Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae3ea90a2c750f46…

MALICIOUS

PDF

85.3 KB Created: 2021-09-18 17:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 82baae7da63311c99ba5bd2eb1f2cb41 SHA-1: 06a439cb266c0ba4a26767febe63caadf67c6095 SHA-256: ae3ea90a2c750f46c45fc5163da8e71108d2d61f9e336a1a56538a1794bc4f34
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to suspicious domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent, likely to facilitate the download of a secondary payload. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a phishing and trojan delivery scenario.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://urparitet.ru/admin/ckfinder/userfiles/files/93361214235.pdf In PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/92806601460.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/5227596773.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/93081464991.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/giravidigalutujefolubi.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/pekawagalid.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a76777ec9---pozixaxanevovaragudunaxit.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/zobupap.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/wesuvekebukabulek.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/mopitigop.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/xamazedukedogajejinatam.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/xubekirifizuvagijebod.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/dinisuxabakelidozobumoguj.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/nanejedogowegam.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/24358800153.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/sisolebufow.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/funavisatogulujuzum.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16131c2aac55f4---35837445052.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd81fd7c92---36166844.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/jefepiremukurikefewikof.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/faged.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/97168392500.pdfIn PDF document text
    • http://kahasat.cz/data/file/koronifewukesomudatal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=download+memuplay+for+windows+10+32+bitPDF 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_off0000e679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE679 11568 bytes
SHA-256: d0d9cf5876a89fc45977997d85fc139a2dea160d5a5a6775eb7033142ad86115
font_01_sfnt_off000101d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E5 17752 bytes
SHA-256: 4a98bd97739d51f3cae71871d243363276bbf08fc099333e0259a92ebc708b6b