Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0edb4ba41ad6f8b…

MALICIOUS

PDF

73.4 KB Created: 2021-09-10 21:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5e94663be93852c584f08f985a2dbb55 SHA-1: 8fe42a8dbbe921f2667b3bc722a94034d1bb5c00 SHA-256: e0edb4ba41ad6f8b524ec17cd2c3169e6d3046466d8c62be63f5e76f13c41bb4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The document body is heavily obfuscated, but the presence of numerous embedded URLs pointing to potentially malicious domains suggests an attempt to redirect users to harmful content. The file's structure and the nature of the URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://gencshow.com/upload/ckfinder/files/zutevoxasizefagisinopebo.pdf In PDF document text
    • http://myshiou.com/uploads/files/202109091149457659.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/16582539250.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/7935143197.pdfIn PDF document text
    • https://songiadahoaian.com/upload/ck/files/28082404795.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/bijerijijabuvi.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/fakefotatiwulimexajasiv.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/xezubezulova.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/89120684286.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/60338908429.pdfIn PDF document text
    • http://packamate.com/userfiles/41191395688.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/damepovobagebava.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/41797609935.pdfIn PDF document text
    • https://pellevah.com/upload/files/6085850143.pdfIn PDF document text
    • https://emenu.hu/editor_up/xiwid.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/modafodugivu.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec10abf9fc---xajegotajivifimivu.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/linomamidikatufo.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/lefososimosaduxukupizomob.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139540d4d5e8---52413892536.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/6398582489.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/tulizep.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/texixubosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=android+development+themesPDF 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_off0000bea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA0 15996 bytes
SHA-256: 817b66d0a62c0af5b146b0f132dceab3c3b30a17e60730d2d3071891f19dfbf2
font_01_sfnt_off0000e7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10010 10544 bytes
SHA-256: a3a2ea494914ac4b3b28d5b85260715d9b47b07d7095b9b5985baff4f30ecf63