Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f7cb2efed8df75…

MALICIOUS

PDF

69.1 KB Created: 2021-09-23 15:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f214c4c2adf382c0e7685ef28ce33fd2 SHA-1: c3ff316fba57bb9f54a133132bc8fe9559e2564e SHA-256: d1f7cb2efed8df756c4893640846068b91bce8b11c3b8db2ccabb244938bd97b
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 facilitates the redirection to external URLs, as suggested by the PDF_URI heuristic, which are often used for phishing or downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://vinhomeshaiphong.net/app/webroot/img/files/lazolewesur.pdf In PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/lufuradibujokizufe.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/79908337877.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/52069479831.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/rijekiderixosogo.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/goviwina.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/gomutugixijujaba.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/48948044133.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/vosalajuronidufewemal.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/widasaduvapojowimukeral.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/sojekepisavafez.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/denatidopabokale.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/25830356758.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/fixaleziramomewu.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/cd4a9ac58b38aed6f47579d34754fb26/guzezabapuwo.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/234095855.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/18237818097.pdfIn PDF document text
    • http://wohingltd.com/userfiles/vusini.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/posesixubuwidajogati.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/daxusadoxesuvejobesekuko.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/juzogasof.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/zesikegotojunog.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210906212333.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d3dcd9d80---43288957720.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/rujamufivut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+improve+download+speed+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_off0000b26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26E 10696 bytes
SHA-256: 2f2442b80746fc52ca0c56b32d3211da28925d828ed5b3c42fb7142167e9ee68
font_01_sfnt_off0000caf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF3 14148 bytes
SHA-256: f9f8b08a2316335e0318e75d8f463a25912d49b963bd82dfbb316a104c351b3d
font_02_sfnt_off0000ee1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1