Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb5161d9c7c56b9a…

MALICIOUS

PDF

79.4 KB Created: 2021-10-15 21:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: db3d34cf843cc4a999f33c1a79169530 SHA-1: c65ad1bbe29422efc7c73638dfd705c949048d0a SHA-256: eb5161d9c7c56b9aae4ab0a20dfb07903bf9455d9a4ba6b268daf9a2305266e0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with a critical heuristic indicating it's a Pdf.Phishing.Trojan. The presence of embedded JavaScript and numerous external URIs, many pointing to PDF files on unknown domains, strongly suggests a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a pattern of using disposable hosting for a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://velocimapper.com/webfiles/file/tavadaputufota.pdf In PDF document text
    • http://bn-biz.com/userData/board/file/17285492780.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/gefabobu.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/mofuwijexifewufu.pdfIn PDF document text
    • http://htygroup.com/upload/files/62489736715.pdfIn PDF document text
    • http://cartopack.be/Images/file/nukukem.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/58348059545.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/43138636999.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/wegaxolemodoz.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/fibilogi.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/vokebe.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/55717354124.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/jijawa.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/b8ca13015489dbea2775064efb596611/48847683435.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/10912526403.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/zutonuxogufuwamux.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/83487026302.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/53611219777.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/67182887047.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/86277323757.pdfIn PDF document text
    • http://quranday.org/userfiles/file/91654831513.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/xopujomin.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/titukudusuji.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/xadaragolati.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/xPAns0MRe5M/uplcv?utm_term=pair+of+ticketsPDF 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_off0000d491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA8 10272 bytes
SHA-256: a559eee611fe52cd83c7475338e3b86f3215205aaad9f716841d444c3c064e03
font_02_sfnt_off000103f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F7 17532 bytes
SHA-256: e1527c586441c5d4477eb257a745e86c3e1fcd08632caa91930d34a296acdbb0

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