Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bac0f4117377685…

MALICIOUS

PDF

70.4 KB Created: 2021-09-15 23:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2a7f0b80eed0736af5e55f54876913e0 SHA-1: a0952be967903ee1d59d263a6c52c2628a6ca1b1 SHA-256: 4bac0f4117377685571684f89726bd848bbc1332c5998b211928f93d6d904646
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous unknown URLs suggest a phishing or link-farming campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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.letnifestiwal.pl/ckfinder/userfiles/files/kavuvamunivan.pdf In PDF document text
    • http://brenno-tojestto.pl/userfiles/file/rasez.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/96644048896.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/xefuv.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/11924358340.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/juvum.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/91270332386.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/leninakoxaxubaxufere.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/tetatimugifolakuvuzuzodi.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/49131450178.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/vogoxufufe.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/belulumon.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/weripebufuwev.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/21160440331.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/83237928149.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/virarofuxemev.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/33365289411.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/bolosagutovad.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/24939288949.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/savif.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/nawipezoxotudepuxijaxa.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kudutowari.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/91941993550.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/9051088506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=print+pdf+angularPDF 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_off0000b78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78F 10356 bytes
SHA-256: a5e3fdae0f4e4cfc34123a7711f07cfe3179b4c7c6924364f55d4a882d418505
font_01_sfnt_off0000cec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D7 14772 bytes
SHA-256: 31722386d04dafb577a3e652f6f917caf54a273c3c83c8c20bb3107c372099dd

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