Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18a662d789433b4…

MALICIOUS

PDF

94.3 KB Created: 2021-09-13 14:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aca69bef2b24107eb469200ffab03154 SHA-1: 772e98af72f034683699e85b0ef6d6c58d7d788d SHA-256: f18a662d789433b489908ac01fe6cdd4683c6c768d06b70df61de4d4885204d2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs found in the document, which are often used for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://silatur.com/js/ckfinder/userfiles/files/63381336819.pdf In PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/zotokikozaxubasafeno.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/42536489923.pdfIn PDF document text
    • http://ausafe.net/images/art/files/68544877284.pdfIn PDF document text
    • https://cooperspick.com/files/tosipezujufamiz.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/xerelu.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/90195363737.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/k6fjr2f6sm0dcbt5ntbflvdakg/bubezapeseregupuxaw.pdfIn PDF document text
    • http://polletnv.be/uploads/files/334114942.pdfIn PDF document text
    • http://manu-transport.com/documents/file/rawur.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76547217595.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/27082800306.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/12256216607.pdfIn PDF document text
    • https://huanghecables.com/d/files/60074607751.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/betezilano.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/17432342744.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///46356445766.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0c14934d9---33796906632.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/15895897460.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86884078602.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/zojanemosimubo.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/kevufone.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/rudemilusemudenoragiv.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/fexisuzemumuxor.pdfIn PDF document text
    • https://bachson.net/upload/file/jepokuroz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=spoofer+for+iosPDF 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://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_off000110a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000128b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B3 18852 bytes
SHA-256: bae6d285ab7f30f1f4181e1b72bd9885c699ac4c86fddbd53c4719a7e8e5dd61
font_02_sfnt_off00015982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15982 10016 bytes
SHA-256: e3db9fad29e2e645ad26f84d5f1d3c3e4d3a9c5e1a47545b447eadad9a294981

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