Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee1279872fa04da3…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 08:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5874b7beeeae0ba4f85435fc2a83e3ae SHA-1: 5c35d7d9189ba8dd9defdf0ad9e0ad95dcf6a521 SHA-256: ee1279872fa04da382e4bcf61cc6e16b56b6e1f31198e8f4cd141453b15b5fe9
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many pointing to suspicious PDF files on disposable domains, suggesting a link farm or redirection mechanism. The presence of external URIs and the overall structure strongly indicate an attempt to direct users to malicious content, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://ankurgroups.com/userfiles/file/wumigevowaponixuwapivoj.pdf In PDF document text
    • http://topstec.com/d/files/59342727635.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/gakumegejulufesefu.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/8520286072.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/xifop.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/rafasega.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/jakot.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/lemupigogomazevutajag.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/ferujipuwinigazuzaku.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/42090422451.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/52377734640.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/15967848150.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/tagud.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/29040146903.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/vogab.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/52501210223.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/36925824615.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/rujanu.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/vipisesekadutuxod.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/jezolitixekitexegoxu.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/90903014459.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/78827898722.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/48631990971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=minecraft+potato+recipesPDF 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_off0000dcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC3 17008 bytes
SHA-256: b1a00495d6337d0dbd15d7321c10bf67a67045251c8aa27167510f8dc4a162f8
font_01_sfnt_off00010898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10898 10420 bytes
SHA-256: 1ee4fa52bfe12b5f3aaa8cbff020026778a0474450b56d80143a1bdf83c10ef5
font_02_sfnt_off00012058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12058 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1