Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02ce5ce7c3ea4ef…

MALICIOUS

PDF

80.3 KB Created: 2021-09-12 04:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a97fd7449e407490379ce4b94b94c8dc SHA-1: f2243ca5101665b7e745012e999177148914064c SHA-256: a02ce5ce7c3ea4ef26f3e2fc8a2de057a03e55ced9f950494981d4c4517e9614
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The document body is heavily obfuscated and unreadable, but the presence of multiple external links suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16110469670.pdf In PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/pexukato.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/7461lgdg1b0c0ks7c0vcto0u20/66211323341.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/1512891832.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/bajojavenovebaj.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210901_4A8BE2845100C716.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/lopawumetom.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/25254181500.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/fufazejelajunasewuz.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/96201055005.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/balozunevudokavipodeviv.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/55336051954.pdfIn PDF document text
    • https://parc-hotel.info/file/92473541743.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/84307510957.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/30470516498.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/23508222191.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/xibesumibatebuvuzerowad.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/18158919430.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/68725061426.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/76168265556.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/demano.pdfIn PDF document text
    • http://chenruichem.com/upload/files/14400631487.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16132e48aaf836---80228330442.pdfIn PDF document text
    • http://slr-eyewear.com/slr/userfiles/20210905001944.pdfIn PDF document text
    • http://www.moyekolodin.com/files/65619407583.pdfIn PDF document text
    • https://tessuno.com/upload/files/613caef6cc5a0.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=shl+verbal+test+answers+pdfPDF 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_off0000d5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FA 10748 bytes
SHA-256: ee23cb4a425967f1f5923f51a887d4e546498fad6c56f2ea69774eaac79caafe
font_01_sfnt_off0000ee83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10695 17632 bytes
SHA-256: bc4bfbd4368146b8a6a3183185121e1c27b1f4e8fe832e575222b0be29f94822