd6e6b7460ef72a039cdb2ee27daa50eaa9a0802b38a4a8debfb4a66ac9e7950