Malicious PDF — malware analysis report

Static analysis result for SHA-256 2efe31b8f11f5a2f…

MALICIOUS

PDF

68.4 KB Created: 2021-09-24 21:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a4170d0de9170bca61722733c2f2be4f SHA-1: 168e7aff66de3287db95d02cb296be8f61a0b022 SHA-256: 2efe31b8f11f5a2f50b09a48abbd0842c7482fb622bc4f7c0bfbca4f306d5dc2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest the document is designed to redirect users to potentially harmful websites. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://pixomot.ru/uplcv?utm_term=apk+ps4+emulator PDF link annotation
    • http://quaisetoiles.fr/img_pages/file/93885410566.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/bojovamiwabuwu.pdfIn PDF document text
    • http://teraval.cz/res/file/migunuzoferaputoruribek.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/xililovonojug.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/jizufene.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/xelegosetik.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/22431521878.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/zotozuma.pdfIn PDF document text
    • https://orrizon.ru/images/file/29599776418.pdfIn PDF document text
    • http://moristas.com/userfiles/files/81733386209.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/xamulajedufuzowi.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/39151308187.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/jenukudezumarojemeb.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/19091633389.pdfIn PDF document text
    • https://lasanisports.com/files/wugikenibunomum.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/915386d773fe392dea0d0ac2fe53f978/befagitujolevirave.pdfIn PDF document text
    • http://thaymanhinhlaptop.com/userfiles/file/38009403258.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/53950847507.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614d5cab9377b---jixefuliwawozimodurime.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kerafikiba.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/bidesuladir.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/20996710189.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/82282874618.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/muvoxoxapomit.pdfIn PDF document text
    • 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_off0000adf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADF8 10468 bytes
SHA-256: bb4e843a76a34c9f65ff2248cb71dbff7d61b8ec5055588948c915711f3c7da3
font_01_sfnt_off0000c5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E8 15156 bytes
SHA-256: 89218c32b3ada7054071ad16476ab8a2182ea66c2c830ba9103c8386ac3543c8
font_02_sfnt_off0000ec9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1