Malicious PDF — malware analysis report

Static analysis result for SHA-256 26f157c3539b772e…

MALICIOUS

PDF

109.1 KB Created: 2021-09-19 08:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: df7b110373e58ffd4895bb2fbf30b318 SHA-1: 62ba9bfe1441f1e13bec38046c060dc2ce2cea7f SHA-256: 26f157c3539b772efe44001ba158de38dfce6adea93958b387bb0aea619c8033
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download' button heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=manga+reader+android PDF link annotation
    • https://gallerylingard.com/uploads/file/savivukuditom.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/48620828707.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/5521185978.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/mizefuketaxixapod.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/23464453693.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/36800746209.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/40804572507.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161340b58e79a7---92258380072.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/7446992988.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/23433611220.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/nofikerusivepefisa.pdfIn PDF document text
    • https://rotitelor.com/contents/files/gubilivitujaxege.pdfIn PDF document text
    • https://luminex.pl/upload/file/pufupe.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/noxunogufisubamibe.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/55210741100.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/73391714749.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145abb151a60---pukegejitimumor.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/12094200482.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/89180275613.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/94284613948.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/wefudibibewaraj.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/14182970026.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/69591488693.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/nemiji.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_off00014738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F4A 18844 bytes
SHA-256: f2c190ae44798ea2524ac742daa37a95fb0dce488436bc38f3184ea306939e88
font_02_sfnt_off00019105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19105 10104 bytes
SHA-256: ce93e14cfb3a675241e68b6dd4a045627f68593b6576b105b7a2c5aa1408067d