Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a583ab753219f3…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 21:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 404a2f2540422cc3da4fa73f79c983a4 SHA-1: 9ee40e757bb953b1ad81f39c0b38adb792f9dfff SHA-256: 93a583ab753219f368751d6bb9ba9a55400adcdf61c79450bfc997956df29e22
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, one of which is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/soxelewukinu.pdf In PDF document text
    • http://noithatsah.com/webroot/img/files/31367641140.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/26750286266.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/gujelolesexotugudefovuz.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/2126580823.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/52644379706.pdfIn PDF document text
    • http://phfamilyrestaurant.com/uploads/files/mizetagenazopod.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/muxezarulorunorofomoni.pdfIn PDF document text
    • https://tsolisp.com/files/file/kujumakof.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210906_165656.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/towipowatowig.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/gibaweledomaxetuko.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9028c831f---7330577664.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/norigikikasovuperej.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/karof.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/wasifajenopik.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/wororozeliruvelosolixe.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/64036023297.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/zobilasexo.pdfIn PDF document text
    • http://fourfoods.com/images/files/96269668093.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca87d48f0b---pomageju.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/92633425930.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/wexogugunadefupisaliteno.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/bivonebela.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/93537139982.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+change+the+look+of+messages+on+androidPDF 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_off0000df73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF73 17892 bytes
SHA-256: 38462923cb929bceeee97f206113024a98d7d6cf5649a521abf628187bf95a0a
font_01_sfnt_off00010d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12564 11092 bytes
SHA-256: 3a6aa345682c60fad5f619256bc9c5450a9139ce3683798f01c3115e55cfd5dd