Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde789f54c2ea4db…

MALICIOUS

PDF

84.7 KB Created: 2021-09-21 01:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2cfac1cb08a2f03686416015cb94d285 SHA-1: a5e110309cb5a19a06f6465804963c36e8f2f0e5 SHA-256: dde789f54c2ea4db7c1affdd43f443ba0049754f69ffdbcc4be8ecdc12969163
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to potentially malicious domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • 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.
  • 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://thegioimercedes.com/upload/files/4003933124.pdf In PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/72300313015.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/mageno.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/91046967726.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/fiburutejin.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/99079028631.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/22753583718.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/8621164571.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16138d74460d08---jipititijororeboxegexabux.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109120638041992.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/3351825744.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/79113658129.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/nazukudas.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/40242843903.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/1037095944613b1b334cbb2.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/21872914910.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/62870518724.pdfIn PDF document text
    • https://ratodua.com/contents/files/bapedi.pdfIn PDF document text
    • http://scantech3d.com/files/sobovazuwibipivig.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/moxexusoz.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16135b117e54d2---70511257319.pdfIn PDF document text
    • https://schmitz.cz/res/file/77531696098.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=best+app+mods+for+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_off0000e8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F4 17180 bytes
SHA-256: 30785a2c2c0829c74e5ba5f5b24a1c22b3b311caf7e605ba552f3b17881ad22d
font_02_sfnt_off00012d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D46 10664 bytes
SHA-256: d303034fd6e62ef4af44ff5c00a6e402a71986b45590437e3ddd606b05059b42