Malicious PDF — malware analysis report

Static analysis result for SHA-256 3249833b2f64943f…

MALICIOUS

PDF

83.4 KB Created: 2021-10-05 01:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 226be3de0c530773ec5d2b5b4f0fc859 SHA-1: 731f89a2cdea7ed8d90ff0a00234615283077c33 SHA-256: 3249833b2f64943f00270395abb2b9b4fbc948d3ecbd59514d122a93eb55c73a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the large number of extracted URLs, many pointing to potentially disposable domains, indicate a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://ekoelprom.pl/public/images/editor/file/xebilataxafilural.pdf In PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210928_4F4C0B8654ED6C05.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/mevolibudejojidoze.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615117477e723---dulowez.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/paboxomugodotol.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/webifuzizuz.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/45105178524.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/zalawux.pdfIn PDF document text
    • https://jucariicopilasi.ro/app/webroot/files/userfiles/files/95360541572.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/58577955392.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/gitafuzuvogawadopagema.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/6343200895.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/76850471217.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1615b7b34ce418---vuzuvuxo.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/tijipeseguzezawiferu.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/sibosupima.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/28342133357.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/4588888578.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/notupixixasew.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/liriporuzipamuwuli.pdfIn PDF document text
    • https://kultmotor.hu/images/files/78692359691.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/denomitepamererukuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=components+health+care+delivery+systemPDF 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_off0000dce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE6 10988 bytes
SHA-256: e6bf6b781604c43fe1ca7920526608007288e220082a9dacc83812abe1197bab
font_01_sfnt_off0000f642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF642 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E54 18748 bytes
SHA-256: ff054cf1cf8dbbfa7526b3b341f09d5c9e3635d107746cfe0a72c4b1e6f88fa4

Open this report in the interactive analyzer, or submit your own file for analysis.