Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc5ae4608482f7a…

MALICIOUS

PDF

77.8 KB Created: 2021-09-15 20:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ca0fb272b1a79abd71d079c23449a706 SHA-1: 8bef98db0e8ce8950461510f167cce8ba07a5fb7 SHA-256: 1cc5ae4608482f7ae404bc397201d4cbfcbfbce452bc57fcca5354a845cf83a3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF_JS heuristic indicates the presence of embedded JavaScript, which is often used to execute malicious actions. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely redirects to external URLs, as evidenced by the numerous PDF_URI and EMBEDDED_URL findings, potentially leading to phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://placidlakes.com/larpm/uploads/file/vizanaliregafur.pdf In PDF document text
    • http://pactolous.hu/upload/file/8828708275.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/wifilidijataxowasibuwemuz.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/tetapuragan.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/7349031657.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/22703511295.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/zutopamibatejuvotifufo.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/46357986935.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/naremopulilipulub.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210902_ABD9AB3E756CCE1E.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/59237141363.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/30671587340.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/95924058577.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021091201130873499.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/f2942010f24a976c73df1e62275afebf/vadelefixipo.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/5481571213.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/gipigulewokonid.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/bupenonexidotipa.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/solezidoruwusokuwu.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/ranuwalokenarajomikub.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/29f84a6e547c7d9108d8da3860ed11c4/vamifeb.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/relivatovi.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/66011336634.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/16805897296.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/lufaxewopojetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=head+football+frivPDF 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_off0000cc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC79 10272 bytes
SHA-256: 53ea56bc824a6d49469a8501ceef9b191985aae9c4064fddbe8532deecfebbba
font_01_sfnt_off0000e3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB3 17928 bytes
SHA-256: e2e0890baa24ed4a404f863f07c37450fc4a2599df6a8ec3c6c779d7b0c65257