Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4798e3f8a57b9a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 11:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e96813e339e4a53f5bb46cafd846e750 SHA-1: 05f61633a6b32e9d3c165eafdae11732fb5f14e2 SHA-256: 6b4798e3f8a57b9a1cf03056dd2d9de0ae369351dd3dda23288ba70855433f13
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect users to potentially harmful websites. The PDF structure and the presence of JavaScript suggest it's designed to exploit vulnerabilities or trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.alcera.ca/userfiles/file/46680195823.pdf In PDF document text
    • http://kcntanduc.vn/img_duhoc/files/gakamarunurij.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/64929424466.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/jexixixawevelow.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/kenoxalonokisugabakak.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/surejadagumapujon.pdfIn PDF document text
    • http://advertisingreports.info/assets/ckfinder/core/connector/php/uploads/files/52743454554.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/mexebokuwifurujatuze.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/4586152818.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/61481912378.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/kejedus.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b9cd1d599d50f70eb93704c3ecbf7e5f/lesexukaropuwubi.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/33029411209.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/44426434292.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/rurajuzobeguj.pdfIn PDF document text
    • http://apart1day.ru/file/78780176386.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109100938491414.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/jetosaxolabolidibenuv.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/70642339350.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34168013805.pdfIn PDF document text
    • http://jogagongu.pl/userfiles/file/59947790406.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/97346486627.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6b1b9775c---60844545129.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/pivesadamelavivulep.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///84548577513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=gta+5+by+htg+apkPDF 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_off0000dce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF500 10288 bytes
SHA-256: beb5b87bc11aa6831eddcbbf52deebc749c80ca39949af4c3439a7833caf0d44
font_02_sfnt_off00010c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2C 17960 bytes
SHA-256: bd82743388ded17cb4fa92f6a130b84ef97e34413b7ff9c2355a1ba71bdf78ab